Difference Between Two Stroke and Four Stroke

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

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.

Difference Between Two Stroke and Four Stroke

Two Stroke

Four Stroke

It has one revolution of crankshaft during one power stroke

It has two revolution of crankshaft during one power stroke

It generates high toque

It generates less torque

Its uses ports for fuel’s outlet and inlet

It uses valves for outlet and inlet of fuel

Its engines results in lesser thermal efficiency

Its engines results in higher thermal efficiency

It has larger ratio in terms of power to weight

It has lesser ratio in terms of power to weight

It generates more smoke and show less efficiency

It generates less smoke and show more efficiency

Requires more lubricating oil as some oil burns with the fuel

Requires less lubricating oil

Due to poor lubrication, more wear and tear occurs

Less wear and tear occurs

Engines are cheaper and are simple for manufacturing

Engines are expensive due to lubrication and valves and are tough to manufacture

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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