Compression Ratio . . . Power???

[nonosstang]

How much power would you lose by dropping your compression ratio from 10.3:1 down to 9.3:1? Would it be a lot? Say the motor is a 400hp 302.

I'm not looking for a specific number or anything . . . just an idea.

 

[SadbutTrue]

i heard something from a mopar friend that said 1 point in compression ratio (ie, 9:1 to 10:!) was about 10% of your net power. But I can't say I've seen anything that confirms it, though a little under 10%, somewhere in the 5-8% range, seems to make sense to me.

 

[SadbutTrue]

doh

 

[Max Power]

Saw a test in Hit Rod last year on a mopar 440 that yielded a 4% change for every point in compression.