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The majority of the energy from gas is lost as heat in a piston driven engine. A piston driven engine has to convert the chemical energy of the gas into thermal energy before it can extract that energy in the form of mechanical energy via expansion of gas. Once again if all the energy in the gas were to be released at TDC that would allow the piston to extract the most amount of thermal energy possible. A faster flame front directly correlates to the speed the chemical energy is released.
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