Help Needed: Effect of Fuel Burn Increase on PV Diagram

Cian1987
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i'm looking for help to a question that i have, i have tried every thing to find an answer to it. the qustion is "how would would an increase in fuel burned affect the PV daigram of a given engine.

i belief it has to do with changing of the pressure and volume figures on the PV diagram. if anybody would be able to help that would be great.
 
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What determines the volume and volume changes of an engine? How is pressure produced?
 
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