The piston is a reciprocating mechanical disc that reciprocates forward and backward inside the compression chamber of the engine. It transfers its motion to the crankshaft via a connecting rod. A piston is a component of reciprocating engines , reciprocating pumps , gas compressors , hydraulic cylinders, and pneumatic cylinders, among other similar mechanisms. It is the moving component that is enclosed in a cylinder and made gas-tight by piston rings. 7 Parts of Piston and Their Functions [Complete Guide]: – In an internal combustion engine, a piston is perhaps one of the best parts that assist the working of the combustion cycle. A piston is pretty much just a solid cylinder of metal that moves up and down in a similarly cylindrical hollow in the engine block. The piston itself is slightly smaller than the tube it moves in, but it is banded by piston rings under tension that manage to achieve an (nearly) air-tight seal against the inner side of this ‘barrel’. In this article, you’ll learn about the piston , types of pistons , piston clearance, Piston head or shape and high performing pistons. The meaning of PISTON is a sliding piece moved by or moving against fluid pressure which usually consists of a short cylindrical body fitting within a cylindrical chamber or vessel along which it moves back and forth.