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| THE READ FOR SPEED by Ned Erkman |
| CHAPTER 3 |
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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.
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.
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