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This chart is a generalization of in-cylinder combustion temperatures showing the effects of improved mixture quality as a function of "mixture motion" that also relates to flame travel. T1 is the combustion space temperature at intake valve closing, T2 is maximum temperature and T3 is the temperature at exhaust valve opening. Temperatures noted in red indicate gains in peak combustion temperatures and reductions in temperature at the time of exhaust valve opening. Not that e.g.t is reduced (at e.v.o.) Increased peak values can translate into higher cylinder pressures and power gains.