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Automotive glossary: What is Injection?

Definition of Injection: All diesel engines and nowadays the most gasoline engines have an injection system for supplying the engine with fuel. There is direct injection and chamber injection. With direct injection, the fuel is directly sprayed with high pressure into the combustion chamber of the engine, which lowers the fuel consumption a bit, but tends to increase the noise level of the engine. The alternative choice is the injection into a pre-combustion chamber, so that the mixture arises outside the cylinder and is sucked in, similarly as with a carburetor engine. In order to provide an optimal gasoline air mixture with the correct timing at all driving ranges, the injection system has to be controlled in dependency on the engine speed and the operational temperature.

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