Performance Exhaust Systems: How to Design, Fabricate, and Install

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Mike Mavrigian. Performance Exhaust Systems: How to Design, Fabricate, and Install

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Acknowledgments

Introduction

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Cylinder head intake port shape, cross-section area, and volume can be considered limiting factors when discussing engine performance in naturally aspirated applications. Generally speaking, most engines that perform well in naturally aspirated form perform even better when forced-induction strategies or nitrous oxide is added.

Intake port shape is dictated by the envelope of space given by the overall design of an engine, valvetrain layout, and intended vehicle application. In terms of pushrod-type engines, the intake port width must not be much larger than the distance between the pushrods, generally called the “pinch point” of an intake port. There are several strategies for increasing the distance between pushrods, including offset lifters, offset rocker arms, and compound valve angles.

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