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23 September, 17:34

How does the clearance volume affect the efficiency of the Otto cycle?

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  1. 23 September, 18:52
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    A smaller clearance volume means a higher compression. A higher compression means better thermal efficiency. However a compression ratio too high might be troublesome, as it can cause accidental ignition of the fuel-air mix. This is the reason why Otto cycle engines have lower compressions that Diesel engines. In a Diesel engine the mix ignites by compression instead of a spark.
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