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Friction or Coulomb* loss is independent of sliding rate.
However, the friction loss in pounds, when multiplied by rate, yields hp.
As rpm goes up, so does the friction hp. Also, as rpm goes up, engine power, at
a given MEP, also goes up proportionatly. It would seem that the friction hp
would maintain a certain percentage of the overall power input, and I'm not sure
how this would cause a change in SFC. Also, I'm not sure of the effect of
increased MEP on the coefficient of friction. Does it go up with the
increased pressure of the rings against the cylinder walls at higher MEP?
Keeping MEP max certainly cuts down on pumping loss! I seek
enlightenment!
*Charles Augustin de Coulomb
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