Aviation dictionary. 2014.
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
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
Rings of Saturn — The full set of main rings, imaged as Saturn eclipsed the Sun from the vantage of the Cassini spacecraft on 15 September 2006 (brightness is exaggerated). The pale blue dot at the 10 o clock position, outside the main rings and just inside the G… … Wikipedia
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
