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Old 10-23-2007, 02:53 PM   #106
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hater
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Old 10-24-2007, 09:55 PM   #107
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This was from a couple of weeks ago .
I know it was rich the pass before .
I guess that is when it started


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Old 10-25-2007, 12:06 AM   #108
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Have you considered opening the exhaust valve a little sooner?

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Old 10-25-2007, 10:23 AM   #109
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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..
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Old 10-25-2007, 11:18 AM   #110
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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?
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Old 10-25-2007, 01:07 PM   #111
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What cylinder was that?
#6 and 8has an eye brow lifted by the edge of the intake.
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Old 10-25-2007, 01:14 PM   #112
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#6 and 8has an eye brow lifted by the edge of the intake.
Are they next to each other? And do they fire sequential?
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Old 10-25-2007, 02:45 PM   #113
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it has the same order as a chevy
1,8,4,3,6,5,7,2
6 and 8 are next to each other .
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Old 10-25-2007, 03:14 PM   #114
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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.

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Old 10-25-2007, 04:18 PM   #115
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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 ?
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Old 10-25-2007, 04:30 PM   #116
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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.
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Old 10-25-2007, 05:05 PM   #117
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Too much fuel.
What is your tune up ?? fuel type, plate I assume ??
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Old 10-25-2007, 05:07 PM   #118
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What is your tune up ?? fuel type, plate I assume ??
I'm pretty sure he is running a dry fogger with EFI.
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Old 10-25-2007, 06:57 PM   #119
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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.
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Old 10-30-2007, 04:22 PM   #120
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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

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