What Power Increase from Compression Ratio?

[andrew15]

I was looking at replacement pistons and was wondering....
All things being the same, what would be the effect from an increase in the compression ratio for a 2.7L RS Spec engine?
Can anyone guestimate the following?
2.7RS w/ 8.5 comp ratio = 210 hp
2.7RS w/ 9.0 comp ratio = ??
2.7RS w/ 9.5 comp ratio = ??
2.7RS w/ 10.0 comp ratio = ??
2.7RS w/ 10.5 comp ratio = ??
2.7RS w/ 11.0 comp ratio = ??

Regards,
Andrew M

[tbitz]

equation for engine efficiency is 1-(1/CR)^0.4

for 8.5:1 you get 57.5%
for 11:1 you get 61.7%

a net gain of 7.3% or 225Hp @ 11:1