Show off your burned pistons..

[Monty Mikho]

http://www.yellowbullet.com/hurt_piston.jpg

[garyj]

monty, just clean it up. It will be fine

[Mark Nealen]

Monty :shock:
Do you know what caused that? Mine look very similar, damaged in the same area. I will try to post pic's later. Was that From being to lean or from detination? to much ignition timing? Just want to learn as much as posable to save parts and $. Must say they make me feel better :-D Im not alone. :-D

Mark

[Zeke1]

Monty your an amatuer at melting slug's what till I post some I garrantee you will fell much much better after I do, problem is I don't think I have enuff room on the camera card to take pictures of ALL OF THEM this could take a while :smt013

[Monty Mikho]

Monty :shock:
Do you know what caused that? Mine look very similar, damaged in the same area. I will try to post pic's later. Was that From being to lean or from detination? to much ignition timing? Just want to learn as much as posable to save parts and $. Must say they make me feel better :-D Im not alone. :-D

Mark

It was due to poor piston design. Removing over 40 grams off the piston was a poor choice. Also the design of these pistons were nowhere near the BME's I had used previous years... I think the material used here was less than perfect for a nitrous application.. I will post another picture of some other pistons. :shock:

[Monty Mikho]

http://www.yellowbullet.net/BPiston.jpg

[Bobalos]

Is that the special "I want to view the top end of my Rods" option? LOL.

Seriously, it looks real thin where I circled it. is it or is that just the angle that the picture was taken?

http://www.gofastzone.com/modules/gallery/albums/album02/BPiston_with_circle.jpg

Bob

[Monty Mikho]

Its actually .250" there.. Its the way it broke I guess..

[Bobalos]

thats Crazy, amigo. I hope I dont have any of those "special collections". I tore up enough stuff when I was a kid with the VeeWee's, the stakes are quite a bit higher now. LOL.

Bob

[Monty Mikho]

Use BME pistons.. you will thank yourself for it..

[HellBent]

Here's what an extra 1lb of fuel psi on the 2nd stage will get you on a stacked set of Big Shot plates.

http://www.gofastzone.com/modules/gallery/albums/album01/MVC_003X.sized.jpg

[matt mcarthur]

if ya'll would just follow the manufacturers guidlines for nitrous use, this could all of been avoided LOL!!! hellbent, just wanted to thank you for the nitrous 101 article... that came at a time(3 years or so ago) when i really needed it. it set me going in the right direction... no burnt slugs yet... 'course i'm not hitting it as hard as you guys (400 shot).

[Zeke1]

if ya'll would just follow the manufacturers guidlines for nitrous use, this could all of been avoided LOL!!! :smt013

Ya show me where it say's how to tune stacked big shot plate's or how to take 2 second's off your time or run 25+ mph faster, the manufactuer set's very safe and rich guide line's that are good for a increase but not how to WIN races for that you trial and error, show me ONE person in the winner's circle that say's they haven't blow up there crap aleast a dozen time's and I'll show ya a liar :smt014

http://www.yellowbullet.net/piston1.jpg

http://www.yellowbullet.net/piston2.jpg

[Jim Monson]

How about pistons with holes punched in them?

http://img.photobucket.com/albums/v619/MrScrote/100_0376.jpg

[matt mcarthur]

[quote]
if ya'll would just follow the manufacturers guidlines for nitrous use, this could all of been avoided LOL!!! :smt013

Ya show me where it say's how to tune stacked big shot plate's or how to take 2 second's off your time or run 25+ mph faster, the manufactuer set's very safe and rich guide line's that are good for a increase but not how to WIN races for that you trial and error, show me ONE person in the winner's circle that say's they haven't blow up there crap aleast a dozen time's and I'll show ya a liar :smt014




did you not think that was a joke... cuz it sure was meant to be one!!! you don't think i know about 2 stacked plates, i also know that nos plate kits are 40% rich from the factory... i was only kidding, i know there is no manufactures guidlines for tuning 2 kits... hell, i've got a pro-race fogger and a big shot plate on mine, so i've been there just haven't hurt anything TOO bad yet, just a couple lifted ring lands.

[Zeke1]

Sorry to jump on ya Matt but it's a LITTLE sore spot right now bad timing I guess next time put a little smiley so I don't go off the deep end :wink:

[Zeke1]

Okay guy's I need some help the picture's that are four post back with the ring land's lifted what's your oppinion on the problem I've been told alot of different thing's and need to figure this out real soon or buy stock in a piston company,

it's a small block chev 400 11.5 to 1 nos cross plate 73/82 on one bar and 82/110 on the second the reson for the big split on the second is I have a BTR .250 orifice solinode on that one and was told to run it richer to compensate for it 7lbs fuel press. 38 degrees timing pulling out 13 degrees VP NO2 FUEL I have had trouble with #6 in the past so I took an additional 2 degree's timing out of the four corners and #6 these piston's have 10 passes on them the first pass was very fat so I went up on the second bar to 91/110 and it ran very clean and faster but had aluminum on the plug but didn't melt the plug had to keep going round's so I went back to the 82/110 and took out 5 degree's instead of 2 out of #6 and it ran fine all day that plug looked good everytime I pulled it , NOW what do you guy's think is it too much timing, Too fat, too lean, ring's aren't butting as fare as I can tell .028, oil in the chamber, I'm sure in time I will figure it out but my wallet might not hold out that long so all oppinion's are appreciated

[Monty Mikho]

Looks too fat to me.. Usually this is caused from a lifted ring land. Then all hell breaks lose.. Im going to guess it probably pinched the ring on the first very rich run... Some oil into the chamber became a lot of oil into the chamber after getting things sorted out. Remember oil in the chamber will cause detonation.. What kind of pistons are those?

[Zeke1]

That's what I was thinking (too rich) but the guy at JE (yes Monty there JE's) said that when it's too rich they go black between the first and second ring land I don't have that is that true?, and when I went back to the first jet setting's but took out 3 MORE degree's out of #6 it didn't have anymore aluminum on it that's what make's me think it might be timing or timing and too rich or all three timing, oil, and too rich but can we agree it's definatly NOT too lean atleast I can get that one off my list I hope, what do ya think Monty come on I can take it.....I think :?

[Zeke1]

did some more looking see if this help's

#1 good #2 good
#3 pinched top #4 lifted top land
and second ring and pinched second ring
#5 pinched top #6 lifted top land
and second ring and pinched second ring
#7 good #8 pinched top ring

now doe's this mean that the intake is bad because it's all of the middle cylinder's or maybe the 2 degree's that I took out of the corner's is maybe where they all should be

[Monty Mikho]

You should always tune to your worst cylinder. A plate you're pretty much stuck with what you have.. If you have timing controls for each cylinder you can try pulling timing out of the lean ones.. If you do not you can try 1 step colder plug for the lean cylinders.. Lifted ring lands are usually caused by rich conditions..

[Zeke1]

What plug's you run Monty and number plug?

[Mark Nealen]

Use BME pistons.. you will thank yourself for it..

