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 The Read For SpeedSuperCar NedHeadsRolling Thunderz EnginesSpeed SuppliesPower SystemsAbout Rolling Thunderz
THE READ FOR SPEED by Ned Erkman
CHAPTER 6


Power Calculations from Flow Bench Testing of Intake Air Flow

The horsepower potential of an engine can be calculated by the airflow capability of the cylinder head and intake manifold.

Airflow testing of cylinder heads and intake manifolds can be conducted on a flow bench machine and horsepower calculations can be estimated from the flow bench test data.

The standard measure for flow testing is 28" of test pressure on a Superflow 600 flow bench.


The simple mathematical formula for calculating potential power for a V8 engine is to multiply the flow bench cfm rating at 28 inches of test pressure by 2 to get the estimated power capability. This means that every (1) cfm of airflow can produce (2) horsepower in a V8 engine.

For example, a cylinder head that flows 250 cfm at 28 inches of test pressure has the potential to produce 500 hp. Although the intake airflow capacity provides the potential for two horsepower per cfm, the engine must have the best compression ratio, the proper camshaft profile and a properly tuned high flow exhaust system. Restrictions in the air intake system must also be minimized as air flow through the entire air intake system is what determines total power output.

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Ned Erkman
Author of The Read for Speed

Copyright 2005 The Read For Speed. All Rights Reserved.
Reproduction in whole or in part without expressed written permission from the author
is strictly prohibited.


power
Performance Principles of Power & Acceleration
Performance Power of Cylinderheads
Intake Manifold Power Production
Camshaft Power Production
Mathmatical Formulas
Mathmatical Formulas
Engine Air Flow Requirement Calculations
Horsepower to weight formulas
Horsepower requirements for mph
Horsepower requirements for et
Engine size calculations
Piston Speed - Crankshaft Stroke
Horsepower to weight formula
RPM Formula - Gear Ratio and Tire Diameter
Engine Development

Call 416 988-0018 or e-Mail Ned Erkman

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