This calculator gives the baseline horsepower and cubic feet per minute (cfm) that an engine will develop at its maximum rpm given the volumetric efficiency of the engine. A guide on volumetric efficiency values is provided below.
| variable | description |
| cubic inches | the total displacement of the engine in cubic inches (see our cid calculator) |
| max rpm | the engines maximum rpm limit |
| volumetric efficiency | the volumetric efficiency is a measure of the efficiency of the engine moving the intake charge into the chamber and the exhaust out. Typical values are as follows: 2 valve head – 80% 4 valve head – 88% it is not unusual however to have VE’s of 95% or more in correctly built race engines |
| cubic feet per minute | the total cubic feet per minute of air that the engine will consume |
| brake horsepower | the brake horsepower of the engine at the flywheel |
| related calculators |