Todd's sure fire blower sale - Fred,

[Clare Snyder]

----- Original Message -----
From: Bill Edgeworth <bedgew at ix.netcom.com>
To: <diy_efi at efi332.eng.ohio-state.edu>
Sent: Saturday, June 19, 1999 9:05 PM
Subject: Re: Todd's sure fire blower sale - Fred,


> >
> >
> >  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?
>
Thats only 700 ft lbs at 6000 rpm. A 1 1/2" low carbon steel bolt standard
torque limit is 1100 ft lb. For a grade 8 it is 3200 ft lbs. Handling the
800 hp required for the screw charger is a piece of cake - for  14 seconds
or so including burnout anyway.