Repair 7

How to Size Pipe Headers

The size of an exhaust header pipe should match the needs of a particular vehicle. You can find the size of a header pipe by performing a simple math equation. To do this you first need to obtain variables to use in the equation. These variables include the engines cubic inch displacement, its maximum revolutions per minute and the outside diameter of the header tube. You can find the variables for the equation by referencing your owners manual or a repair manual for the vehicle.

Instructions

1

Write the equation for calculating pipe header size. This is expressed as L = CID x 1900/RPM x OD.

2

Input the cubic inch displacement of the engine for CID. Input the maximum RPM of the engine into the equation. Input the Outside Diameter of the header tube for OD in the equation.

3

Multiply the CID by 1900 and note the result. Multiply the maximum engine RPM by the OD and note the result. Divide the first result by the second result to obtain the size of the pipe header.