In a 4 stroke ic engine, the ratio of rotational speed of camshaft to crankshaft is
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In a 4 stroke ic engine, the ratio of rotational speed of camshaft to crankshaft is 1 : 2.
The intake and exhaust valves opens once for each two engine revolutions. In a 4 stroke internal combustion engine the camshaft turns exactly half the speed of the crankshaft. A 4 stroke engine requires 2 rotations to complete the entire cycle of intake, compression, power stroke, and exhaust. If the speed is less than 1/2 the speed then the air wouldn't get in or out and the engine wont work.
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