C-16, NO2 or C-23(+)

[mrhockey]

I am running a 421 SBC with SB2.2 heads with 40cc chambers. My compression ratio is 13.6:1 and have always run C-16. I have had the usual lifted ring lands a couple of times, some detonation caused by some wayward oil and was told that maybe due to the timing sensitivity of these heads maybe I should step up for some added protection. I am running 2 foggers and am still working on stepping up but a 28 jet in one and a 34 in another is not out of the question. I am running about 3* total timing when both systems are on. Should I stick with the C-16 or step up to the C-23 or NO2 fuel?

[mrhockey]

Anyone?

[steve hurt]

I don't run small block stuff but I have run close to that area of tune-up with 15.1 comp. in a BBC 14 degree motor without issue on C-23. IMO C-23 or C-23+ is the best for anti-detonation when you are stepping on it.....

[Pooch565]

I would go with the C23. Especially if you plan on spraying more in the future. Yeah it's a bit more than the NO2, but I belive you will be happier. Plus the C23 will give you a little room to miss the tune up. Especially with 2 foggers. If you have any other questions, feel free to call or send a message. 812 466 1175.

Thanks,
Jason

[mrhockey]

Thanks Jason.

[mrhockey]

One more question Jason.............I was told the shelf life of this stuff is very short even if it is in the drum with the cap back on it. What is the truth. The guy at the speed shop only buys it in 5 gallon pails for his own use because of this.

[Pooch565]

C25 is a very delicate fuel. I would use it within a year or so of purchase in a 5 gallon can. Now C12 and C16, they will be fine up to 3 years or so. They will still run fine, but they may test low on the NHRA spec.

Thanks,
Jason

[mrhockey]

C25 is a very delicate fuel. I would use it within a year or so of purchase in a 5 gallon can. Now C12 and C16, they will be fine up to 3 years or so. They will still run fine, but they may test low on the NHRA spec.

Thanks,
Jason

So the NO2 fuel would be Ok if not used in a few months as long as it was capped back off in the drum when not being used?

[Ed-vancedEngines]

Do not use VP C-25 with any nitrous engine. That is for a serious N/A engine only.

I will make a suggestion that has nothing to do with your fuel.
I see that you say what your total advance is when all kits are in. At how many degrees advanced is your distributor rotor in perfect index with hte # 1 plug tower conductor in the distributor? When retarding an engine for nitrous use with electronic retards it is very possible to get the rotor too far away from the # 1 cylinder which is under extreme prsssure and is therefore resident to fireing the mixture anyhow. Ignition will jump a little further to the next closest plug position that is no resistance becuase that cylinder will not have as much pressure.

With no mare compression than you have with really good tuning C 14 should work with one kit and the VP C 16 should work with two. I do also think the C 23 is better but does cost a ton more to buy. I do not know anyone who has tried the C 23 NOS yet.

IF any gasoline is not fresh, test it. Higher octane racing fuels can go bad fairly quick and will cause you some kind of grief and have you knocking heads against the wall with unexplanable weird problems.

Run some gas into a cup or can and stick the tip of a # 3 phillips screwdriver in it just a little. Pull the srewdriver back out and hold it horizontal in one hand while lighting a fire to it with the other hand. If it flickers and the gas disapperas it is good fuel.
IF you see it burn and any smoke comes off it, do not use that fuel. It is going dead.

Ed

[mrhockey]

Thanks Ed. I wasn't going to use the C-25.......I think Jason might have brought that up by accident. The NO2 is about $20 more a drum that the C-16 so it isn't a bad upgrade at all.

Unless I misunderstood you post I do phase the distributor so at 3* timing the rotor is hitting the #1 plug at the proper placement.

Thanks for the test tip. I will give that a shot with the C-16 I have here.

[Pooch565]

Sorry guys, I was using C25 as an example of a fuel I would use within a year of purchase. C16, No2, and C23 should be fine for a couple of years or so. I would never recommend C25 for a nitrous combo. I would also never recommend C14 for a nitrous application. It is a very light fuel with a high RVP. You will risk detonation with this fuel. If you are spraying more than 200hp I would go to C16 to be safe. VP NO2 is not based off of C23 either. Thats why it is not as expensive as the C23. We have racers using the NO2 with plenty of success here in the Midwest. Mark, I'm sure you'll be fine on the C16, but I would get some NO2 when you run out of C16. I belive you will be safer, and happier. Good luck!!

