i cant believe after all these years,drivetrain losses are still THEORETICAL. its crazy and frustrating at the same time,there are no real articles out there that PROVE one way or the other. We need to at least get two engines that make different power at THE SAME RPMS,dyno them on an engine dyno and install them in a car and dyno them on a dynojet with everything else being EXACTLY the same, and to make things interesting,find a way to see if higher RPM engines lose the same HP as Lower reving engines that make the same HP. (stroker vs destroked) to see if parasitic losses have more to do with RPM than the power itself.