The lubrication system
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The lubrication system is designed to keep the components in the engine lubricated and to reduce friction.
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Splash system
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In the splash lubrication system, a dipper or slinger splashes oil through the internal parts of the engine. Oil is also splashed up to the valve mechanism.
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Pressure system
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In force-feed lubrication, pressure forces oil around the engine. In a wet-sump system, oil is kept in the sump ready for the next use. In a dry sump system, oil falls to the bottom of the engine and a scavenge pump sends it to an oil tank.
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2-stroke engine premix fuel systems
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Most 2-stroke gasoline engines use a set gasoline-oil mixture for lubrication. As the air, fuel and oil enter the crankcase, the fuel evaporates, leaving behind enough oil to keep parts coated and lubricated.
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2-stroke engine oil injection systems
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An oil injection system doesn’t need the oil and gasoline mixed manually. An engine-driven oil pump takes oil from a tank and pumps a measured amount directly into the engine where it mixes with the fuel and lubricates the internal engine parts.
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Rotary engine lubrication system
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In addition to normal internal lubrication, the rotary engine uses oil injection. A pump injects a measured amount into the intake manifold. Oil from these nozzles goes to the engine and lubricates the rotor seals.
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| Corrosion/noise reduction |
Engine oil performs many other functions apart from lubricating moving components. Two other functions are corrosion protection and noise suppression. |
