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The cubical contents of the furnace or combustion chamber.

Related Terms

CROWN

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

CAM

Eccentric shaft used in most internal combustion engines to open and close valves.

ALKALI

Any substance having basic (as opposed to acidic) properties. In a restricted sense it is applied to the hydroxides of ammonium, lithium, potassium and sodium. Alkaline materials in lubricating oils neutralize acids to prevent acidic and corrosive wear in internal combustion engines.

BLOW-BY

Passage of unburned fuel and combustion gases past the piston rings of internal combustion engines, resulting in fuel dilution and contamination of the crankcase oil.

SIMPLE CYCLE

Referring to the gas turbine cycle consisting only of compression, combustion and expansion.

NITRATION

Nitration products are formed during the fuel combustion process in internal combustion engines. Most nitration products are formed when an excess of oxygen is present. These products are highly acidic, form deposits in combustion areas and rapidly accelerate oxidation.

POSITIVE CRANKCASE VENTILATION (PCV)

System for removing blow-by gases from the crankcase and returning them through the intake manifold to the combustion chamber where the recirculated hydrocarbons are burned. A PCV valve controls the flow of gases from the crankcase to reduce hydrocarbon emissions.

SECONDARY COMBUSTION

Combustion which occurs as a result of ignition at a point beyond the furnace.

SECONDARY COMBUSTION

Combustion which occurs as a result of ignition at a point beyond the furnace.

CYLINDER HEAD

Plate or cap which encloses compression end of compressor cylinder or combustion chamber of engine.
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