In first phase {intake}, piston goes down to cause vacuum and draws mixture into cylinder through intake valve. In second phase {compression phase}, piston compresses gases as it goes up. In third phase {ignition and expansion}, spark plug fires, and gases burn and expand to push piston down. In fourth phase {exhaust phase}, piston forces exhaust gases out exhaust valve as piston comes back up. Then the four phases repeat {Otto cycle}.
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Date Modified: 2022.0224