compression ring

A ring which surrounds the piston and fits in a grove in the piston. It is designed to seal the burning fuel charge above the piston. Generally there are two compression rings per piston and they are located in the two top ring grooves. They also help to transfer heat from the piston into the cylinder walls and subsequently to the water jacket surrounding the cylinder.
Also see

Dictionary of automotive terms. 2015.

Look at other dictionaries:

  • compression ring — noun : piston ring; especially : one placed nearest the working face of the piston …   Useful english dictionary

  • tapered compression ring — The upper compression ring which, due to its tapered cross section, requires a reduced running in period thus ensuring a tight seal quickly …   Dictionary of automotive terms

  • grooved compression ring — A scraper type piston ring …   Dictionary of automotive terms

  • stepped compression ring — See L section ring …   Dictionary of automotive terms

  • ring — A circular piece or band of metal. See balk ring blocking ring chainring chrome ring compression ring control ring D ring D ring dykes ring fire ring …   Dictionary of automotive terms

  • compression — [1] Applying pressure to a spring, or any springy substance, thus causing it to reduce its length in the direction of the compressing force. [2] Applying pressure to a gas, thus causing a reduction in volume. [3] One of the essential factors in a …   Dictionary of automotive terms

  • Compression fitting — A compression fitting 15 mm isolating valve Compression fittings are used in plumbing and electrical conduit systems to join two tubes or thin walled pipes together. In instances where two pipes made of dissimilar materials are to be …   Wikipedia

  • compression joint — noun A joint between two pipes, the seal being created by tightening a threaded nut onto a metal ring • • • Main Entry: ↑compress …   Useful english dictionary

  • Compression ratio — For compression ratio in data compression, see data compression ratio. The compression ratio of an internal combustion engine or external combustion engine is a value that represents the ratio of the volume of its combustion chamber from its… …   Wikipedia

  • ring, compression — See piston ring, compression …   Dictionary of automotive terms

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