Excavator engine

Most excavator engines are compression-ignition diesel engines, which achieve energy conversion through four strokes: intake, compression, power, and exhaust. During the intake stroke, the engine draws in air; during the compression stroke, the piston compresses the air and heats it up, bringing it to the diesel auto-ignition point. At this point, the injector sprays fuel, forming a combustible mixture that burns automatically. The energy generated by combustion pushes the piston to perform work; finally, the piston expel the burned exhaust gas from the cylinder, completing a working cycle.