Real HP loss numbers

[BUTLER, Tom]

	Wouldn't horsepower lost to opening valves be recovered (at least to
a large degree) by valves closing?

	Tom Butler

> just estimate how much torque it takes to compress a valve spring
> multiply x 1/2 revs x # springs X length of valve travel x
> x losses in the vlave gear and add in the amount that it takes to
> move the valve train components around
> 15% sounds reasonable
> on 300 HP that would meav that another 52 HP was being eaten by the engine
> to move the valves
> 
> Clive 
> 
> >
>  
> > I wonder sometimes if people don't estimate drivetrain losses on the
> > high side because they don't want to admit that their engines aren't
> > as powerful as they want them to be.
> > 
> > Dan L
> > 
> >