Introduction

I have to start this off with a warning. There are a LOT of calculations and theories when it comes to headers. From the way it has been discussed on various forums lately it is obvious how little they are understood. The links below will be great resources, so read this to get an overview I guess, then tackle the real IN DEPTH theory.

What are Headers?

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I think that equal length primaries are a LOT more important than most people think.

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Role

The connecting rod's job is to take the power given from the top of the piston, and transmit it to the crankshaft. The stress put upon the connecting rod is extreme, as it not only has the force from combustion to contend with, but also the inertia from reciprocation. So not only does it have thousands of pounds of pressure pressing down on it, the rod also has the effect of stretching from BDC to TDC on the exhaust stroke. Not a simple task, yet most of us ignore this very important piece of metal in our motors.

Types

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Role

As one of the major moving parts in the power-transmitting assembly, the piston must be so designed that it can withstand the extreme heat and pressure of combustion. Pistons must also be light enough to keep inertial loads on related parts to a minimum. The piston aids in sealing the cylinder to prevent the escape of combustion gases. It also transmits some of the heat through the piston rings to the cylinder wall.

Types

Cast

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