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Why the length of piston in the 2-stroke engine is more when compared to the 4-stroke engine?

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Why the length of piston in the 2-stroke engine is more when compared to the 4-stroke engine?

(a) Absence of valve mechanism

(b) Missing of Power stroke

(c) It is not 4-stroke

(d) Air resistance

I had been asked this question during an interview.

I would like to ask this question from IC Engine in division Design of IC Engine Components of Automotive Engine Design

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Right option is (a) Absence of valve mechanism

The best I can explain: Due to the absence of a valve mechanism, the intake and exhaust of the 2-stroke engine have to be controlled by the piston itself. Hence, the length of the piston in a 2-stroke engine is more when compared to the 4-stroke engine.

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