What is the difference between Otto engine and Carnot engine

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ChloeYip
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What is the key difference between Otto engine and Carnot engine?
Other than it is reversible or not, it seems to me they are so similar.
Thanks.
 

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Have you looked at a PV diagram for both? What is the maximum efficiency of both cycles?
 
efficiency is max for carnot engine...
the pv diagram looks a little bit different shape.
however, why?
thanks
 

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