A piston is a reciprocating component in the cylinder block of an automobile engine. The basic structure of a piston can be divided into the top, head, and skirt.
The piston top is the main part of the combustion chamber, and its shape depends on the type of combustion chamber used. Gasoline engines mostly use flat-top pistons, which have the advantage of a smaller heat absorption area.
Diesel engine piston tops often have various recesses; their specific shape, location, and size must be adapted to the requirements of mixture formation and combustion in a diesel engine.
