The piston strokes are named in accordance with the processes occurring in them: intake, compression, stroke and exhaust. Inlet – the piston moves down, a vacuum is created in the cylinder, the valve opens and a combustible mixture enters the cylinder, the valve closes, the crankshaft makes a half-turn. Compression – the crankshaft continues to turn, the piston moves up and compresses the combustible mixture, it ignites from the spark and quickly burns out. Working stroke – the piston lowers under gas pressure, transmitting a push to the connecting rod and crankshaft with a flywheel with the valves closed. At the end of the third step, another valve opens to release the products of combustion into the atmosphere. Release – the piston moves upward, the combustion products exit through the valve, at the end of the stroke the valve closes.
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