The compression ratio isn’t just a number: it’s one of the greatest determining factors in engine building. Compression ratio determines the type of fuel, how m ...

Since cam selection is largely determined by the other two factors, you need to know how to calculate your compression ratio and freeway rpm. We′ll show you how it's done.

This amount is known as the piston deck height, and it affects compression ratio because it affects the volume of air in the combustion area when the piston is at TDC.

F. G. Wirbeleit, K. Binder, D. Gwinner, Development of Pistons with Variable Compression Height for Increasing Efficiency and Specific Power Output of Combustion Engines, SAE Transactions, Vol. 99, ...

How to Calculate Compression Ratio from Scratch As an example, let's calculate the CR for a popular big-block Chevy application.