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If a 2.0 liter 4 cylinder four stroke engine idles at 800rpm, how many times a minute does each of the 4 spark plugs fire?
So if the engine is idling at 800rpm, how many times a minute does each spark plug fire?
At 800rpm, the engine makes 800 revolutions per minute. Since each spark plug fires once every 4 engine revolutions, each spark plug will fire (800/4) = 200 times per minute.