Todd's sure fire blower sale - Fred,

[Bill Edgeworth]

>
>
>  I was curious, so I called Blower Drive Service when I bought a 6-71 a
> few years ago.  They said a stock, used blower without internal damage
> should make 12-15 PSI of boost on a 454-460 sized motor with a 1:1 drive
> ratio, and that it would take approximately 60hp to turn the blower at
> that time.  Reworked blowers with welded or Teflon-inserted rotors would
> make more boost.
>

I didn't think it would build that much ( I don't know how much heat the
stock blower would generate in the air charge) IMHO  the 12-15 psi is due to
a lot of heat in the air. With the same boost level and a reworked blower
you will make more power because the air charge is much cooler.
A number I have been told for a reworked blower with the blower turning
6000rpm and generating 15 psi boost is 100 hp. Kind of hard on that poor old
crank snout!
I have also been told that a screw charger on a modern top fuel engine
requires 800 hp at full boost and maximum rpm. I wonder what they do to the
crank snout to handle that?