![]() Less output due to mixing of fresh charge with the hot burnt gases. More output due to full fresh charge intake and full burnt gas exhaust. ![]() More mechanical efficiency due to less friction on a few parts. Less mechanical efficiency due to more friction in many parts. Engine design is simple due to the absence of valve mechanism. Engine design is complicated due to the valve mechanism. A lighter flywheel is required and the engine runs balanced because the turning moment is more even due to one power stroke for each revolution of the crankshaft. A heavy flywheel is required and the engine runs unbalanced because the turning moment on the crankshaft is not even due to one power stroke for every two revolutions of the crankshaft. It has one power stroke for each revolution of the crankshaft. It has one power stroke for every two revolutions of the crankshaft. Difference Between 2-Stroke and 4-Stroke Engines S.No.
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