C12 vs pump gas

[Mike Croley]

Originally Posted by dartman

I have a low compression 340 combo,and when I put c12 or blue in it, it's starts to skip at high rpm in high gear (5800 to 7000 rpm) but with high octane pump gas it runs clean.any help would be great.

I don't imagine that the brand X race fuel is your problem . Your combination shouldn't require a lot of motor octane . Truthfully , if it runs good on 92 or 93 octane i'd stay with that . Keep a close eye on the plugs at all times , and if you ever see any evidence of detonation , switch to a good 110 . The difference in price between pump gas and race fuel isn't really very significant when you consider the relatively small amount of fuel you use at the track .