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PERFORMANCE MOTORCYCLE PARTS AND KITS FOR AMERICAN V-TWINS

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Piston Terms

When describing pistons for custom applications it is helpful for everyone to use the same terms. One common area of confusion is the meaning of the terms "piston deck" and "piston dome". The deck of a piston is the point at which the dome begins. Some pistons have a flat area at this point and some do not. The dome is the very top of the piston, which in some cases extends up into the combustion chamber, and in some cases is flat at the level of the deck or even below. "Deck Height" refers to the distance between the center of the wristpin hole to the deck of the piston. Piston deck height is needed to calculate cylinder length when designing an engine, or when replacing a piston in an existing engine.

Piston terms