Mike
you posted this earlyer.
I looked at there web site and looked at some of there pricing :o Do you know if they sell to any dealers or are they direct with all customers? Just wanted to know if they stick with the posted price only. Looks to me that I would spend $840.00 on pistons $195.00 on pins. Is this in line with what you have spent in the past. I will be building a 4.5" bore bbc nitrous motor :WGAF Also how do you feel about aluminum rods verses steal? Thanks just like to get it right the first time :-D

Mark

[Monty Mikho]

I used NGK R-7651-10 on nitrous.. I think thats the part number for them... I gap them at .025-.030 depending on the amount of nitrous I was spraying..

[8TREEZ]

I think the part # is R5671A-10

Keith

[matt mcarthur]

I think the part # is R5671A-10

Keith

exactly.

[HellBent]

if ya'll would just follow the manufacturers guidlines for nitrous use, this could all of been avoided LOL!!! hellbent, just wanted to thank you for the nitrous 101 article... that came at a time(3 years or so ago) when i really needed it. it set me going in the right direction... no burnt slugs yet... 'course i'm not hitting it as hard as you guys (400 shot).


Your welcome Matt. Glad it helped. Reliable nitrous tuning advice was nearly impossible to come by back when I wrote that. My goal was to save some people the years of grief we went through. And don't fool yourself...spraying 400 reliably is a great accomplishment.

[Monty Mikho]

I think the part # is R5671A-10

Keith

Thanks for the correction.. That part number looks a little better.. :oops: :D

[MEAN_SBC]

A little miscalculation on my part.... :lol: :lol:

http://amarilloracers.com/brant/burnt.jpg

[Jim Monson]

Looks like you need to pull a little more fuel out and add some more timing. :-D

[MEAN_SBC]

Yeah... I'm the killer of the ring land..... :lol:

[Monty Mikho]

:shock: :shock: Damn and we have a winner!! :shock: :shock:

[MEAN_SBC]

I think the part # is R5671A-10

Keith

I'm guessing that's a mega cold plug, right???? How does it compare to the Autolite AR3932???????

[MEAN_SBC]

:shock: :shock: Damn and we have a winner!! :shock: :shock:

Hell yeah, that's a winner....... Had to replace 8 valves, weld the head, and sleeve the block..... Now, it's good to go.... All of them idiots who say rich is safer than lean have never tried sprayin 400 hp worth of nitrous........... :o

I now have the rings gapped wider (.032"), tune the spray with a wideband 02, and switched to a plate + fogger setup... Hoping to run a 9 this weekend..... :supz:

[Monty Mikho]

I will take lean over rich any day of the week. Burned them both ways and lean is a lot less expensive.. .0075" per inch on top ring and same for 2nd +.002"

[Chris Uratchko]

I think the part # is R5671A-10

Keith

I'm guessing that's a mega cold plug, right???? How does it compare to the Autolite AR3932???????


If memory serves a AR3932 is the equivalent of a -9 NGK.... might be a 10, but I'm pretty sure it's 9.

Edit: oops didn't realize this was an old post.

[81Gutlass]

http://upload2.postimage.org/121762/Bad305piston005.jpg (http://upload2.postimage.org/121762/photo_hosting.html)

Not the winner but it's the worst one I have. I guess thats what I get for trying to double my horsepower. :lol:
I've had a couple different explanations as too why this happened what do you guys think

[Maliboost]

Here is a pretty good on line resource for plugs.

www.sparkplugs.com

Kinda hard to remember sometimes though. LOL.

Bob

[Monty Mikho]

Too much fuel..

Fuel gets trapped under the ring..
Fuel explodes on the next firing cycle and lifts ring land..
Ring gets stuck...
Oil rushes in..
Nitrous...gas..oil cause thermal melt down...

Am I close? :?

[steel town]

explanation looks good to me ........piston looks bad .

[81Gutlass]

Ya thats what i've been told by a couple people, but wanted to make sure. Thanks. :D
I didn't spray alot, well compared to you guys, so i'm trying to learn what I can before I really start to give it hell. :-D Seems kind of odd though because everyone I talked to said that Hypereutectic pistons shatter, but this one didn't????
The new engine should be able to take alot more abuse though. :twisted:

[steel town]

how much did you spray it with ??

[81Gutlass]

I was spraying 150hp too it for awhile and ran the time in my sig. Then desided i'd try 250 and thats where that piston came from. So it really wasn't a big deal that I killed it, actually I was kind of trying too. LOL I was hoping to get a good # out of it before it died by stacking two plates and it didn't workout very well.

[steel town]

Hey you should be really happy with an 11.74 out of a 305 that would make a killer sleeper . I believe it was Monty that was talkin on another post on using two systems and how you have to jet them so you can get proper fuel Nitrous mix (mind you it was a fogger system) but you still have to use pills for your plate .Good luck with the next engine .

[81Gutlass]

Thanks.. Yes I was very happy with it. :-D It really surprised alot of people. Although I think a made a few people mad when I told them the engine size, I don't think they believed me. :lol:

[tbird]

I helped Gutlass with the stacked plate system. We flowed both plates at the same time to determine nitrous and fuel ratio. After looking at all the cylinders,my conclusion was shitty fuel distribution caused by the torquer single plane intake we used. The intake runners are fed only at the front and back of the plenum. So I think the sides of the plenum could collect and puddle fuel. Add in the fact that we used 93 octane for the motor and 110 for the kit. 300hp motor with 250 shot giving an average of 101 octane between the fuels. Afterwards we learned we should use same fuel to carb and Nitrous system. Something about fuel dont really mix that well. OH and we only took 6 deg. out for timing if I remeber correct. Might try it again doing somethings different just to prove it would work.

[TRICK_5_0]

Those Torker intakes really do suck!

[Tom McDunnah]

Boo King ran a 7.09 @199 with this piston, can you imagine what it will run with all 8 get her tuned up boys

http://www.bookingracing.ca/DSCN0057.JPG

[gdwrench]

WoW,,,,nice meltdown !!!!

[newdealracing]

ouch....

[Cs19]

Damn thats some thrashed stuff, i hope i never go there.

[Monty Mikho]

Damn thats some thrashed stuff, i hope i never go there.\

Come on now!!! We need pictures!!! :p

[Robert1320]

Do these count?

http://mywebpages.comcast.net/dragrace/pistonhole.jpg

http://mywebpages.comcast.net/dragrace/pistonhole2.jpg

[KIRK ADAMS]

http://i37.photobucket.com/albums/e64/KIRK_ADAMS/piston2.jpg

[Jim Monson]

http://i37.photobucket.com/albums/e64/KIRK_ADAMS/piston2.jpgNice! Is this what Baio means when he says he just "lifted the ring lands"?

[KIRK ADAMS]

:cool:

[money698]

Mess up!!!!!!!!!! http://i37.photobucket.com/albums/e64/KIRK_ADAMS/piston2.jpg

[MCas7]

Well unfortunately for us, our burnt piston cost us a sleeve, camshaft, and some major block welding. I'm really not sure how it gets this bad, but I guess live and learn...

http://1960belair.com/images/piston1.jpg
http://1960belair.com/images/piston2.jpg
http://1960belair.com/images/piston3.jpg

[dizope]

So I've never burned a piston or broke a motor - what does it feel like? Does it just shut off? An explosion? The car get stupid?

I'm sure it's inevitiable as you get faster...

