Correct answer
Half a revolution of the crankshaft.
Half a revolution: 180 degrees. A stroke is the piston’s movement from top dead centre to bottom dead centre or vice versa. The complete four-stroke cycle requires four strokes and two crankshaft revolutions, 720 degrees. A stroke, a complete cycle and the firing interval between different cylinders are distinct concepts.
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Two revolutions of the crankshaft.
Half a revolution of the crankshaft.
One revolution of the crankshaft.
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