Answer / raja

2-Stroke
because in 2-stroke - one power stroke obtained for one revelution of the crankshaft.
in 4-stroke - one power stroke obtained for two revelutions of the crankshaft.

Answer / suresh

fuel is burnt more efficiently in 4 stroke, as there is no overlap of strokes.
In 2 stroke, there is overlap of power stroke & exhaust stroke, wherein complete benefit of power stroke is not obtained. There is a little bit of power wastage.
Therefore 4 stroke engine is more efficient.

Answer / arpitakar

Mechanical efficiency is indicated power/break power brake power -frictional power =indicated power in two stories one power stroke for same frictional loss there is two power stroke

Answer / libu

2-Stroke
because in 2-stroke - one power stroke obtained for two revelution of the crankshaft.
in 4-stroke - one power stroke obtained for one revelutions of the crankshaft. 

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