Difference Between Two Stroke And Four Stroke

Motor engines must sound alike but there are some 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

What is 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 revolutions in one power stroke in case of a 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 the crankshaft during one power stroke It has two revolutions of the crankshaft during one power stroke
It generates high torque It generates less torque
Its uses ports for fuel’s outlet and inlet It uses valves for outlet and inlet of a fuel
Its engines result in lesser thermal efficiency Its engines result in higher thermal efficiency
It has a larger ratio in terms of power to weight It has a lesser ratio in terms of power to weight
It generates more smoke and shows less efficiency It generates less smoke and shows 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 two strokes and four stroke differences. If you wish to learn out more related concepts, download BYJU’S The Learning App.

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