[Monty Mikho]

So I've never burned a piston or broke a motor - what does it feel like? Does it just shut off? An explosion? The car get stupid?

I'm sure it's inevitiable as you get faster...

Yes.. all the above... Sometimes you can feel it.. Sometimes it happened so quick you see a little fire... Sometimes you have no clue.. Sometimes you set a record.. Never know.. all that is proof is the garbage thats left behind.. :p

[dizope]

Yes.. all the above... Sometimes you can feel it.. Sometimes it happened so quick you see a little fire... Sometimes you have no clue.. Sometimes you set a record.. Never know.. all that is proof is the garbage thats left behind.. :p
That's pretty scary... Thanks Monty.

[steve hurt]

So I've never burned a piston or broke a motor - what does it feel like? Does it just shut off? An explosion? The car get stupid?

I'm sure it's inevitiable as you get faster...


And sometimes you notice because things like this happen.......I think this is when he pulled 2nd gear......ouch. This was a piston and sleeve or two....

[KIRK ADAMS]

that bitch was on a run though..!!!!:cool:


Mess up!!!!!!!!!!

[Ed-vancedEngines]

So far my customers have been lucky, so all I have seen or heard about came from other builders.

One well known hired gun nitrous tuner told me about one the other day, that the only sign they had that something was wrong is that the convertor didn't spool flash as much on the launch and the mph was down by 2 mph at the end of the 1/8. The car thjat time was a True 10.5 car. It dropped from 145 mph to 143 mph and the flash on launch dropped by appx 300 rpm. Compression when cranking was a little uneven. So after pulling it down they found three lands that were lifted.

That was no fire, no explosion, no smoke puffs but was still a damaged engine.
Usually you might see a smoke puff from one bank.

By looking at a lot of the piston pics, I can suggest what I have been suggestiong for a long time, but other builders argue. Open the exhaust valve sooner. Increase quench distance & if necessary lower compression a tad. Opening the exhuast valve earlier will help get rid of damaging heat while the cylinder is still making power but the heat is increasing quickly. Pistons and all metal is a heat sink and needs to be cooled before it melts.

Ed

[rodneylenton]

425HP shot stock 454 Hey let'er rip, it was a threesome LOL

http://s130.photobucket.com/albums/p264/lenton5/Car%20Stuff/th_burned2.jpg

http://s130.photobucket.com/albums/p264/lenton5/Car%20Stuff/th_burned1.jpg

http://s130.photobucket.com/albums/p264/lenton5/Car%20Stuff/th_burned8.jpg

Rodney

[NOS-Nelson]

Wow crazy pics guys. Some of those pistons were run 1 pass too many.:p

[Scott Smith]

My friend Bill Trovato would call this "Stepping on yer dyck" :p

http://jbsdragracing.com/v-web/gallery/albums/Misc_Pics/DSCN0943.sized.jpg

http://jbsdragracing.com/v-web/gallery/albums/Misc_Pics/DSCN0942.sized.jpg

http://jbsdragracing.com/v-web/gallery/albums/Misc_Pics/DSCN0941.sized.jpg

http://jbsdragracing.com/v-web/gallery/albums/Misc_Pics/DSCN0940.sized.jpg

[jboehm]

How is this?

[excelerater]

How is this?

thats about the saddest looking thing I ever saw come out of an engine....
I am wondering what the rest of the motor looks like now

[KIRK ADAMS]

How is this?

Thats a good one...!!!

[NOS-Nelson]

My friend Bill Trovato would call this "Stepping on yer dyck" :p

http://jbsdragracing.com/v-web/gallery/albums/Misc_Pics/DSCN0943.sized.jpg

http://jbsdragracing.com/v-web/gallery/albums/Misc_Pics/DSCN0942.sized.jpg

http://jbsdragracing.com/v-web/gallery/albums/Misc_Pics/DSCN0941.sized.jpg

http://jbsdragracing.com/v-web/gallery/albums/Misc_Pics/DSCN0940.sized.jpg

Oooh plunge cut and nitrous. Ouch.:rolleyes:

[388Monte]

Oooh plunge cut and nitrous. Ouch.:rolleyes:

I was thinking the same thing !!!

[NOS-Nelson]

I was thinking the same thing !!!

I know you've heard it too. " Give me MAX compression ".:p

[DHR racecars]

I know you've heard it too. " Give me MAX detonation ".:p

There Mike............................:cool:

[NOS-Nelson]

There Mike............................:cool:

:smt097 I didn't catch that right away Darren.:p

[DHR racecars]

:smt097 I didn't catch that right away Darren.:p


Whats crackin' Mr????

How was lunch???

[NOS-Nelson]

Whats crackin' Mr????

How was lunch???

Just answering questions and killing time.:p

[DHR racecars]

Just answering questions and killing time.:p

So what is your title there?????????????

[NOS-Nelson]

So what is your title there?????????????

Domestic Sales. But mostly the high end custom stuff.:cool:

[DHR racecars]

Domestic Sales. But mostly the high end custom stuff.:cool:


WERD..................:cool:

Need any outside sales guys?????????;)

[dizope]

Oooh plunge cut and nitrous. Ouch.:rolleyes:
I now know what you were talking about yesterday... wow...

[NOS-Nelson]

I now know what you were talking about yesterday... wow...

Exactly. A while back I took all our old pistons and threw them in a milk crate. I grabbed one and showed Lonnie and said " Can you imagine that we used to run these things ".:p

[dizope]

Exactly. A while back I took all our old pistons and threw them in a milk crate. I grabbed one and showed Lonnie and said " Can you imagine that we used to run these things ".:p
Crazy. Did my goods ship yesterday?

[NOS-Nelson]

Crazy. Did my goods ship yesterday?

It's leaving today Richard. The rings just cam in today.:cool:

[dizope]

It's leaving today Richard. The rings just cam in today.:cool:
Sweet, thanks Mike. The block should be here Friday.

[Schfifty Five]

http://www.dragsim.com/uploads/U314-1183011102.jpg

http://www.dragsim.com/uploads/U314-1183011112.jpg

[dizope]

So when a piston decided to leave life, how bad does it hurt the cylinder?

[Peep Show Racing]

A lot of things went wrong here, mainly the fuel pump that ran out of uumph and failed. Hurt the block a bit.. It was on a 434, never again with a 1"CH and that much compression.

[dmc_racing]

A lot of things went wrong here, mainly the fuel pump that ran out of uumph and failed. Hurt the block a bit.. It was on a 434, never again with a 1"CH and that much compression.

Did this happen on the spray? How much nitrous / compresion?

[Tom McDunnah]

A lot of things went wrong here, mainly the fuel pump that ran out of uumph and failed. Hurt the block a bit.. It was on a 434, never again with a 1"CH and that much compression.


This is why you should use a pressure switch on the fuel pressure side,so when the fuel pressure goes below 4 1/2 lbs it shuts the nitrous system off.
This is a pretty expensive lesson for a 10 dollar pressure switch

[Mike Thompson]

This is why you should use a pressure switch on the fuel pressure side,so when the fuel pressure goes below 4 1/2 lbs it shuts the nitrous system off.
This is a pretty expensive lesson for a 10 dollar pressure switch

I always thought this untill I found out how these switches turn on and off from vibration. With the MSD 7531 you can see the step circuit triggering on and off the entire pass. Jump the switch and its smooth on the graph.

