compression rings

The top rings used on reciprocating engines’ pistons. They seal the cylinder, so that an upward-moving piston can compress the air into the cylinder. Compression rings also transfer heat from the piston to the cylinder wall.

Aviation dictionary. 2014.

Look at other dictionaries:

  • 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 …   Dictionary of automotive terms

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  • compression check — Testing the compression in all the cylinders at crankingspeed. All plugs are removed, the compression gauge placed in one plug hole, the throttlecracked wide open and the engine cranked until the gauge no longer climbs. The compression check is a …   Dictionary of automotive terms

  • compression gauge — [1] A gauge used to test the compression in the cylinders. A poor compression reading can indicate that there is leakage through the valves or the piston rings. In two stroke engines, it could indicate that there is poor primary compression… …   Dictionary of automotive terms

  • compression test — A maintenance test performed on a reciprocating engine to confirm the ability of the cylinders to hold the designed air pressure. A cylinder will fail a compression test if there is excessive leakage past the rings or any leak from inlet or… …   Aviation dictionary

  • compression leakage — In an engine, when some gases escape past the piston because the rings or cylinder walls are worn, the compression is reduced so that there is less efficiency …   Dictionary of automotive terms

  • compression wood — noun : reaction wood formed on the lower sides of branches and leaning trunks and characterized by darker color, glassy appearance, relatively wide and eccentric annual rings, shorter vascular elements, and excessive and uneven shrinkage compare… …   Useful english dictionary

  • differential compression check — A maintenance check to determine the condition of piston rings and the cylinder valves of a reciprocating engine …   Aviation dictionary

  • Piston ring — A piston ring is an open ended ring that fits into a groove on the outer diameter of a piston in a reciprocating engine such as an internal combustion engine or steam engine. The three main functions of piston rings in reciprocating engines are:# …   Wikipedia

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