Motor engines must sound alike but there are few difference between two stroke and four stroke engines. Since both the engines contains the same parts such as the crankshaft, piston and combustion chamber etc. The difference lies in the movement of the crankshaft and piston.
Difference Between Two Stroke and Four Stroke
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 revolution in one power stroke in case of four stroke engine. These are used in various types of motors.
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Difference Between Two Stroke and Four Stroke |
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Two Stroke |
Four Stroke |
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It has one revolution of crankshaft during one power stroke |
It has two revolution of crankshaft during one power stroke |
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It generates high toque |
It generates less torque |
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Its uses ports for fuel’s outlet and inlet |
It uses valves for outlet and inlet of fuel |
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Its engines results in lesser thermal efficiency |
Its engines results in higher thermal efficiency |
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It has larger ratio in terms of power to weight |
It has lesser ratio in terms of power to weight |
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It generates more smoke and show less efficiency |
It generates less smoke and show more efficiency |
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Requires more lubricating oil as some oil burns with the fuel |
Requires less lubricating oil |
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Due to poor lubrication, more wear and tear occurs |
Less wear and tear occurs |
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Engines are cheaper and are simple for manufacturing |
Engines are expensive due to lubrication and valves and are tough to manufacture |
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Engines are basically lighter and are noisy |
Engines are basically heavier because its flywheel is heavy and are less noisy |
These were some difference between two stroke and four stroke. If you wish to find out more, download BYJU’S The Learning App.
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