Difference between two-stroke and four-stroke engines?

One of the most common doubts for lay people in the world of mechanics, even for new students of this discipline, is the difference between a 2 and 4 stroke engine. In this article we present its characteristics so that you know how to clearly distinguish between these two types of motor.

The important difference between the two-stroke and four-stroke engine cycle lies in the movement of the crankshaft and piston. But there are other distinctions between them and in this article, we will explain the main differences between them.

What is a 2-stroke engine?

It is basically an engine that completes a power cycle with two strokes of the piston during a single revolution of the crankshaft.

What is a 4 stroke engine?

It is an internal combustion engine in which the piston completes four separate strokes while the crankshaft rotates.

Two-Stroke vs. Four-Stroke

In the following table you can see the main differences between a 2 and 4 stroke engine.

Two times four-stroke
You have one revolution of the crankshaft during a power stroke. You have two revolutions of the crankshaft during a power stroke.
Generates high torque. Generates less torque.
Its uses port for fuel input and output. It uses valves for the inlet and outlet of a fuel.
Their motors result in lower thermal efficiency. Their motors result in higher thermal efficiency.
It has a higher ratio in terms of power to weight. It has a lower ratio in terms of power to weight.
It generates more smoke and shows less efficiency. It generates less smoke and shows more efficiency.
It requires more lubricating oil since some of the oil is burned with the fuel. Requires less lubricating oil.
Due to poor lubrication, increased wear occurs. Less wear occurs.
Motors are cheaper and easier to manufacture. Engines are expensive due to lubrication and valves and are difficult to manufacture.
The engines are basically lighter and louder. The engines are basically heavier because their flywheel is heavy and they are less noisy.

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