Transcription: In a gasoline engine, a volatile mixture of fuel and air is ignited within a cylinder causing a sudden expansion of gases. The expanding gases push down on a piston which turns the crankshaft. A stroke is one movement of the piston either up or down. Most car engines use a four-stroke cycle. The piston moves four strokes then repeats the action continuously. During the first stroke, the intake valve opens. The piston moves downward and the fuel and air mixture is drawn into the cylinder. During the compression stroke, the valve closes, the piston moves up, and the mixture is compressed. In the ...
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