2 Stroke vs 4 Stroke Engine - How it Works | PROS & CONS

What Is the Difference Between a 2-Stroke and 4-Stroke Engine?
The main difference between a 4-stroke engine and a 2-stroke engine is that a 4-stroke engine goes through four stages, or two complete revolutions, to complete one power stroke, while a 2-stroke engine goes through 2 stages, or one complete revolution, to complete one power stroke. This means a 2-stroke engine can potentially produce twice as much power as a 4-stroke engine and also weigh less.
4-Stroke Engine
Four-stroke engines are fuel-efficient and environmentally-friendly. They operate in four steps:
1. Intake: The intake valve is open, and fuel is drawn in with a downward stroke.
2. Compression: As the piston moves upward, the fuel is compressed.
3. Power: After the fuel is compressed, it is ignited to produce the engine’s power.
4. Exhaust: The exhaust valve opens, and the exhaust gases exit the cylinder.
2-Stroke Engine
A two-stroke engine combines the compression and ignition steps on the upstroke and the power and exhaust steps on the downstroke. This process requires fewer moving parts for easier maintenance, but it does provide less torque.
The two-step process includes:
1. Upstroke (ignition/compression): The piston goes up, air and fuel enter the crankcase. The fuel-air mixture is compressed and ignited.
2. Downstroke (power/exhaust): Once the fuel is ignited, the piston is pushed down, and the exhaust is expelled.
Pros of a 2-Stroke Engine
There are many benefits to using a two-stroke engine. Some advantages include:
1. A two-stroke engine weighs less compared to a four-stroke engine and requires less space.
2. The engine’s turning movement is even since it takes one power stroke for each crankshaft revolution.
3. This engine’s design is simple due to the lack of a valve mechanism.
4. During operation, this engine creates less friction on parts and has increased mechanical efficiency.
5. This engine features a significant power boost with a high power-to-weight ratio.
6. The engine can operate at cold and hot external temperatures.
7. The engine has inlet and exhaust ports.
Cons of a 2-Stroke Engine
Using a two-stroke engine has some disadvantages such as:
1. Two-stroke engines consume more fuel, and only a small amount of fresh charges mix with gasses from the exhaust.
2. You may experience a high amount of vibration or noise during operation.
3. This engine has a shorter life span since it incurs increased wear and tear.
4. A two-stroke engine has a narrow power band, or range of speed where the engine is most efficient.
5. This engine type may become unstable while idling.
6. You may experience issues with scavenging with this engine.
7. A two-stroke engine does not burn as cleanly, leading to a higher level of air pollution than a four-stroke engine.
Applications of a 2-Stroke Engine
You can use a two-stroke engine in a variety of applications. Outdoor power equipment such as chainsaws, blowers, trimmers and hedge trimmers use a two-stroke motor. You can also use a two-stroke engine in transportation and equipment devices such as outboard motors, motorcycles or dirt bikes.
Pros of a 4-Stroke Engine
Using a four-stroke engine offers a variety of benefits. Some of these advantages include:
1. Four-stroke engines yield higher levels of torque at a lower RPM during operation.
2. A four-stroke engine only consumes fuel once every four strokes, making it a more fuel-efficient engine option.
3. Four-stroke engines give off less pollution because they do not require oil or lubricant mixed in the fuel.
4. These engines are durable and can withstand higher amounts of wear and tear.
5. You will not need additional oil with a four-stroke engine.
6. A four-stroke engine produces less noise and vibration during operation.
Cons of a 4-Stroke Engine
Four-stroke engines also have some disadvantages such as:
1. The additional components in the four-stroke design make these engines heavier compared to the two-stroke version.
2. A four-stroke engine contains more parts and valves, making repairs and maintenance more expensive.
3. Since it only receives power once every four rotations of the piston, this design is less powerful than a comparable two-stroke engine.
4. This engine design features a gear and chain mechanism, which can cause complications during maintenance.
5. A four-stroke engine requires regular maintenance, leading to an increase in costs for products and services.
Applications of a 4-Stroke Engine
Four-stroke engines are a great choice for a variety of uses, such as outdoor power equipment and vehicles. One of the most common examples of equipment powered by a four-stroke engine is a lawnmower. You can also find these engines in a 7cc RC engine to a Cat C18 diesel engine with approximately 800 horsepower.
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[@faqirhussain1579]

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[@joeysalameh5488]

good vid but if you voiced the vid urself itd be much better

[@KnowHowSci]

Thanks and I will try