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two stroke enginge: they are called so because they complete the thermodynamic cycle in two strokes; up and down.they do not have any valves to open up the ports. fuel efficiency is very low, wastage of fuel is inevitable, scavenging can prevent only very little fuel loss.flywheel needed can be smaller in comparison to the four stroke engine.here there is an extra port called the transverse port. they are mostly used in low power applications.

four stroke engine :

they are so called because they complete the thermodynamic cycle in four strokes;two ups and two downs. they have valves to open the port at the appropriate time. fuel efficiency is good as there is no wastage of fuel here. huge flywheel needed especially in 'single cylinder' four stroke engines as a single power stroke has to supply power for two ups and one downs of the piston stroke. they are mostly used in high power applications.

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