Re: C12 vs pump gas
Octane slows down the burn rate of fuel. As you add compression you are adding heat by increasing cylinder pressure so you add octance to keep the fuel from spontaneously combusting (detonating). If you don't have enough heat and too slow of burning fuel, it will not light consistently and you can get the miss you are describing. C-12 is 108 motor octane which is probably too much. Try a 110, although ours (Renegade) is 108 octane also, but we have a Blue haze 110 that is only 105 motor octane. You can mix 110 with premium pump gas and you may find a nice happy medium. You'll get enough octane for protection but not too much to light. My son ran this combo in a 350 cu, 10:1 engine and won back to back track championships at Indianapolis Raceway Park.
PS, not saying mixing fuel will win rounds, he is just a helluva driver...but it did keep the engine together.
Good luck!
Ron Finney - 396V S/C
Indiana Distributor for Renegade Racing Fuels
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Ron Finney 396V S/C
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