Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. The term parasitic loss is often applied to devices that take energy from the engine in order to enhance the engine's ability to create more energy. In the internal combustion engine, almost everything, including the drive line, causes parasitic loss. Bearings, oil pumps, piston rings, valve springs, flywheels, transmissions, driveshafts, and differentials also rob the system of power. An oil pump, being used to lubricate the engine, is a necessary parasite that consumes power from the engine (its host).Another example is supercharger, which derives its power from the engine and creates more power for the engine. The power that the supercharger consumes is parasitic loss and is usually expressed in horsepower (HP). While the HP that the supercharger consumes in comparison to what it generates is small, it is still measurable or calculable. One of the desirable features of a turbocharger over a supercharger is the lower parasitic loss of the former.

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