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A diesel engine works by igniting (igniting) the fuel when it is injected in high-pressure spray in a chamber (or pre-chamber, in the case of indirect injection) of combustion that contains air at a temperature above the auto-combustion temperature, No need for spark as in gasoline engines. This process is called autoinflammation.

The temperature that initiates the combustion comes from the elevation of the temperature that takes place in the second time of the engine, the compression. The fuel is injected into the upper part of the combustion chamber at high pressure from very small holes in the injector, so that it is atomized and mixed with the air at high temperature (between 700 and 900 ° C) and high Pressure. As a result, the mixture ignites very quickly. This combustion causes the gas contained in the chamber to expand, driving the piston outwards.

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Diesel engines require no spark plugs since they are self-igniting engines.

The high compression causes the diesel/air mixture to self ignite due to the very high temperatures generated by the compression.

Some of these engines may have heater plugs which help during extremely cold weather.

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