Glossary “compressor discharge pressure switch” Definition:
Pressure operated electrical switch that opens the compressor-clutch circuit during high-pressure conditions.
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compressor protection switch
Glossary “compressor protection switch” Definition:
Electrical switch installed in the rear head of some compressors to stop the compressor in the event of a loss of refrigerant.
compression valve
Glossary “compression valve” Definition:
Calibrated valve, located at the base of the shock absorber, providing variable resistance to fluid flow during compression (jounce).
compressive strength
Glossary “compressive strength” Definition:
Maximum compressive stress that a material can withstand without significant plastic deformation or fracture.
compressor
Glossary “compressor” Definition:
1). A component of the refrigeration system that pumps refrigerant and increases the pressure of the refrigerant vapor. 2). Device used to pump airb by increasing its pressure.
compressor crankshaft seal
Glossary “compressor crankshaft seal” Definition:
Term for compressor shaft seal.
compression testing
Glossary “compression testing” Definition:
Test of the engine compression through the spark plug hole to determine if the pistomn and rings is sealing adequately.
compression ring
Glossary “compression ring” Definition:
A piston ring that seals pressure during the compression and power strokes. There are usually two compression rings per piston.
compression seal
Glossary “compression seal” Definition:
A metal seal found in a direct injection system, to resist compression pressures.
compression stroke
Glossary “compression stroke” Definition:
Movement of the piston from BDC to TDC, immediately after the intake stroke. The upward movement of the piston squeezes the A/F mixture into the combustion chamber. In diesel applications, only air is compressed during this stroke. This is the second stroke in the four-stroke cycle.
compression height
Glossary “compression height” Definition:
Distance, as measured from the crown of the piston to the center of the wrist pin.
compression ignition
Glossary “compression ignition” Definition:
Operating system of a diesel engine, where air, heated by compression is used to ignite the fuel.
compression intake valve
Glossary “compression intake valve” Definition:
Term used for compression valve or intake valve.
compression loaded ball joint
Glossary “compression loaded ball joint” Definition:
Suspension ball joint, mounted above and positioned on the knuckle, so the vehicle weight forces the ball into the joint socket.
compression pressure
Glossary “compression pressure” Definition:
Highest pressure developed during the compression stroke in an engine, as checked with a compression gauge.
compression ratio (CR)
Glossary “compression ratio (CR)” Definition:
1). Measurement of volume compressed inside an engine cylinder. If compressed to 1/10 of its original volume, the compression ratio is 10 to 1. 2). The ratio of the volume in the engine cylinder with the piston at bottom dead center compared (BDC) to the volume at top dead center (TDC)
compression
Glossary “compression” Definition:
1). Process of squeezing a vapor (gas) into a smaller space. 2). The upward stroke of a piston that compresses the fuel/air mixture into the combustion chamber prior to ignition
compression braking
Glossary “compression braking” Definition:
Slowing of a vehicle restricting a diesel engine exhaust flow, such as that provided by a Jake brake. It is a misnomer that a gasoline engine will slow the vehicle by compression braking; actually, vacuum causes the braking effect.
compression fitting
Glossary “compression fitting” Definition:
Fittings that compress the end of a nut or a sleeve to provide a seal.
compression gauge
Glossary “compression gauge” Definition:
A gauge used in the spark plug hole of the cylinder head to measure cylinder compression pressures of a gas engine. Removing the glow plug from a diesel engine allows for the installation of higher pressure rated compression gauge used to measure cylinder compression.