Real HP loss numbers

[Clarence L.Snyder]

>  So, when someone is talking about a 75hp loss, not all that loss is friction,
> otherwise our drivetrains would glow in the dark!  However, much of the loss due
> to momentum is taken up by the engine (more strain), which shows up as heat in
> the coolant and oil.
> 
>  If my physics are wrong, please correct me.
> 
>  Just my $0.02.

The indicated horsepower on an inertia dyno may indicate this as lost
power, but in fact it is not. In a sustained speed condition all the
inertia effects dissapear, and when you slow down you get the power
back. An accurate chassis dyno cannot depend on inertia alone.