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 The Read For SpeedSuperCar NedHeadsRolling Thunderz EnginesSpeed SuppliesPower SystemsAbout Rolling Thunderz
THE READ FOR SPEED by Ned Erkman
CHAPTER 3


Cylinder Head Flow Rates

Another important area is determining how much flow is required to properly balance the flow relationship between intake ports and exhaust ports for a specific application. The basic formula for intake to exhaust flow, for a naturally aspirated engine is generally understood to be in the 65% to 75% range. However, when an intake manifold is installed, the airflow to the head can drop from 5% to 30% depending on the efficiency of the intake manifold, and when an exhaust header is installed, the exhaust flow can increase. In addition, the intake and exhaust duration of a camshaft can help to increase airflow and help to provide the proper intake to exhaust flow balance. Producing too much exhaust flow for a specific engine application can hurt performance by reducing engine 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 Of Knowledge
Principle Power
Performance Power of Cylinderheads
Basic Functions
Power Production Science
Intake and Exhaust Valves
Port Shape versus Port Volume
Proper Cylinder Head Modifications
Improper Cylinder Head Modifications
Cylinder Head Flow Rates
Cylinder Head Power Production
Intake Manifold Power Production
Camshaft Power Production
Mathmatical Formulas
Engine Development

Call 416 988-0018 or e-Mail Ned Erkman

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