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On the 360 degree engines the pistons go up and down at the same time which means it fires every 360 degrees of crankshaft rotation, but the 270 degree crankshaft is slightly offset where # 2 piston fires slightly after #1




This one is the correct answer. On the 360 the pistons rise and fall together, but fire on opposite strokes. THe 270 while following the same idea one piston is 90 behind.