The above illustration shows the four-stroke cycle in a single cylinder. This is going on in the other cylinders as well. Repeat this cycle a thousand times in a minute, and you get a car that moves.
Rocker arms are little levers that touch the lobes, or cams, on the camshaft. When a lobe lifts one end of the rocker, the other end of the rocker presses down on the valve stem, opening the valve to let air in to the combustion chamber or letting exhaust out. It works sort of like a see-saw.
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