Answer / gopal maity

Because petrol engine use spark plage. So there are no need self ignition of petrol using compressing air for increasing temp. So no need to extra energee for compress air during compression stoke.

Answer / jaydip polara

because inn petrol engine we burnt fuel by spark plug.so enough energy is generated.so we not use big flywheel.

Answer / jaydip polara

because in petrol engine the fuel is burnt by spark plug so we not use flywheel.and enough enegry is generated in petrol engine..

Answer / shashikant

Because in petro engine out of four stroke power is produced in only one stroke i.e in power stroke .So for other three stroke energy is stored in the flywheel which helps in limiting the fluctuation of speed of crank shaft in all other three strokes inlet , compression and exhaust.

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