[Shotimes] Power adder discussion

[Ron Porter]

Don, the GMC 4-71 and 6-71 superchargers were original equipment on the
early Detroit Diesel (GM-owned) two-stroke diesel engines. There is a Yahoo
Group with info on the old Detroit two-strokes, but here is an older link
with the a mention of the early Jimmy supercharger users:

http://www.reviewjournal.com/lvrj_home/2001/Oct-25-Thu-2001/sports/17296613.
html

Ron Porter 

-----Original Message-----
From: shotimes-admin@autox.team.net [mailto:shotimes-admin@autox.team.net]
On Behalf Of Donald Mallinson
Sent: Wednesday, October 01, 2003 11:55 AM
To: shotimes@autox.team.net
Subject: Re: [Shotimes] Power adder discussion


Kevin,

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!

Lesson is, if your parents are storing stuff you really 
want, then go get it!

Don Mallinson

Kevin & Cheryl Airth wrote:
> Jonathan:
> Most over the road trucks use turbos but not all. The famous Detroit
Diesel
> had/has a mechanical supercharger and this was adapted to drag racing use
> early on. These are the big blowers on the top fuel cars. But turbo's
> increase the thermal efficiency of the engine and give better fuel
economy.
> They don't consume any power from the engine but extract addition power
from
> waste exhaust heat and flow. All mechanical superchargers cost HP to run.
> Just like any engine driven accessory. Water pump, alternator, PS pump or
> supercharger. Top fuel racers have claimed it takes 250 HP or more just to
> drive the blower at top speed!
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