Quote:
Originally Posted by Enzo_Guy
I would be really wary of 85, there's a good amount of ethanol in that. With your 12.8:1 ratio, I would ONLY use 93+. Anything can cause serious detonation at that high of a CR.
With V8 cars the generally accepted line between using 93 and 101+ is ~10.5:1, so think about how much higher than that you are (the difference being that the cylinder walls on a bike stay cooler and are less likely to detonate at higher CRs, but 12.8 is very high regardless).
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You know very little about valve timing do you.