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Old 01-13-2004, 03:25 PM
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If you were to have an actual 9.5:1 engine you could probably run 4psi of boost maybe 6 with forged pistons. Go here and look at the recommendations most companies will tell you that an "effective" ration should not exceed 12.4:1 on pump gas. This is a little conservative and will depend on many other things. If you are seriously thinking about putting a blower on it and you have forged pistons decent rods/bolts and crank. If you have 64cc heads, I would swap them out for a set of 76cc heads and lower the compression to a blower friendly level. A blower is a big investment, you might as well make the most of it if you are going to bolt it on. This means a compression level of 8:1 - 8.5:1 (maybe slightly higher).
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