Power stroke each 180 degrees means 2 power strokes per revolution, so the number of power strokes is double the rps (not half), or more like 73 Hz.Pilot55 wrote:If your engine is running @ 2200 rpm you are turning 36.7 rps. on a 4 cylinder 4 stroke engine it has a power stroke every 180 degrees so the engines power frequency is 18 hz @ 2200 rpm.
However, any given cylinder produces a power stroke every 2 revolutions, which would be about 18 Hz.