[Tom McDunnah]

I always thought this untill I found out how these switches turn on and off from vibration. With the MSD 7531 you can see the step circuit triggering on and off the entire pass. Jump the switch and its smooth on the graph.

Vibration or fuel pressure fluctation?If it matters never mount a regulator solid,that also will give you massive fluctuations in fuel pressure.

[Peep Show Racing]

Thanks for pouring a little salt on the wound.. It was a 15 ish.1 434. Was on a 250 fogger shot, with a fuel pump that checked good in the pits, but would not deliver when it was placed under a load of the motor and fogger. I had a good pump on there, but everything man made will break.

[Dave Bowman]

I find it funny that this is in the n2o section :)

[NOS-Nelson]

I find it funny that this is in the n2o section :)
:smt098 You suck Dave.:p

[fn4ever1]

Oops!! I think it went lean!

[63 Vette]

Oops!! I think it went lean!

I am no expert, but I think you had a timing issue there........what did the plug look like ??

[fn4ever1]

The tip was burnt, This was number 8 cylinder. The car has a msd 7530T box in it with a Wilson single stage plate with 93 jet's. Wilson say's to put a plug wire sync kit on it and pull an extra 3-4 degrees of timing out of it on number 8.

[muddytoy]

too fat you think number from my bbc

[muddytoy]

pic wont upload...

[FuelSupply]

http://i226.photobucket.com/albums/dd47/fuelsupply/DSC02561.jpg

[FuelSupply]

http://i226.photobucket.com/albums/dd47/fuelsupply/DSC00248.jpg

[Steve69SS396]

KB hyper's on spray. My luck finally ran out! At least it didn't damage much. :-D

http://img.photobucket.com/albums/v325/steve69ss396/IMG_0008.jpg
http://img.photobucket.com/albums/v325/steve69ss396/IMG_0007C.jpg

[NOS-Nelson]

Ouch Dave ouch.:rolleyes:



Oh yeah i'm a mod here Dave.

[Dave Bowman]

hater :D

[NOS-Nelson]

hater :D

Yes you are Dave.:p

[RADAMX]

This was from a couple of weeks ago .
I know it was rich the pass before .
I guess that is when it started

http://memimage.cardomain.net/member_images/11/web/671000-671999/671473_71_full.jpg
http://memimage.cardomain.net/member_images/11/web/671000-671999/671473_70_full.jpg

[Ed-vancedEngines]

Have you considered opening the exhaust valve a little sooner?

Ed

[RADAMX]

I have ......
Do you have access to AMC bilits ?
this is a new tune up with just a couple of runs . I had some problems with not enough flow through the nitrous solenoid. so it was pig fat rich for about 6 runs . this is the only one that went away . it showed a sign on the plug the pass before .
i just didn't know what the plug was telling me...
I had been running a 400 hp tune for a couple of years this was stepped up to 550 hp . I have the flow issue fixed so now is time to work on this tune up..

[NOS-Nelson]

I have ......
Do you have access to AMC bilits ?
this is a new tune up with just a couple of runs . I had some problems with not enough flow through the nitrous solenoid. so it was pig fat rich for about 6 runs . this is the only one that went away . it showed a sign on the plug the pass before .
i just didn't know what the plug was telling me...
I had been running a 400 hp tune for a couple of years this was stepped up to 550 hp . I have the flow issue fixed so now is time to work on this tune up..

What cylinder was that?

[RADAMX]

What cylinder was that?
#6 and 8has an eye brow lifted by the edge of the intake.

[NOS-Nelson]

#6 and 8has an eye brow lifted by the edge of the intake.

Are they next to each other? And do they fire sequential?

[RADAMX]

it has the same order as a chevy
1,8,4,3,6,5,7,2
6 and 8 are next to each other .

[Ed-vancedEngines]

What kind of Intake Manifold are you using? IF this is only two cylinders and the rest look good, It could be a heat build up (As Nelson was suggesting) or a fuel distribution problem. Maybe.

The reason I asked about the exhaust opening is becuase to me it looked like a severe heat soak instead of a tunning error.

LSM Does custom make cores for cams they gring. Don't know if they would be able to make one for yours. I can't see why not. Crower custom makes cores and Cam Motion makes cores.

At the sacrifice of additional cranking compression you can farter advance your cam some to open the exhaust valves earlier if it does turn out to be heat soak by inspecting all the other pistons and even if not damaged check to see if they show signs of extreme heat in the crown and on the sides of the crown. Rings will likely show a distortion tooo or lack of tension.

If you were to advance cam more making more cranking compression and more cylinder pressure BTDC you can compensate by using a thicker head gasket and reducing compression and increasing quench/squish clearance which will lower cranking compression and normal cylinder pressure BTDC. When nitrous separates into nitrogen and oxygen at appx 550 to 575 deg F you will have tons of cylinder pressure.

For what it is worth I have guys with conventional head 23 deg SB Chevys spraying 600 to 700 shot and living with my SB N2o Pistons made for me by BRC. To be fair though, those are in Mud Racers.

Ed

[RADAMX]

Ok I pulled the rest of the pistons
# 1,2,3,6,7,8 all lifted the top ring lans
# 1,2,4,6,7,8, had the top ring stuck.
# 1,2,3,4,6,8 had the 2nd ring stuck.
None show heat on the bottom piston.
Ok now what do you think ?

[NOS-Nelson]

Ok I pulled the rest of the pistons
# 1,2,3,6,7,8 all lifted the top ring lans
# 1,2,4,6,7,8, had the top ring stuck.
# 1,2,3,4,6,8 had the 2nd ring stuck.
None show heat on the bottom piston.
Ok now what do you think ?

Too much fuel.

[63 Vette]

Too much fuel.

What is your tune up ?? fuel type, plate I assume ??

[NOS-Nelson]

What is your tune up ?? fuel type, plate I assume ??

I'm pretty sure he is running a dry fogger with EFI.

[RADAMX]

dry fogger 2 stage 200 1st stage 350 2nd -B nossle
VP NOS fuel
Like I said I had a problem with the N2O solenoid not flowing enough and it was running really rich untill I figured it out .I guess a little 2 late .
I had 4 spare pistons so I ordered 4 more . then try it again.

