# Engine Horsepower/RPM Predictor By Bowling

Dan Bratten suggested a program which would relate engine power and RPM
to CFM (cubic feet per minute of air flow). I developed the following: Enter the maximum flow values
at a given test pressure, engine CID and number of cylinders, and the
program will compute maximum engine horsepower and the RPM which this
maximum occurs. The test pressure can be entered in inches of mercury
or inches of water, the latter a common unit used on head flow benches.

## Algorithm:

The following equations were used in the above calculation:
cidone = cid/cyl
if units="Inches_Water" then cvt = 10 else cvt = 0.735
cfmcorr = cfm * sqrt(tp / cvt)
hp = 0.43 * cfmcorr * cyl
rpm = 2200.0 * cfmcorr / cid

Bruce Bowling

bbowling@earthlink.net

Bowling Superior