[Shotimes] Power adder discussion

[Robert Bruce]

The 2-stroke Detroits were built in many variations.  I have worked on 4-71,
6V71, 6V53N, 6V71T, 6V92T, 6V92TA, 12V71TT, 12V92TT and 16V92TT over the
years.  Some of these had both blowers and turbos on the same engine.

V = "V" block rather than in-line
N = naturally aspirated
T = turbocharged
TT = twin turbos
A = aftercooled

Robert Bruce
93 atx



-----Original Message-----
From: shotimes-admin@autox.team.net
[mailto:shotimes-admin@autox.team.net]On Behalf Of Donald Mallinson
Sent: Wednesday, October 01, 2003 4:59 PM
To: shotimes@autox.team.net
Subject: Re: [Shotimes] Power adder discussion


Yes, it was a 6-71 supercharger, and was amazing to look at
and play with.  (I was pre-teen when I first saw it).

Thanks for the update on where they came from, guess I never
really knew for sure and was just guessing.

Don Mallinson

Kevin & Cheryl Airth wrote:
> 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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