[mhancock]

Here's one that didn't really burn but it is still pretty phucked up. It did a lot of damage to other parts too as I am sure you can tell. I am not sure who's car it came out of. This was just laying around at a friend's shop and I thought about this thread so I snapped a picture with my phone. The valve was actually attached to the piston but someone pulled it out before I could take the picture. It looked weird seeing them as one piece...lol

http://i142.photobucket.com/albums/r117/marshallhancock/cid__1030071420a.jpg

[78superbu]

What do you guys think caused this. I am pretty sure it was too much fuel but I am no expert. Or was this a timing issue. The piston is out of a 565 with a fogger jetted 32n 28f. I was flowing my fuel thru a .073 nitrous jet at 7 psi. Total timing was on 28 degrees with Torco 118 nos fuel. After this happened I compared my flow tool fuel psi gauge to a friends that is supposed to be very accurate. We found that while my gauge read 7 psi his would read around 10 psi. Just curious as to what everyone else thinks.http://img440.imageshack.us/img440/8748/liftedringlandzg1.jpg (http://imageshack.us)

[NOS-Nelson]

What do you guys think caused this. I am pretty sure it was too much fuel but I am no expert. Or was this a timing issue. The piston is out of a 565 with a fogger jetted 32n 28f. I was flowing my fuel thru a .073 nitrous jet at 7 psi. Total timing was on 28 degrees with Torco 118 nos fuel. After this happened I compared my flow tool fuel psi gauge to a friends that is supposed to be very accurate. We found that while my gauge read 7 psi his would read around 10 psi. Just curious as to what everyone else thinks.http://img440.imageshack.us/img440/8748/liftedringlandzg1.jpg (http://imageshack.us)

Intake side yes it is too much fuel.

[Tom McDunnah]

What kind of rings are they?
What was the rings gapped at?

[Robert56]

http://www.fquick.com/images/vehicles/full/206333149.jpg?1175222849

[Robert56]

That was a dry 285rwhp shot on a stock LS6; hypercraptic pistons and to much timing. Not sure where the pic went, I guess mod has to see it first?
Robert

[78superbu]

What kind of rings are they?
What was the rings gapped at?
They are Speed Pro plasma moly rings. Gapped at .032 top and .028 2nd if I remember correctly.

[NOS-Nelson]

They are Speed Pro plasma moly rings. Gapped at .032 top and .028 2nd if I remember correctly.

Two things. Too little end gap and do not use moly rings in a nitrous engine. Use a ductile iron Hellfire upper and a cast 2nd ring.

[Mike Thompson]

Any opinions on this one????

http://img.photobucket.com/albums/v231/mikethompson/piston1.jpg
http://img.photobucket.com/albums/v231/mikethompson/piston2.jpg
http://img.photobucket.com/albums/v231/mikethompson/piston3.jpg

[NOS-Nelson]

Any opinions on this one????

http://img.photobucket.com/albums/v231/mikethompson/piston1.jpg
http://img.photobucket.com/albums/v231/mikethompson/piston2.jpg
http://img.photobucket.com/albums/v231/mikethompson/piston3.jpg

I see allot of heat in the quench pad. You can see detonation near the intake side but that may be after the ring seal was gone. Check one of the good pistons and measure the skirt to check for collapse and the integrity of the ring lands.

[Monty Mikho]

I never had much luck with lateral gas ports. The rings would always show some burning at them points. Just what I had experienced with my junk..

[Monty Mikho]

Also was the piston to wall on this piston correct? Man it shows a lot of rocking on top and bottom...

[NOS-Nelson]

I never had much luck with lateral gas ports. The rings would always show some burning at them points. Just what I had experienced with my junk..

And i've never had a problem with them. I'm almost scared to build a piston without them. One of the other benifits is the lateral clearance on the ring is reduced which increases ring stability. It's probably splitting hairs at that point though.:cool:

[elky406]

So I've never burned a piston or broke a motor - what does it feel like? Does it just shut off? An explosion? The car get stupid?

I'm sure it's inevitiable as you get faster...
when i broke the rod in the 406 it layed over and missed real bad,tons of smoke.But still ran as i drove it up on the trailor,broken rod and all.

[farrigno]

lets play a game called WTF HAPPENED! hers some pics tell me what ya think, heres a hint....nos ....300 shot.....nitrous, its like russian roulette the shit is evil!

[Zeke1]

Too lean probably started with the sharp edge where the two eyebrowes meet and started melting, just a guess :smt102

[farrigno]

mt thought was a timing issue, as soon as my computer decides to let me, ill upload another pic of the ring land,valve relief area melted.

[farrigno]

hey my computer let me up load today can anybody comment on this gem?

[dizope]

when i broke the rod in the 406 it layed over and missed real bad,tons of smoke.But still ran as i drove it up on the trailor,broken rod and all.
Yah, you got lucky!

[NOS-Nelson]

hey my computer let me up load today can anybody comment on this gem?

Intake pocket. Too rich.

[farrigno]

actually nelson i just checked my records and that happened from a piece of tef tape stuck in the fuel jet:mad: i hate when that happens but the other ones look the same and i know they were too rich....and believe me i have many ashtrays.

[Tom McDunnah]

Also was the piston to wall on this piston correct? Man it shows a lot of rocking on top and bottom...


That usually happens when the ring gaps are too tight and butt together

[NOS-Nelson]

actually nelson i just checked my records and that happened from a piece of tef tape stuck in the fuel jet:mad: i hate when that happens but the other ones look the same and i know they were too rich....and believe me i have many ashtrays.

Did that happen on a single run or had the engine been run prior. Most guys lift lands on the very first pass. Then after they start leaning it out it torches through.

My bad you meant the one with the hole in the center.

[Scotty]

http://memimage.cardomain.net/member_images/2/web/2450000-2450999/2450004_30_full.jpg

[farrigno]

Did that happen on a single run or had the engine been run prior. Most guys lift lands on the very first pass. Then after they start leaning it out it torches through.

My bad you meant the one with the hole in the center. nelson,the one with the hole knocked through the center was i believe a timing issue?, the one with the land burnt through was from a clogged fuel jet if ya could believe that.the ones with the burnt lands [pocket area] probably did happen on the first run, then after 3-4 passes ouch!maybe this goes against the grain of what you see?...but hell you have tuned a lot more nos motors than me, i cant even tune my own junk!

[Miniracer1992]

What would cause this?
Car laid over at 1000ft and still went 9.15@149.
Nelson, This is from the '66 Vette at the PSCA Season Opener when we blew up the motor on Saturday morning, Drove home changed motors came back and went to the finals :rolleyes:
http://i86.photobucket.com/albums/k87/motivational/100_0558-1.jpg

[NOS-Nelson]

What would cause this?
Car laid over at 1000ft and still went 9.15@149.
Nelson, This is from the '66 Vette at the PSCA Season Opener when we blew up the motor on Saturday morning, Drove home changed motors came back and went to the finals :rolleyes:
http://i86.photobucket.com/albums/k87/motivational/100_0558-1.jpg

Laying over is generally going rich. Plus being limited to a 10 lb bottle doesn't help. Ryan does Gramps run a vacuum pump on his engine?

[Scotty]

The crown

http://memimage.cardomain.net/member_images/2/web/2450000-2450999/2450004_46_full.jpg

[Scotty]

http://memimage.cardomain.net/member_images/2/web/2450000-2450999/2450004_48_full.jpg

[Scotty]

http://memimage.cardomain.net/member_images/2/web/2450000-2450999/2450004_49_full.jpg

[fn4ever1]

More Ashtray's for the bench!

[Spooleliminator]

More Ashtray's for the bench!

ouch, how much were u spraying?

[fn4ever1]

98 square on a Wilson plate, off the top of my head I think it's 305hp. That was cylinder number 2 pulling an additional 2 degrees out of that hole. We showed the plugs from the previous run to three different people at the track who run nitrous. They said they would kill to have plug's that looked the way that they did, and to leave the tune up alone, so we did. Then the next pass this happend. Live and Learn! LOL!

