cbn70 Posted August 29, 2006 Report Posted August 29, 2006 Just wondering if someone has a chart that had compression vs. what octane fuel to run. Courious to know where the cutoff is between premium and 50/50 race and premium and 100 percent race gas(110 octane). Some one must know?? Quote
dajogejr Posted August 29, 2006 Report Posted August 29, 2006 I'll stick my neck out...your milage may vary... These are ESTIMATES only....so, don't blow your bike up and tell me about it. Keep in mind, these estimates with a properly jetted bike and NO timing advances. Advancing your timing can and usually will requre a few more ocatane points. Keep in mind, pump gas ranges in the 91 to 94 octane range, and I'd say race gas averages 110 octane.... 149 PSI and below, premium pump gas 150 to 165ish, 50/50 mix race and pump 165 and above, pure race gas. Again...these are just average numbers....I think once you start getting into compression and timing advances more than just a little (say .020 or more off the head, or 20cc or smaller domes) you might as well just run race gas...and bump the timing while you're at it.... Again...my disclaimer...approxamate numbers only...so, check your plugs and listen to your engine... No one will make a chart because each bike is different...air is different, temps are different... There are simply too many variables to chart this out. Plus, there'd be liability on there part. Quote
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