For a four-cylinder engine, what is the firing interval in degrees?

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Multiple Choice

For a four-cylinder engine, what is the firing interval in degrees?

Explanation:
Firing interval is the crankshaft angle between successive power strokes in the engine. In a four-stroke engine, a full engine cycle spans 720 crankshaft degrees, and with four cylinders delivering power evenly, there are four firing events in that 720-degree span. Dividing 720 by four gives 180 degrees between fires, so the interval is 180 crankshaft degrees. If the interval were 360 degrees, there would only be two power strokes in a 720-degree cycle, which isn’t consistent with four cylinders. A 90-degree interval would imply eight events per cycle, which isn’t possible for four cylinders. A 240-degree interval wouldn’t evenly divide the 720-degree cycle into four equal parts, breaking the even firing pattern.

Firing interval is the crankshaft angle between successive power strokes in the engine. In a four-stroke engine, a full engine cycle spans 720 crankshaft degrees, and with four cylinders delivering power evenly, there are four firing events in that 720-degree span. Dividing 720 by four gives 180 degrees between fires, so the interval is 180 crankshaft degrees.

If the interval were 360 degrees, there would only be two power strokes in a 720-degree cycle, which isn’t consistent with four cylinders. A 90-degree interval would imply eight events per cycle, which isn’t possible for four cylinders. A 240-degree interval wouldn’t evenly divide the 720-degree cycle into four equal parts, breaking the even firing pattern.

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