Which engine has more thermal efficiency 2 stroke or 4 stroke?

Relatively 2 stroke engine of same physical size with 4 stroke engine, produces higher amount of power than that by 4 stroke engine. But in term of thermal efficiency, 2 stroke engine are considered less thermal efficient than 4 stroke engine.

Which stroke engine has higher thermal efficiency?


S.No. Four-stroke engine
9. These engines are water-cooled.
10. Less fuel consumption and complete burning of fuel. Hence more thermal efficiency.
11. The engine requires more space.
12. Complicated lubricating system.

Why thermal efficiency of 4 stroke engine is more than 2 stroke engine?

As far as efficiency goes, the 4-stroke certainly wins. This is due to the fact that fuel is consumed once every 4 strokes. Four-stroke engines are heavier; they weigh upwards of 50% more than a comparable 2stroke engine.

Which engine has maximum thermal efficiency?

A Carnot engine operating between two given temperatures has the greatest possible efficiency of any heat engine operating between these two temperatures.

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What is the thermal efficiency of 2 stroke engine?

The results showed that a maximum brake thermal efficiency of 47.2% can be achieved for the two-stroke BUSDIG engine with lean combustion and water injection.

What is the difference between 4-stroke and 2?

The main difference between a 2- and 4-stroke engine is that a 4-stroke engine goes through four stages, or two complete revolutions, to complete one power stroke. A 2-stroke engine goes through 2 stages, or one complete revolution, to complete one power stroke.

What is the efficiency of 4-stroke engine?

The four-stroke diesel engine has been used in the majority of heavy-duty applications for many decades. It uses a heavy fuel containing more energy and requiring less refinement to produce. The most efficient Otto-cycle engines run near 30% thermal efficiency.

Why is the efficiency of a 2-stroke SI engine less than that of a 4-stroke SI engine?

Hence, the compression ratio of this engine is lower than that of a four-stroke engine of the same dimensions. As the efficiency of an engine is directly proportional to its compression ratio, the efficiency of a two-stroke cycle engine is lower than that of a four-stroke cycle engine of the same size.

Which is better 2 or 4-stroke outboard?

4-Stroke Outboards Pros

The fuel efficiency of a 4-stroke motor can be 50% better than that of a 2-stroke motor with the same HP. As for environmental concerns, 4 stroke outboards produce far less harmful emissions, which can be as much as 90% cleaner than those from a similar sized 2-stroke motor.

Which is better 2-stroke or 4-stroke dirt bike?

While a 2-stroke will never offer the torque of a 4-stroke, they come close enough for most weekend riders. Not only that, but they’re lighter and tend to be easier to handle, which makes them great for beginners. In addition, 2-stroke bikes require less maintenance than most 4-strokes, saving you time and money.

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Which cycle has the highest thermal efficiency?

The Carnot cycle, due to its fully reversible nature, represents the highest cycle efficiency possible for the two temperature limits of TH and TL; where TH represents both the heat source temperature and the temperature of the working fluid, and TL is both the working fluid temperature and the temperature of the heat …

Which of the following has the least thermal efficiency?

Steam engine has the least thermal efficiency as some of the heat is lost in warming the vessel.

Why are two-stroke engines more efficient?

The higher fuel consumption of a two stroke engine is mostly due to the fact that it has a power stroke per revolution of the crankshaft.

How can you increase the efficiency of a 2-stroke engine?

First, an electric turbocharger allows for “variable compression ratio,” whereby the inlet pressure fed into the engine’s cylinders is varied to maximize efficiency. Second, an approach called asymmetrical port timing–opening the intake and exhaust ports at different times–helps improve the efficiency of gas exchange.

How many Pistons are in a 4-stroke engine?

A four-stroke cycle engine is an internal combustion engine that utilizes four distinct piston strokes (intake, compression, power, and exhaust) to complete one operating cycle.