How is fuel admitted to a diesel engine cylinder?

Fuel is admitted to a diesel engine cylinder through the injector nozzles. In diesel engines, the process of fuel injection is crucial for the engine's operation. Unlike gasoline engines, which mix air and fuel before it enters the cylinder, diesel engines inject fuel directly into the combustion chamber at high pressure through these nozzles. This method allows for precise control of the fuel spray pattern, timing, and quantity, which leads to efficient combustion.

The injectors atomize the fuel, creating a fine mist that mixes with the incoming compressed air in the cylinder. This is key to achieving the optimal air-fuel mixture necessary for effective combustion. The high temperature of the compressed air ignites the fuel as it is injected, enabling the engine to operate more efficiently and with higher power outputs.

In contrast, other methods mentioned, such as through intake valves or a carburetor, are used in different types of engines but are not applicable for diesel engines. Intake valves are part of the intake system that brings air into the cylinder, while carburetors are used mainly in gasoline engines to mix air with fuel before it enters the cylinder. Exhaust ports are utilized to expel combustion gases from the cylinder after the fuel has been burned and have no role in fuel admission