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A single cylinder engine will have one power stroke every two rotations. At 3,000 RPM it will have 1500 power strokes. A three-cylinder engine will have 3 × 1500 = 4500 power strokes per minute. Where did you go wrong? ... we have power stroke each 240°, ... OK so far. ... as we have 1500 rev. Of 720° in this rpm, ... An odd way of looking at it, but OK....


A 1 cylinder 4 stroke at 3000 rpm will have 1500 power strokes, So 1500 * 3 is 4500 power strokes. Based on a 4 stroke engine needing two crank revolutions to complete the full cycle of intake, compression, power and exhaust.


Figure 1. Silicone steel stamped lamination, stator and rotor. Image source:HS Magnets Figure 2. On their way to becoming motors.

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