What octane to run with 19cc heads

[RBT]

C12 is plenty safe, I’ve used it over 250 cranking with more than 25 degrees plenty of times

[Brookbbb]

C12 is plenty safe, I’ve used it over 250 cranking with more than 25 degrees plenty of times

Should I bother splashing a little ACES in with the c12 just to be safe?

[RBT]

Nope

[patchesII]

Should I bother splashing a little ACES in with the c12 just to be safe?

With 19 cc heads you’re not even stressing C12 very hard. That’s the spec fuel in DSRA and ODBA. There are guys running 280 lbs of compression on it, and probably more in some cases

[HStream1]

I run 112 with 17 cc cups with no problem. I do add a splash of ACES not because it does anything to the octane but because of its Top Cylinder Lubricity characteristics. But if you race with a club that specs fuel. Dont use it. Youll get DQ'd

Should I bother splashing a little ACES in with the c12 just to be safe?

[Brookbbb]

Awesome, thanks for all the info guys, really appreciate it.

[bigbluechevy454]

C12 is plenty safe, I’ve used it over 250 cranking with more than 25 degrees plenty of times

Wow. Ive never had a motor with 250psi cranking compression. Possibly static but not off the starter you must like: EM tight “A”

[RBT]

I’m not going to dignify that with a response EH.

[bigbluechevy454]

I’m not going to dignify that with a response EH.

I hope all is well bud!

[Krazymaan]

I run 17cc's on one of my 24's and the cranking compression is 295 psi's.

[patchesII]

At that point you’re going backwards

[90 5.0]

At that point you’re going backwards

Couple guys tried 16cc last season and kept breaking stuff, and it wasn’t really any faster than 19cc I don’t think.

Hope i remember where I left my drag before catahoula rolls around haha

[patchesII]

I’ve ran 285 psi before. Hit good but didn’t want to turn up