What is The Difference Between 2 Stroke And 4 Stroke Engine?

Difference Between 2 Stroke And 4 Stroke

If you look around, nearly all the motorized devices are driven by either 2 or 4 stroke engines. These two engines have a fundamental role in our daily life. Though these engines are both inside ignitions, their working principle is diverse.

The presence of 2 strokes and 4 stroke engines are for exact reasons, which are to power some types of applications. In this article, you’ll know the difference between 2 stroke and 4 stroke engines, their applications, their working, etc. The main difference between 2 stroke and 4 stroke is that it takes two strokes to complete a power cycle. Whereas in 4 stroke engines, it takes 4 strokes of the piston to complete a power cycle.

While learning dirt bike riding, you must have knowledge about the specifications of the engines.

Before discussing the difference between these two, we must have the proper knowledge.

What Is a Two Stroke Engine?

The 2-stroke engine is defined as the power stroke is accessible for every one revolt of the crankshaft, or we can say in this engine the Piston movements only two times to get yield power. There are two ports, and that is the inlet and exhaust ports.

Due to variable pressure, these two ports are open and closed. A 2-stroke engine is simple than 4 stroke engine. In a 2-stroke engine, the oil must be mixed with the fuel. The fuel and oil mixture running through the engine lubricates the parts. However, because it is not a stated lubrication system, these engines usually wear down faster.

What Is Four Stroke Engine?

The four-stroke engine is defined as the power stroke is obtainable for every two revolutions of the crankshaft, or we can say in this engine the piston moves four times to get yield power. The four stroke engines are weighty and have to persist in an erect position to be used, so it does not work so well on lawn gear such as weed eaters or chainsaws.

These engines are more exclusive. In 4 stroke engine, the oil is contained in the crankcase, and there is typically a squish lubrication system where the oil is unconfined, and the only job of the system is to keep everything oiled.


Difference Between 2 Stroke And 4 Stroke Engines

2 Stroke Engine

  • It has one power stroke for each revolt of the crankshaft.
  • A lighter flywheel is mandatory, and the engine runs stable because the turning moment is more even due to one power stroke for each crankshaft revolution.
  • The engine is lightweight.
  • The engine’s design is meek due to the non-appearance of the valve mechanism.
  • Less cost than 4 stroke engines.
  • More mechanical efficacy due to less resistance a few parts.
  • Less output due to mixing of fresh charge with the hot seared gases.
  • The engine runs hotter. It means that the engine temperature is higher than the two-stroke engines.
  • The engine is air-cooled.
  • More fuel ingesting and a small amount of fresh charge is mixed with exhaust gases.
  • The engine needs less space.
  • Simple lubricating system.
  • The engine creates more noise.
  • The engine comprises inlet and exhaust harbors.
  • Less warm air proficiency.
  • It devours more lubricating oil.
  • More wear and tear moving parts.
  • Used in mopeds, scooters, motorcycles etc.
  • A 2 Stroke engine creates more spin at a higher RPM.
  • The 2-stroke engine produces more smoke.
  • These engines are not ecologically friendly.
  • It produces more heat.

4 Stroke Engine

  • It has one power stroke for every two revolts of the crankshaft.
  • A weighty flywheel is compulsory, and the engine turns unstable because the turning moment on the crankshaft is not even due to one power stroke for every two revolts of the crankshaft.
  • The engine is hefty in weight.
  • Engine design is complex due to the valve mechanism.
  • It is pricier.
  • Fewer mechanical efficacy due to more resistance in many parts.
  • More output due to full fresh charge intake and full seared gas use.
  • The engine runs chiller. It means that temperature runs at lower temperatures.
  • The engine may be air-cooled or water-cooled.
  • Less fuel ingesting and complete burning of fuel.
  • The engine needs more space.
  • Complex lubricating system.
  • The engine creates less clatter.
  • The engine contains an inlet and exhaust valve.
  • More warm air efficiency.
  • It devours less lubricating oil.
  • Less wear and tear of moving parts.
  • Used in cars, buses, trucks etc.
  • A 4-stroke engine creates a higher spin at a lower RPM.
  • The 4-stroke engine produces less smoke.
  • 4 stroke engines are ecologically friendly.
  • It produces less heat.
Difference Between 2 Stroke And 4 Stroke

How To Choose Which Engine Is Right For You?

The right selection of an engine for a vehicle is a very risky task. The operation of the vehicle depends on its engine. Whenever you select a 2-stroke engine or 4 stroke engine for your vehicle, keep in mind these key features that will help you for the best selection.

  1. Fuel Consumption: Fuel consumption means the fuel consumed by an engine. This is an important point to consider while choosing the best engine. High fuel consumption will prove costly for you.
  2. Engine Efficiency: The quantity of fuel energy that an engine renovates into useful work is known as engine efficiency. You must look at the efficiency of an engine before purchasing the engine.
  3. Weight: Weight should also be regarded as mandatory before buying the engine. A stroke engine is less heavy as compared to 4 strokes. You must choose the engine according to the capability of your vehicle.


We have tried our best to clarify each point about 2 stroke and 4 stroke engines in this article. Both engines are useful for vehicles. They both have their pros and cons. You can select any according to your vehicle capability and your choice. If you have still any ambiguity related to these engines, feel free to contact us. We are here to assist you in a better way.

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