Jason

[muddytoy]

EDS BURN TRICK I JUST RECIEVED A NEW SEALED DRUM OF VP-NO2 SO I TRYED ED TRICK IT BURNS YELLOW AND SMOKES SO ITS BAD FUEL...?????

[Pooch565]

I'm going to say I have never heard of "burning fuel" to test if it is bad or not. If you want to check the specific gravity, or the Dialectric Constant, this is a better way to tell if it is bad or not. Where did your NO2 come from? Which warehouse? It is all blended and drummed in Texas, so if yours is bad then there should be a bunch of bad drums out there. I haven't received any calls on bad NO2, so I'm sure you are fine. I'll call our chemist and ask about the "burning" deal and let you know what I find out.

Thanks,
Jason

[DAVE 67]

I'm going to say I have never heard of "burning fuel" to test if it is bad or not. If you want to check the specific gravity, or the Dialectric Constant, this is a better way to tell if it is bad or not. Where did your NO2 come from? Which warehouse? It is all blended and drummed in Texas, so if yours is bad then there should be a bunch of bad drums out there. I haven't received any calls on bad NO2, so I'm sure you are fine. I'll call our chemist and ask about the "burning" deal and let you know what I find out.

Thanks,
Jason

Well is it true "BURNING" FUEL

[NOS-Nelson]

I am running a 421 SBC with SB2.2 heads with 40cc chambers. My compression ratio is 13.6:1 and have always run C-16. I have had the usual lifted ring lands a couple of times, some detonation caused by some wayward oil and was told that maybe due to the timing sensitivity of these heads maybe I should step up for some added protection. I am running 2 foggers and am still working on stepping up but a 28 jet in one and a 34 in another is not out of the question. I am running about 3* total timing when both systems are on. Should I stick with the C-16 or step up to the C-23 or NO2 fuel?

Now that is cause for concern. How far down the piston is the top ring?

[ToyzShopGary]

I learned this one long ago in the early 90's from C&H Dyno Service in Batavia NY. They also were a large compressed gas and welding supply distributor in Western NY at the time. Get a machine shop to make you up some aluminum bungs with an o ring and with a couple fittings on them and then use a bottle of compressed Nitrogen and put a few lbs from memory around 5-10 of Nitrogen in the drum. What it will do is act as a blanket and keep the front end gases of the fuel from evaporating and the fuel will keep indenfinetly.

We did that back then with VP stuff and they did at C&H and the fuel always stayed fresh.

I can probably find the article from Dynotech Maagazine back then if someone needs more info.

[BIGWALT]

VP nos2 fuel I have been running this fuel in my BBC for about 3 years and have only had a problem one time with this fuel and this was my fault. After working close with Jeff Prock of Applied NOS he explained to me that when the fuel is not in use always store it back in the drum. The reason to always store in the drum is to keep it from the direct sun light, for some reason the sun light breaks the NOS2 fuel down and make real yellow looking causing the fuel to go bad. Once I keep it stored in the drum I have never had problems with this fuel. Also store the drum on a piece of wood or off of the direct concrete surface to keep moisture from building up in the drum which usually what causes most fuels to good bad in the drum. Kind of the same princple of fuel under ground at a gas station thats been there a long time or at the bottom of the fuel tank

[Chad0783]

So would I be better off to switch from the VP NOS I have been running and go to C23??? I run 3 systems on a 5'bs 706. and ran 4 systems a few times. Would I see any ET advantage or just a better looking tune up?

Thanks.

[BTR Bill]

Thanks Ed. I wasn't going to use the C-25.......I think Jason might have brought that up by accident. The NO2 is about $20 more a drum that the C-16 so it isn't a bad upgrade at all.

Unless I misunderstood you post I do phase the distributor so at 3* timing the rotor is hitting the #1 plug at the proper placement.

Thanks for the test tip. I will give that a shot with the C-16 I have here.
Very nice car. How quick is it?

[mrhockey]

Thanks Bill. We went 8.40 @ 163 this past year at 3300+ and with 10.5 slicks. Hoping to get into the teens or .20s this coming year. We will see.

[Killer]

I would say bring the timing down to about 26-27