[Standtrue]

So it seems from all the pics that a comon Nos problem seems to be running too rich as a baseline resulting in lifting the ring lands which then lets oil up past the rings which then helps blow holes in pistons from detonation???

[fatwax]

not burned and not from nos but a piston problem i thought i'd share. http://i129.photobucket.com/albums/p237/fatwax/misc/IMAG0007.jpg

[slowstang]

carnage pics are always fun to look at .when they are yours you show them off to your friends like proud parents:rolleyes::rolleyes::rolleyes:

[nitrousdave]

Ok guys what do you think of these:

I'm pretty sure the lifted lands are from being too rich, but what do you make of the one that looks like it had something flying around in the chamber?

[nitrousdave]

Here's some more:

[1fstlx]

Too much fuel and timing!!

[true11]

1fstlx when are you go back to sac raceway

[1bad442]

http://i52.photobucket.com/albums/g21/outlaw7d9/DSC01469.jpg

[farrigno]

what happened?? too much timing?:smt102

[1bad442]

what happened?? too much timing?:smt102

pedaled the car about 12 times in 1 weekend and the step off delay on the 7531 box was set at zero . oh well my mistake live and learn i guess

[Jim Brown]

Here are a coupleof my pistons from this past year.:smt088

[quickwrench]

Here are a coupleof my pistons from this past year.:smt088
Aye carumba!!!

[Jim Brown]

Aye carumba!!!

Unfortunately, I have a WHOLE LOT MORE of those, along with new sleeves, and some welded cylinder heads.

[Jim Brown]

Heres some more...

[mhancock]

Here are a coupleof my pistons from this past year.:smt088

OUCH!!!

[farrigno]

Heres some more... aint power adders fun?!? what do you think happened, just curious.

[Jim Brown]

Too much fuel.

[Monty Mikho]

Is it possible you blew a head gasket? I see a crack between the two cylinders on the head.

[Jim Monson]

Jim, I think you should add some nitrous jet and bump the timing up a few degrees. :-KFCD :-D

[Jim Brown]

Jim, I think you should add some nitrous jet and bump the timing up a few degrees. :-KFCD :-D
Tried that. Same damn result.:smt023

Monte, the picture of the cylinder head was a blown headgasket. I tore up LOTS of stuff this year.

[Jim Monson]

Monty, I went by Jim's pit at the NMRA Finals in Bowling Green. The scene there gave me flashbacks of the NSCA Super Mod days. Carnage everywhere but the guy would not quit. You have to be impressed with the times he has run with that combination. Mine always ran it's best times on a mix of race fuel, nitrous, and aluminum. :rolleyes:

I need to go polish my turbo now. :cool:

[Jim Brown]

Thanks Gumby. I'll be there this year again with the bottles full and a few more cubes under the scoop.:-D

[vincenos]

Here are a coupleof my pistons from this past year.:smt088
just wondering ...like that didnt happen in 1 pass ?:rolleyes:

[Jim Brown]

Happened in 1 pass. What can I say, I'm that good.:cool:

[vincenos]

Happened in 1 pass. What can I say, I'm that good.:cool:
its not funny but im laughing myass off sorry but did it charge like a raped aped or just kinda pooch down thw track?

[Jim Brown]

Not bad but a long way from where I needed to be. 1.14 60', 4.90 1/8, and 7.73 1/4 in a 2700 10.5 small block with a glide.

[Voluster]

Man some of them pics are ugly

[Jim Brown]

I figured if your gonna do something, do it right.:cool:

[MCas7]

Damnit.....
http://www.computermagiconline.com/yabbse/index.php/action,dlattach/topic,6194.0/attach,14739/image.html

[moneypit]

Is the guessing game still going on?
http://inlinethumb23.webshots.com/4886/2380771670101201698S425x425Q85.jpg
http://inlinethumb34.webshots.com/43745/2179692550101201698S425x425Q85.jpg

[MCas7]

Yup, as long as there is nitrous, there will be crap like this...

http://i268.photobucket.com/albums/jj33/nedannouncer/IMG_0100.jpg

http://i268.photobucket.com/albums/jj33/nedannouncer/IMG_0085.jpg

[Zeke1]

Did it lift the top ring lands on any others? I dought that happened in just one run, how many cylinders did it do it too? what cylinder? what engine and heads?

[MCas7]

It was kind of a freak thing. The #8 intake rocker stand broke one of the bolts that holds it down. This in turn let the pushrod go and closed the intake valve for that cylinder. The piston in the pictures above it #6. When the #8 intake valve closed, the nitrous/fuel had no place else to go except back up and into #6, effectively feeding it 2 cylinders worth of shit. It could have been much worse.

#6 was the only one with damage.

706 BBC

big chief heads.

[excelerater]

http://img.photobucket.com/albums/v328/excelerater/Malibu/PIC_0122.jpg

http://img.photobucket.com/albums/v328/excelerater/Malibu/PIC_0123.jpg
http://img.photobucket.com/albums/v328/excelerater/Malibu/PIC_0124.jpg

[Boweevil]

Damn Mitch. I knew from the oily, strapless plug it was going to be ugly but damn! How did the other slugs look? No more lifted rings I hope.

[excelerater]

Damn Mitch. I knew from the oily, strapless plug it was going to be ugly but damn! How did the other slugs look? No more lifted rings I hope.


I have 5 MAYBE that are reusable if I choose to go that route,lookin over part numbers it would seem my engine builder supplied me with
pistons for NA and not N20.....:confused:
1 rod covered with molton aluminum - dunno if thats fixable.
& 1 nasty looking chamber thats gonna need welding plus ill need a sleeve......

:-damnit

The good news is the lifters,rockers and bearings all look normal
Imma stick to 8th mile from now on....

[Boweevil]

I have 5 MAYBE that are reusable if I choose to go that route
1 rod covered with molton aluminum - dunno if thats fixable.
& 1 nasty looking chamber thats gonna need welding plus ill need a sleeve......

:-damnit

The good news is the lifters,rockers and bearings all look normal
Imma stick to 8th mile from now on....

Great time for a new set of rods/pistons. Freshen her up. And I hear you on the 1/8th mile.

[excelerater]

Great time for a new set of rods/pistons. Freshen her up. And I hear you on the 1/8th mile.


Need mo money hoss

[outlawstang]

awwwww shit you got the money hoss

[OnABudget]

That part number is a JE nitrous series.And you better take fuel out of that tune-up.

[excelerater]

That part number is a JE nitrous series.And you better take fuel out of that tune-up.

JB call me later........It wasent as fat as you would think(that pass)...ill give ya the lowdown fella

[excelerater]

awwwww shit you got the money hoss


Need some paint jobs hoss- hook a brutha up

[outlawstang]

will do.......

[78trojans]

http://i34.tinypic.com/2s6lx7q.jpg

[78trojans]

<a href="http://tinypic.com" target="_blank"><img src="http://i34.tinypic.com/2s6lx7q.jpg" border="0" alt="Image and video hosting by TinyPic"></a>

[78trojans]

http://i34.tinypic.com/2s6lx7q.jpg

[9sec_5.0]

damn you melted that bitch

[gimmemud]

http://i251.photobucket.com/albums/gg307/gimmemud/piston2-1.jpg

http://i251.photobucket.com/albums/gg307/gimmemud/piston1.jpg

[Ed-vancedEngines]

Randy,
You trying to ruin my piston's reputation with that funk tune? ROFL :D

Your new replacements should be done in a few days.

