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How is the frequency of firing in a two-stroke concerning the value of four-stroke engines?

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in Automotive Engine Design by (137k points)
How is the frequency of firing in a two-stroke concerning the value of four-stroke engines?

(a) Same as the value of four-stroke

(b) Twice the value of four-stroke

(c) Has no relationship with four-stroke

(d) Four times the value of four-stroke

This question was posed to me in an online quiz.

The doubt is from Conventional Ignition System topic in chapter Conventional Ignition System of Automotive Engine Design

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Right option is (b) Twice the value of four-stroke

The best I can explain: The frequency of firing in the two-stroke engine is twice the value for four-stroke engines. Therefore expected spark plug life in a motorcycle with two-stroke engines is only half the life in case of cars that always have four-stroke.

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