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Try not, Do or Do not
Join Date: Apr 2004
Location: Fallbrook, Ca. 92028
Posts: 14,019
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If the actual compression ratio of a piston is 10.2 on a 66mm crank, the compression ratio on a 70.4 crank would be 10.8.
Still a very nice CR for a twin plug engine. As a general rule, .5 change in the compression between 66 and 70.4 is expected.
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