QuestionJuly 14, 2025

Why do the camshafts rotate at half the speed of the crankshaft? Because the exhaust valve must be opened 2 x per crankshaft revolution. Because the intake valve must be opened 1 x per 2 crankshaft revolutions. Because the exhaust valve must be opened 1 x per 2 crankshaft revolutions. Because the intake valve must be opened 2 x per crankshaft revolution.

Why do the camshafts rotate at half the speed of the crankshaft? Because the exhaust valve must be opened 2 x per crankshaft revolution. Because the intake valve must be opened 1 x per 2 crankshaft revolutions. Because the exhaust valve must be opened 1 x per 2 crankshaft revolutions. Because the intake valve must be opened 2 x per crankshaft revolution.
Why do the camshafts rotate at half the speed of the crankshaft?
Because the exhaust valve must be opened 2 x per crankshaft revolution.
Because the intake valve must be opened 1 x per 2 crankshaft revolutions.
Because the exhaust valve must be opened 1 x per 2 crankshaft revolutions.
Because the intake valve must be opened 2 x per crankshaft revolution.

Solution
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Answer

Because the intake valve must be opened 1 x per 2 crankshaft revolutions. Explanation 1. Understand Engine Cycle In a four-stroke engine, each cycle consists of two crankshaft revolutions. 2. Analyze Valve Operation Each valve (intake and exhaust) opens once per cycle, which is every two crankshaft revolutions.

Explanation

1. Understand Engine Cycle<br /> In a four-stroke engine, each cycle consists of two crankshaft revolutions.<br />2. Analyze Valve Operation<br /> Each valve (intake and exhaust) opens once per cycle, which is every two crankshaft revolutions.
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