Ed

[gimmemud]

Randy,
You trying to ruin my piston's reputation with that funk tune? ROFL :D

Your new replacements should be done in a few days.

Ed


Ed, I have been tyrying to destroy those pistons all season, those were by far the best I have ever owned.

[John Phillips]

Was that from too much timing?I have a few that look just like those and a few guys have told me it was from too much fuel.If it was too much fuel wouldnt it bend the ring up also?The plugs were on the rich side.The piston showed detonation on it though.It happend in the cool air and didnt pull any timing out.

[gimmemud]

Yes it appears that was the case, the DA from the pass that killed those pistons was 400ft below sea level. I should have pulled alot more timing.:rolleyes:

[grayghost1987]

look like it gotta little hot

[BIGMAC1971]

Result of running a PCV valve to the back of the carb
http://i125.photobucket.com/albums/p50/BIGMAC1971/DSC01198.jpg

[jester]

Result of running a PCV valve to the back of the carb
http://i125.photobucket.com/albums/p50/BIGMAC1971/DSC01198.jpg

How did you conclude that the pcv is what caused this disaster? What happened?
thx

[Mike Thompson]

Good question. The pecker valve shouldn't have a effect at WOT. Unless something else made it pull oil out of the crank case while running down the track.

[BIGMAC1971]

How did you conclude that the pcv is what caused this disaster? What happened?
thx
Thats what the engine builder thought was causing it to burn #8. I was asking about vacuum pumps and he asked what i was using. I said a pcv valve. He asked where it was hooked up i said the back of the carb. His conclusion was it was sucking oil towards that cylinder could have been from driving the car to staging or idling in the lanes.That was #8 piston same thing happened to a previous motor just not as bad. If it sucks oil into that cylinder mixing with the nitrous bad things happen.

[BadAssGN]

Jesus. don't miss melting pistons at all.

Been there done that. ran a Nirtus sbc for years.

Now I'm in a turbo car and not looking back...:)

have any of you considered piston squirters to cool those slugs down??

[G-Code]

You guys have hurt some shit. I tell everyone new to Nitrous: It's like sex in a bottle, it will curl your toes, but there are two types of Nos user's, those who have blown up shit and those who will. ;)

From the old days, before I got the distribution correct by having the spray bar installed in the plenum. ( John Stewart- Top Gun Nos) about 15 yrs ago. 200-350hp Plenum spray bar system with methanol enrichment fuel.

After putting the spray bar in the plenum haven't burnt a piston since:

http://i201.photobucket.com/albums/aa150/Sleepercp/Engine%20stuff/134.jpg

Not Nitrous caused but my friend John from Montana has the record for a hurt engine: 8,600 in the lights with a stock 5.0 bottom end soild roller with Victor heads: the heads were fine because eveything went out the bottom:

http://i201.photobucket.com/albums/aa150/Sleepercp/Engine%20stuff/Lewtons302afterRevtestlores.jpg

G-Code

Big Inch Ford Lover

[WardRacing408]

Not Nitrous caused but my friend John from Montana has the record for a hurt engine: 8,600 in the lights with a stock 5.0 bottom end soild roller with Victor heads: the heads were fine because eveything went out the bottom:

http://i201.photobucket.com/albums/aa150/Sleepercp/Engine%20stuff/Lewtons302afterRevtestlores.jpg

G-Code

Big Inch Ford Lover

:-Daw That is Awesome!!!!...lmao

[nastynotch347]

Now that's background material!

[jake2582]

Now that's background material!
damn i didnt see the cammer in the background till you said that!

[noscoupe]

http://i601.photobucket.com/albums/tt92/noscoupe/pistons001.jpg
http://i601.photobucket.com/albums/tt92/noscoupe/pistons002.jpg
http://i601.photobucket.com/albums/tt92/noscoupe/pistons002.jpg

[mastiff]

http://i445.photobucket.com/albums/qq174/low1100/0712091800.jpg

[Induction-Solutions]

http://i601.photobucket.com/albums/tt92/noscoupe/pistons001.jpg
http://i601.photobucket.com/albums/tt92/noscoupe/pistons002.jpg
http://i601.photobucket.com/albums/tt92/noscoupe/pistons002.jpg


Looking a little lean and or overtimed !!! ;) SJ

[Induction-Solutions]

http://i445.photobucket.com/albums/qq174/low1100/0712091800.jpg



What were the tune up details here ??? SJ

[mastiff]

happened this weekend, 364, 13:1, 175 shot, 36* timing , pulling out 5 on a digital 7. plate setup, the next cylinder over had a dent in the top also. when i leak down tested 2 the exhaust valve was stuck open. and it popped shut. so i im not sure if the valves were sticking and hitting? any thoughts?

[noscoupe]

Looking a little lean and or overtimed !!! ;) SJbigshot plate 82n-91f@5.5 pulled 8 from 36*
I had 4 pistons total with lifted ring lands.This one was the most damage,obviously from oil in the chamber.

[WRIGHTRACING]

yes this tends to happen on sbf and plates. can be done by sj at ind. sol. but they're tricky out the box.

[Eric David Bru]

Looking a little lean and or overtimed !!! ;) SJ

Ugly either way!

[gimmemud]

bigshot plate 82n-91f@5.5 pulled 8 from 36*
I had 4 pistons total with lifted ring lands.This one was the most damage,obviously from oil in the chamber.


Looks like too much timing. Should be down around 22-24* or so with those jets.

[orgjce]

tell us abouy the sohc and the hemi in the background!

[Mark O'Neal]

This whole thread makes me shiver......:-D

[Mark O'Neal]

Yup, as long as there is nitrous, there will be crap like this...

http://i268.photobucket.com/albums/jj33/nedannouncer/IMG_0100.jpg

http://i268.photobucket.com/albums/jj33/nedannouncer/IMG_0085.jpg


"Nitrous Oxide is the best thing that ever happened to piston manufacturers." - Moe Mills (Ross Racing Pistons)

[KellyBlackGT]

http://i653.photobucket.com/albums/uu258/mmeiser/kellyspiston.jpg
Heres mine from this past weekend didnt pull enough timing:-damnit

[565edge]

How much did you throw to it and how much timing did you take out?

[KellyBlackGT]

How much did you throw to it and how much timing did you take out?
only 350 and 15 out it went down track at 19*:smt089

[pt race engines]

http://i653.photobucket.com/albums/uu258/mmeiser/kellyspiston.jpg
Heres mine from this past weekend didnt pull enough timing:-damnitthat top ring looks a lil high to me........ david

[KellyBlackGT]

that top ring looks a lil high to me........ david
Probably is when i bought the pistons I wasn't planning on alot of nitrous:rolleyes:

[ELIMN8U]

http://i653.photobucket.com/albums/uu258/mmeiser/kellyspiston.jpg
Heres mine from this past weekend didnt pull enough timing:-damnit

Dude...that's gonna leave a mark!!!!!

