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Ecky
There's two factors here
Obviously complete combustion is what you want
And then you have the propogation speed of this combustion
Normally all the energy from the fuel/air is not released until its already exiting the exhaust valve
If you look at the integral function of F=VxP/S from the start of the power stroke to the end, you can see that the earlier on the pressure rises (hence a faster burn) the more force you get per power stroke.
If all the fuel got burnt just a hair after tdc youd have the ideal situation.
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