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So O2 has zero of heat of formation (or enthalpy of formation). The enthalpy of a reaction is defined like this: H = Hproducts-H reactants. The enthalpy of reaction in this case, is the same as the heat of combustion. Hproducts is obtained summing the heats of formation.
IC engines: maximum temperature inside a combustion chamber and percentage of swept volume filled with charge. I have two questions related to IC engines. First one is, what will be the maximum temperature obtained inside an combustion chamber? I know it depends on the type, size, charge and many other factors but for theoretical and design heat transfer analysis what temperature can be considered as the maximum in an 100cc Engine? The second question is, consider the same 100cc engine powered by air cooled gasoline and its Stochi ratio is 14.7:1. During every intake stroke the overall sucked charge will not be equal to the Swept Volume.