[MCas7]

#6 takes another crap. This time it took the sleeve with it.

http://1960belair.com/images/IMG_5249.jpg

http://1960belair.com/images/IMG_5251.jpg

[Induction-Solutions]

WOW !!! I don't think I've ever seen a sleeve get ate up like that !!! SJ

[marc1166]

X2!! You HAD to feel that one lay over!

[WardRacing408]

Holy Shit!!

Care to share combination and tuneup details on that one MCas7??

[gimmemud]

#6 takes another crap. This time it took the sleeve with it.

http://1960belair.com/images/IMG_5249.jpg

http://1960belair.com/images/IMG_5251.jpg


Good God Gertie what a Gash!!!!!!!


Tune up info????

[ELIMN8U]

OK...I'm back to NOT installing my nitrous kit again!!!!!!!!

[MCas7]

X2!! You HAD to feel that one lay over!

yes, as soon as I felt it, I let out, but obviously the damage was done.

[MCas7]

Oddly enough, the cause of this whole thing really wasn't a bad tune-up. We burnt a pushrod which then allowed the lash cap to pop off the top of the valve. After the cap popped off, the pushrod fell out of place, closing the intake valve and forcing all of #8's mixture into #6 and causing what you see here.

The tune itself was pretty safe:

1st stage - 22F 26N -7 degrees
2nd stage - 32F 36N -7 degrees

5.5 psi fuel pressure on both.

[gimmemud]

Oddly enough, the cause of this whole thing really wasn't a bad tune-up. We burnt a pushrod which then allowed the lash cap to pop off the top of the valve. After the cap popped off, the pushrod fell out of place, closing the intake valve and forcing all of #8's mixture into #6 and causing what you see here.

The tune itself was pretty safe:

1st stage - 22F 26N -7 degrees
2nd stage - 32F 36N -7 degrees

5.5 psi fuel pressure on both.


That could be possible, but not very likely. The chain of evenys just dont add up, (1)if it were 2 cylinders that fire one after the other, but not #8 and #6. (2) a pushrod being burnt doesnt make a lash cap come off.(3) There is nothing safe about that tuneup.IMO Unless you are running 24* initial timing thats not near enough retard for those jets.

The most likely chain of events is the piston was damaged, allowing oil into the chamber, piston deformed from the heat which let the piston hit the valve, which knocked off the lash cap and burnt the push rod.

[MCas7]

That could be possible, but not very likely. The chain of evenys just dont add up, (1)if it were 2 cylinders that fire one after the other, but not #8 and #6. (2) a pushrod being burnt doesnt make a lash cap come off.(3) There is nothing safe about that tuneup.IMO Unless you are running 24* initial timing thats not near enough retard for those jets.

The most likely chain of events is the piston was damaged, allowing oil into the chamber, piston deformed from the heat which let the piston hit the valve, which knocked off the lash cap and burnt the push rod.

Well when the pushrod burnt, it kind of got shorter which threw off the geometry allowing slop in that rocker which in turn could have allowed the cap to pop off which would have created even more slop in that rocker allowing the pushrod to fall out of place. There was no indication of the piston hitting the valve at all. I definitely agree about the piston possibly being damaged before hand but I'm not sure I agree with the rest of that chain of events.

[MCas7]

That could be possible, but not very likely. The chain of evenys just dont add up, (1)if it were 2 cylinders that fire one after the other, but not #8 and #6. (2) a pushrod being burnt doesnt make a lash cap come off.(3) There is nothing safe about that tuneup.IMO Unless you are running 24* initial timing thats not near enough retard for those jets.

The most likely chain of events is the piston was damaged, allowing oil into the chamber, piston deformed from the heat which let the piston hit the valve, which knocked off the lash cap and burnt the push rod.

In your opinion, is this tune-up ok or are we pushing the envelope? Wouldn't you need to know more about the whole combo before saying that it isn't safe?

[gimmemud]

In your opinion, is this tune-up ok or are we pushing the envelope? Wouldn't you need to know more about the whole combo before saying that it isn't safe?


Yeah thats what I was trying to say, I dont have the details on the combo, but it would have to be slouch to need that much timing. I always assume that anyone running that much nitrous has a purpose built nitrous engine with an efficient chamber.

The jet spreads and fuel pressures are not what I would consider way out of line, the timing is what threw up a red flag with me.

I run a similar amount of nitrous (36n on one and 32n on the 2nd) and I pull more timing on 1 kit than you are pulling combined.

I am not an expert by far, just someone who has burnt up a bunch of shit and learned from my mistakes, thousands of dollars later!!;)

[MCas7]

Interesting....

I'll start my own thread for this so I don't clog this one up. I'm curious as to other opinions on this. Thanks for the input though, we're still learning this game and it's nice to have feedback.

[Induction-Solutions]

Oddly enough, the cause of this whole thing really wasn't a bad tune-up. We burnt a pushrod which then allowed the lash cap to pop off the top of the valve. After the cap popped off, the pushrod fell out of place, closing the intake valve and forcing all of #8's mixture into #6 and causing what you see here.

The tune itself was pretty safe:

1st stage - 22F 26N -7 degrees
2nd stage - 32F 36N -7 degrees

5.5 psi fuel pressure on both.



I have seen this exact situation many times over the years... Enough so that if I see a guy burn an engine up real bad out of no where, it's one of the first things I suggest them to check, the roockers and pushrods... Anytime you stop opening up an intake valve the load will back up in the runner and spill over into the cylinder next to it or right across from it..... Been there, seen that !!! ;) Hope this helps.. Steve

[Collinsautomotive]

is that a Mahle power pack piston ? If so my advice would be to get ahold of steve and have him flow your system. Looks a bit heavy on fuel and those piston really don't tolerate that very much.


http://i653.photobucket.com/albums/uu258/mmeiser/kellyspiston.jpg
Heres mine from this past weekend didnt pull enough timing:-damnit

[regalman85]

Oddly enough, the cause of this whole thing really wasn't a bad tune-up. We burnt a pushrod which then allowed the lash cap to pop off the top of the valve. After the cap popped off, the pushrod fell out of place, closing the intake valve and forcing all of #8's mixture into #6 and causing what you see here.

The tune itself was pretty safe:

1st stage - 22F 26N -7 degrees
2nd stage - 32F 36N -7 degrees

5.5 psi fuel pressure on both.



Don't mean to hijack but I have lash caps on my new big block! I have had a lot of people tell me to do away with them! That they cause problems and damage motors!! Do a lot of u guys run them and trust them? Or should I follow advice I have been given to me and get them off my motor?

[Induction-Solutions]

Don't mean to hijack but I have lash caps on my new big block! I have had a lot of people tell me to do away with them! That they cause problems and damage motors!! Do a lot of u guys run them and trust them? Or should I follow advice I have been given to me and get them off my motor?


This would be best posted in it's own thread, not in the burned piston thread ??? Thanks, SJ

[john burdine]

#6 takes another crap. This time it took the sleeve with it.

http://1960belair.com/images/IMG_5249.jpg

http://1960belair.com/images/IMG_5251.jpg

just touch-up hone the block and new rings, you'll be good to go.