3. Friction power
As shown in figure 2 (in energy form), the power transmitted to the piston by the combustion of the fuel mixture, the indicated power P i , is not entirely available on the drive shaft in the form of effective mechanical power P e . The losses corresponding to the transition between indicated power and effective power are generally referred to as friction losses P tf .
As we explained earlier, it's easier to talk in terms of mean pressure, so for friction we'll talk in terms of mean friction pressurepmf to study...
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Friction power
Heat transfer
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