Firing interval is defined as the interval between what events?

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Multiple Choice

Firing interval is defined as the interval between what events?

Explanation:
Firing interval refers to the angular separation, measured in degrees of crankshaft rotation, between ignition events of successive cylinders. In a four-stroke engine, there are as many ignition events in a 720-degree crankshaft rotation as there are cylinders, so the average interval is 720 degrees divided by the number of cylinders. For example, a four-cylinder engine fires every 180 crankshaft degrees, while a six-cylinder engine fires every 120 degrees. This timing is about crank angle, not time or piston travel. It’s not the time between spark plug firings, not the piston movement from induction to compression, and not the interval between exhaust strokes.

Firing interval refers to the angular separation, measured in degrees of crankshaft rotation, between ignition events of successive cylinders. In a four-stroke engine, there are as many ignition events in a 720-degree crankshaft rotation as there are cylinders, so the average interval is 720 degrees divided by the number of cylinders. For example, a four-cylinder engine fires every 180 crankshaft degrees, while a six-cylinder engine fires every 120 degrees. This timing is about crank angle, not time or piston travel. It’s not the time between spark plug firings, not the piston movement from induction to compression, and not the interval between exhaust strokes.

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