Engine "Rough" Horsepower Calculation By Bowling & Grippo

This is simple determination of rough engine horsepower output based on a "mean" cylinder compression ratio. Use this for extreme ballpark use only. Remember, this is one of those equations that work for some cases and leave you scratching your head for others.....

Now, for real fun, grab hold of those "hot" figures often quoted in racing magazines, by friends, etc, and plug them in here - see what checks out

User Input:

Displacement Number Input: Units For Input:

Mean Compression Ratio:

Engine RPM (Where Peak HP will Occur):

Press this button to submit a computation: .

To reset the form input: .

Bruce A. Bowling
Al C. Grippo