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General engine question about changing CR General engine question about changing CR
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Old 06-17-2007, 08:30 PM
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Default General engine question about changing CR
What effect on jetting, cam etc. does changing the compression ratio have on engine performnce?
I am thinking seriously about buying a BB 427 ford engine but having the C/R lowered from 13:1 to 10:1. What needs to be changed to get a good running engine? Help.....
Thanks, John
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Old 06-18-2007, 10:40 AM
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as far as jetting.. a lean mixture will contribute to detonation and elevated combustion temps.

A radical cam will bleed down cylinder compression dropping compression somewhat. An aluminum head 427 can live close to 11.0 to 1 compression on 93 octane pump gas. An iron head engine will be about one point lower (10 to 1).
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