Question

In a 4 stroke IC engine, the ratio of rotational speed of camshaft to crankshaft is

Answer 1

On 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 (a down stroke), compression (up stroke), power stroke (down), and exhaust (up).

Answer 2

1/2 is the required answer

Cam is used for valve timing and crank is used for the plunger movement. 4strokes need 2 revolution of crank and exactly 1 revolution of cam. During suction and Exhaust valves operate.

Speed of cam/speed of crank=1/2

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