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One of the reasons 4 cylinder otto cycle is desirable is the harmonics of induction and exhaust, IE the intake pulses and exhaust pulses are fairly easy to maintain a relatively smooth air flow on intake and exhaust. 2 cylinder 2 stroke would be close to the same with half the cylinders and the same number of combustion strokes.I'm not talking about the traditional 2 stroke, but the more modern fuel injected 2 strokes than do not need oil mixed in the fuel.
regards
Mech
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