A 4-Stroke Diesel Engine completes a combustion cycle in two revolutions. The four key processes are Intake, Compression, Power and Exhaust. Unlike petrol engine, Air and Fuel is drawn into the combustion chamber and ignite by spark plug. Diesel Engine produces power by compression ignition. Fuel is spray in to the combustion chamber and developed autoignition combustion. It then converts the fuels explosion into mechanical energy.