Answer / sachin kango

because at the same compression ratio the CI engine proper
fuel not burned.in other case SI engine fuel burning is
complete then it is give more efficiency...............

Answer / syed minal hussain jafri

otto cycle more efficint from diesel cycle because diesel burns in high temprature and petrol burns on low temprature this is the different between chemical properties of petrol and diesel. petrol engine and diesel engine have also depend on wait ratio petrol engine are use in small automobiles while the diesel are used in heavy automobiles.have same compression ratio but chemical properties make different between one another.

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