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That pressure developed in a reciprocating piston engine at the end of the compression stroke without combustion of fuel.

Related Terms

RESTRICTOR

A device for producing a deliberate pressure drop or resistance in a line by reducing the cross-sectional flow area.

SAFETY CONTROL

Device to stop unit, equipment or system if unsafe pressure and/or temperatures and/or dangerous conditions are reached.

CONTAMINANT CAPACITY

The weight of a specified artificial contaminant that must be added to the influent to produce a given differential pressure across a filter at specified conditions. Used as an indication of relative service life. Also known as Dirt capacity, Dust capacity

BUBBLE POINT

The differential gas pressure at which the first steady stream of gas bubbles is emitted from a wetted filter element under specified test conditions.

CLEAN ROOM

A facility or enclosure in which air content and other conditions (such as temperature, humidity, and pressure) are controlled and maintained at a specific level by special facilities and operating processes and by trained personnel.

CROWN

The top of the piston in an internal combustion engine above the fire ring, exposed to direct flame impingement.

CRACKING

The process whereby large molecules are broken down by the application of heat and pressure to form smaller molecules.

COMPRESSED AIR

Air at any pressure greater than atmospheric pressure.

DEPOSITS

Oil-insoluble materials that result from oxidation and decomposition of lube oil and contamination from external sources and engine blow-by. These can settle out on machine or engine parts. Examples are sludge, varnish, lacquer and carbon.

DIFFERENTIAL PRESSURE INDICATOR

An indicator which signals the difference in pressure between any two points of a system or a component.
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