A piston is a cylindrical piece of metal which transverses vertically inside the cylinder liner. It moves down as air enters the intake valve, moving up when the intake valve shuts and seals the chamber, compressing the air.

Fuel is added directly into the chamber and heat from the compressed air ignites the mixture, delivering the energy required.

A good piston absorbs the heat generated from the combustion, dissipating it to the cooling system promptly.

The material from which a piston is made not only determines its strength and wear characteristics, but also its thermal expansion characteristics.

AEC piston made of special alloy increases heat strength and reduces the coefficient of expansion so that higher tolerances canbe held as the temperature changes.

Its improved material properties increases tensile and fatigue strength, hardness and resistence to scuffing permitting tight bore clearances.