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Originally Posted by curtis73
But you're still missing my point...
Who cares about enthalpy of formation? All you see is the reaction in the chamber. Period. The only thing we need to know is BTUs for both fuels. It doesn't matter how much enthalpy you get in or out when you make or break; how many joules or BTUs get released from combusting it?
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Enthalpy of formation is useful if you're trying to pass a chemistry exam. But as a fuel the calorific value is all that matters.
Acetylene has approx 50 MJ/kg
Propane has approx 50 MJ/kg.
There is no benefit.