M-450 horsepower?

For instance a 281 cid with 8060 [200 cc] head, flat top pistons, 80% volumetric effiecncy, 1500 rpm, 6.3-1 compression ratio, horsepower 39. Add a 40 cc dome to the piston and CR goes to 7.5, HP 47. 60 cc dome, CR 8.4, HP 52.

The 1 inch stroke 333 cid motor with flat tops, CR 7.3, HP 54. With 40 cc dome CR 8.8, HP 65. With 60 cc dome CR 9.8, HP 73.

Again these are only estimations. It's pretty apparent that cubic inches and compression both boost power, only sometimes not as much as we'd hoped for.

But their equation WAY over estimates the effect of compression ratio.

The equation assumes a linear relationship between compression ratio and power. I know because when I punched in a combination that was 10:1 and then a combination that was 12:1, the later calculated exactly 20% more power corresponding to the 20% increase in compression ratio.

But the relationship between power and compression ratio is not linear - as compression ratio increases the power increases at an exponentially decreasing rate. In other words assume for the sake of argument that a 10% increase in compression ratio from 10:1 yeilds a 10% increase in power. A 10% increase in compression ratio from 11:1 would yeild some gain in power (call it X) less than 10% and a 10% increase in compression ratio from 12:1 would yeild some gain in power less than X.

Additionally, any knowledgeable performance engine builder will assure you that a bump from 10:1 to 12:1 will not yeild 20%. Probably a little less than 10% in reality.