Question

2- What is brake thermal efficiency of diesel engine? Why thermal efficiency of 4 stroke engine is more than 2 stroke engine?​

Answer 1

Explanation:

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Answer 2

Answer:

I think 2 stroke, because while both can be modeled with the Otto Cycle, the 4-stroke model requires the addition of two more processes, the exhaust and the intake (isobaric compression and isobaric expansion), both of which have their own thermal cost. Of course, thermal efficiency is also a product of time, temperature and turbulence, and in general four-stroke engines usually beat two-strokes in this department, the increased control of the combustion cylinder that a four-stroke has can maximize thermal efficiency per unit fuel.

Anyway, 2-stroke engines are horrible polluters because when you run them out of their optimum power band much of the hydrocarbon in the fuel is not converted to energy and winds up in the exhaust. But they are a lot of fun to ride, they have a ridiculous amount of power in a very small displacement.