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An engine test in a General Motors diesel engine to determine detergency, corrosiveness, ring sticking, and oxidation stability properties of lubricating oils.



Related Terms

L-1 TEST

A 480-hour engine test in a single-cylinder Caterpillar diesel engine to determine the detergency of heavy-duty lubricating oils.

L-4 TEST

An engine test in a six-cylinder spark-ignition Chevrolet engine to evaluate crankcase oil oxidation stability, bearing corrosion, and engine deposits.

L-2 TEST

An engine test made in a singlecylinder Caterpillar diesel engine to determine the oiliness of an engine oil. Also known as scoring test.

BYPASS TYPE LUBRICATING OIL SYSTEM

In an auxiliary diesel engine bypass type lubricating oil system, the main lube oil pump forces some of the oil used by the engine through a filter.

L-3 TEST

An engine test in a four-cylinder Caterpillar engine to determine stability of crankcase oil at high temperatures and under severe operating conditions.

NATURALLY ASPIRATED

A term used to describe a diesel engine in which air flows into the engine by means of only.

API ENGINE SERVICE CATEGORY

Gasoline and diesel engine oil quality levels established jointly by API, SAE, and ASTM, and sometimes called SAE or API/SAE categories; formerly called API Engine Service Classifications.

POLAR AIR

A type of air whose characteristics are developed over high latitudes, especially Within the subpolar highs. Continental polar air has low surface temperature, low moisture content, and especially in its source regions, has great stability in the lower layers. It is shallow in comparison with arctic air. Maritime polar air initially possesses similar properties to those of continental polar air, but in passing over warmer water it becomes unstable with a higher moisture content.

DIESELING

  1. Explosions of mixtures of air and lubricating oil in the compression chambers or in other parts of the air system of a compressor. 2. Continuation of running by a gasoline spark-ignition engine after the ignition is turned off. Also known as run-on.

OCTANE NUMBER

A rating that indicates the tendency to knock when a fuel is used in a standard internal combustion engine under standard conditions; n-heptane is 0, isooctane is 100; different test methods yield other values variously known as research octane, motor octane, and road octane.

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