Difference between 2 stroke and 4 stroke Engine

The stroke of an engine is referred to the distance covered by the piston from the top dead center to the bottom dead center. If the piston moves two times then the engine is called two stroke if the piston moves four times then the engine is called four stroke engine.

The crankshaft’s rotation is once between two strokes. That means it completes one complete revolution in one power stroke in the case of a two-stroke engine and completes two revolutions in one power stroke in case of a four-stroke engine. 

Two StrokeFour Stroke
It has one revolution of the crankshaft during one power strokeIt has two revolutions of the crankshaft during one power stroke
It generates high torqueIt generates less torque
Its uses ports for fuel’s outlet and inletIt uses valves for outlet and inlet of a fuel
Its engines result in lesser thermal efficiencyIts engines result in higher thermal efficiency
It has a larger ratio in terms of power to weightIt has a lesser ratio in terms of power to weight
It generates more smoke and shows less efficiencyIt generates less smoke and shows more efficiency
Requires more lubricating oil as some oil burns with the fuelRequires less lubricating oil
Due to poor lubrication, more wear and tear occursLess wear and tear occurs
Engines are cheaper and are simple for manufacturingEngines are expensive due to lubrication and valves and are tough to manufacture
Engines are basically lighter and are noisyEngines are basically heavier because its flywheel is heavy and are less noisy

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