![]() ![]() It expands as it burns and drives the piston downward. Having been ignited, the fuel-air mixture burns. The intake and exhaust valves are closed. 2.Īs the piston approaches the top of its stroke within the cylinder, an electric spark jumps across the points of the spark plugs and ignites the compressed fuel-air mixture. The movement of the piston upward compresses the fuel-air mixture. 1.ĭuring the compression stroke, the crankshaft continues to rotate, the piston is forced upward in the cylinder, and both intake and exhaust valves are closed. ![]() At the completion of this stroke the intake valve closes. The Four-Stroke Five-Event-Cycle Principleĭuring the intake or admission stroke, the piston moves downward as a charge of combustible fuel and air is admitted into the cylinder through the open intake valve. ![]()
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