A compression ratio calculation is pretty straightforward, but involves a little math. So, grab your calculator and let’s crunch some numbers.

Engine Compression Atmospheric pressure at sea level is approximately 14.7 psi. A 9:1 compression ratio cylinder is compressing the air and fuel mixture to about 132 psi at sea level (9x14.7=132.3).

From our rather limited research, it appears that building a performance street engine that combines a decent-duration camshaft with enough static compression ratio to create 175 to 190 psi, will ...