Fuel is admitted to a diesel engine cylinder through the:

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In a diesel engine, fuel must be introduced directly into the combustion chamber in a fine spray for reliable ignition under high compression. The injector nozzle is the component that atomizes and delivers the fuel into the cylinder at the correct timing and pattern. The air is drawn into the cylinder through the intake path, and ignition occurs from compression, not a spark. The fuel injector pump supplies high-pressure fuel to the injectors, but the actual entry point of fuel into the cylinder is the injector nozzle. That’s why the injector nozzle best fits the description.