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Calculate Primary Header Tube Length and Diameter




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These formulas are from A. Graham Bellís Performance Tuning in Theory and Practice
or Philip A Smith's Scientific Design of Exhaust and Intake Systems.


The following calculator can be used to calculate the header dimensions best suited to your combination. The input terms are below:




Enter your information below and select "Calculate"

Stroke: (Inches)
Bore: (Inches)
Number of Cylinders:
Exhaust Valve Diameter: (Inches)
Exhaust Valve Opening Point: (Degrees )
Exhaust Valve Duration: (Advertised)
Exhaust Valve Centerline: (Degrees)
Peak Power RPM:
Volumetric Efficiency:
Calculated information appears below
Input All Values please












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