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An indirect injection Diesel engine delivers fuel into a chamber off the combustion chamber, called a prechamber, where combustion begins and then spreads into the main combustion chamber. The prechamber is carefully designed to ensure adequate mixing of the atomized fuel with the compression-heated air. This has the effect of slowing the rate of combustion, which tends to reduce audible Noise . It also softens the Shock of combustion and produces lower stresses on the engine components. The addition of a prechamber, however, increases heat loss to the cooling system and thereby lowers engine efficiency.

Aside from the above advantages, early diesels often employed indirect injection in order to use simple, flat-top Piston s, and made the positioning of the early, bulky diesel injectors easier.