Todays date is 4/19/2024




Calculate Your HP From Head Air Flow



Back to Calculators       Index
These equations are for recreation only.
Not a substitude for actual testing.
The HP is based on flywheel HP, for rear wheel HP multiply the results
by your drive train percentage loss and subtract it from the result.
This calculator is based on Naturally Aspirated applications.

Estimate Horsepower from Head Airflow
Enter Depression of Airfow in Inches of Water:
(The pressure your heads were flowed at)
Enter Head Air Flow in CFM:
Engine CID:
Select Type of Engine Work: Typ Race Eng
SuperStock
ProStock/Comp
Mountain Engines
Enter Number of cylinders:
Input Head CFM, CID, and Test Pressure Please

These calculations are for port work with no 'choke'. "Choke" is defined as the intake port with flow, but not adequate cross sectional area to provide real intake flow to fill the cylinders. To figure your 'choke' - Choke Calc