| Otto Cycle
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Diesel Cycle
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| Heat addition process in an Otto cycle is a constant volume process .
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Heat addition process in a Diesel cycle is constant pressure process .
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| Otto cycle is used in petrol engines .
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Diesel cycle is used in diesel engines.
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| For the same compression ratio the efficiency of Otto cycle is more than the diesel cycle.
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For the same compression ratio the efficiency of diesel cycle is less than Otto cycle.
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| Practically , Otto Cycle is less efficient because of the problem of knocking .
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Diesel Cycle is practically more efficient due to higher compression ratios.
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