Just curious but has anyone made a high compression M20 that could still run on 91 or 93 octane. With the right cam I think you could do 11.5:1 without detonation, especially since M20's have AL heads from the start. Domestic V8's are running compression that high with aluminum heads, cam and a good tune.
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I have pinging issues with my stock seta on 89. I would hate to drive it with any higher compression.
I am interested in this also. Going to rebuild next year.88 325 S-ETA --Wahwooweewah -
10:1 works pretty well with 92, 11:1 would work fine with an agressive cam.Comment
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you probably have heavy carbon deposits, or perhaps it's running lean - seeing how all the M20s were designed to run on 87 octane, it's not the compression ratio that's causing it.Originally posted by 153624 View PostComment
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anyone ever looked into cylinder head/piston coatings. They are supposed to let you run even more compression without detonating and are really good on forced induction motors.Comment
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