The difference between the two-stroke and four-stroke engine cycles lies in the movement of the crankshaft and piston. In the article, let us learn more differences between two-stroke and four-stroke.

Table of Contents:

What Is a Two-Stroke Engine?

A two-stroke engine is an engine that completes a power cycle with two strokes of the piston during only one crankshaft revolution.

What Is a Four-Stroke Engine?

A four-stroke engine is an internal combustion engine in which the piston completes four separate strokes while turning the crankshaft.

Two-Stroke vs Four-Stroke

Difference Between Two Stroke and Four Stroke

Two Strokes

Four Strokes

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.
It uses a port for the fuel’s outlet and inlet. It uses valves for the fuel’s outlet and inlet.
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 to manufacture. Engines are expensive due to lubrication and valves and are tough to manufacture.
Engines are basically lighter and noisier. Engines are basically heavier because their flywheel is heavy and less noisy.

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Frequently Asked Questions – FAQs

Q1

Which stroke engine is lighter in weight?

A two-stroke engine is lighter.
Q2

Less wear and tear occurs in which type of engine?

In a four-stroke engine, less wear and tear takes place.

Q3

Which engine has two revolutions of the crankshaft during one power stroke?

The four-stroke engine has two revolutions of the crankshaft during one power stroke.
Q4

Which engine is more noisy?

Two-stroke engines are noisy.

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