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The power developed in a 4-stroke engine is based on formula, Power = PLAN/2, where,
P is mean effective pressure inside cylinder, L is stroke length of piston travel, A is cylinder bore or area of piston top, N is number of revolutions per unit time.
In a 2-stroke engine, because power is developed in same revolution, formula for Power becomes, P = PLAN
This means that with same mean effective pressure, stroke length and bore (area), 2-stroke engine can develop twice power of a 4-stroke engine!
If size, weight, and material cost are causes for concern, 2-stroke engine has clear advantage.
Well folks, 2-strokes have advantage of higher power with small size. However, there are some disadvantages too. That could be discussed later...
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