[Shotimes] Power adder discussion

[Mike.Wojton@us.o-i.com]

You're correct, the 14-71 and 16-71 were not GMC blowers.  They are
aftermarket cases made by someone else, and don't correspond to any
engine displacement designations.  They are just bigger and bigger yet!
As I understand it, original cases are getting pretty hard to come by,
and companies like BDS and B&M are getting new castings made for
the "traditional style" blowers.  Littlefield made/makes a 10-71 size
which is really just bigger displacement than the 4's and 6's.  There
was an 8-71 size that came from Detroit, I thought, but it was never
on an 8 cylinder engine.  Just bigger than the 6.  Any case bigger than
a 6 would be tough to put on a street car, as it's just too long, and 
there's
not much room left for the distributor and firewall clearance.


Mike Wojton
Toledo, Ohio

-'95 Green MTX  3/01-1/03
   ShoShop y-pipe

-'95 White MTX
   '96 Brake Upgrade

Injection is nice but I'd rather be blown.



shotimes-admin@autox.team.net wrote on 10/01/2003 01:22:34 PM:

> Yes. They are the one and the same.  An  interesting (and OT!) story 
too.
> Detroit Diesel is what's left of the GM Diesel Division started in 1937. 
Gm
> had a break though design of a 2 cycle diesel that really took off. So 
GM
> created a separate division for it. In the 50's GM came out with the 53 
and
> 71 series diesels. These numbers stand for the cubic inch displacement 
of 1
> cylinder. So if you had a 6-71 GMC. This was a 6 cylinder displacing 
(6X71)
> 426 cubic inches. These 2 stroke diesels really take to supercharging 
well
> and GM made a ton of supercharged models. About that time ( Late 50's) 
drag
> racing was getting very hot in southern California. I don't have the 
names
> and dates of who thought of this first but the GMC diesel Roots type
> supercharger was adapted to a gas V-8 and run by a belt. Not a whole lot 
has
> changed in 40 years! So even today all the roots blowers in top fuel, 
ECT
> are sized by the same GM numbering system used in 1957. I see now where 
they
> are running 14-71 and 16-71 blowers. I don't think GM ever made any in 
these
> sizes at all but the aftermarket has completely taken over the 
manufacture
> of  blowers. Like the aftermarket for custom Harley engines. Not one 
piece
> is made by Harley but they all interchange. You probably had a old 4-71 
or
> 6-71 these were the most common. The 53 size blowers did not get used 
much
> if ever.
>  Anyway the kicker I guess is that Detroit Diesel is now owned 
completely as
> of 2000 by DaimlerChrysler.
> .
> .
> 
> > The typical supercharger used on drag cars in the 50's and
> > 60's was the GMC supercharger, and to the best of my memory,
> > it was not on a diesel engine.
> >
> > I had one in my garage for a long time that my brother in
> > law got to put on his 57 Chevy, but it never made it.  Many
> > years later when my father tore that garage down to make way
> > for a new one, he didn't tell me and threw away the
> > supercharger, and a good 327 block, he also gave away all my
> > pedal cars to the guy that tore the garage down.  Those are
> > worth something today!
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