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The injector has to be able to withstand extremely high temperatures, as well as the very high pressure that is created inside the cylinder. Despite having to put up with all this, it must also be able to deliver the fuel in a fine mist. This mist of fuel must then be circulated in the cylinder so that it is evenly spread out and distributed. Your engine then has enough energy to turn those wheels and get you moving; without a fuel injector in your engine, you would get nowhere! The process of diesel injectors opening, closing and dispensing the correct amount of fuel happens in milliseconds. Injector cycle firing is on average completed in 1.5 to 5 milliseconds. Diesel fuel injectors come in different shapes and sizes depending on the engine make and model as well as power demand. Automotive injectors are quite a bit smaller than heavy-duty diesel applications and are measured in cubic inches. There are two types of diesel fuel injectors: the first is called throttle body injection where 1-2 injectors are located in the throttle body itself in the diesel engine and supply a metered amount of mist fuel spray into the intake manifold. This delivery system essentially charges the intake and the intake valve draws the fuel into the cylinder of the engine. The second delivery system, known as individual port type fuel injector, is newer and more fuel efficient. Port type of injection is more efficient than a carburetor since it adjusts to air density and altitude and is not reliant on the manifold vacuum.
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