Quote:
Originally Posted by krkucin
10.1 Comp ratio, aluminum heads and a Comp Cam with 589 in. 615 ex. I do have a small airport 4 blocks away.
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It's the duration of the intake valve that matters. The longer it stays open on the compression stroke the less "true compression" you really have. FWIW, I have a 10.6 comp ratio, aluminum heads, and 245 degrees duration at .050 on the intake valve and I run just fine on 93 octane gas with the ethanol mix (which is all I have in my area). The ethanol does clog up the air bleeds from time to time by flecking the
zinc off the bowls, and that will make you think your engine has one foot and three toes in the grave.... Do a quick search on this forum to find the threads on that so you know what to look for.