If a four-stroke engine has 720 degrees per cycle and four cylinders, what is the firing interval?

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Multiple Choice

If a four-stroke engine has 720 degrees per cycle and four cylinders, what is the firing interval?

Explanation:
In a four-stroke engine, each cylinder delivers one power stroke during a full engine cycle, which spans 720 degrees of crankshaft rotation. With four cylinders firing once each per cycle, those four firings are evenly spaced around the 720-degree cycle. So the interval between successive firings is 720 divided by 4, which equals 180 degrees of crankshaft rotation. That spacing fits because eight firings (90-degree spacing) would require more cylinders or a different cycle arrangement, while two firings per cycle (360-degree spacing) would correspond to a two-cylinder engine, and 270-degree spacing would not evenly divide the 720-degree cycle into four equal parts.

In a four-stroke engine, each cylinder delivers one power stroke during a full engine cycle, which spans 720 degrees of crankshaft rotation. With four cylinders firing once each per cycle, those four firings are evenly spaced around the 720-degree cycle. So the interval between successive firings is 720 divided by 4, which equals 180 degrees of crankshaft rotation.

That spacing fits because eight firings (90-degree spacing) would require more cylinders or a different cycle arrangement, while two firings per cycle (360-degree spacing) would correspond to a two-cylinder engine, and 270-degree spacing would not evenly divide the 720-degree cycle into four equal parts.

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