2 comments
1. the injection 'juice' was a h2o and alcohol mixture.
2. the old re: Shelby Mustangs used those a/c compressor lookin'
superchargers ....and Oh!
3. according to Carroll Shelby "if you got turbo lag you ain't drivin' it
right!!"
HoYo
original owner1986 Shelby GLHS
Turbo Intercooled(Omni) 109,000 miles/ one 1/4 mile at the time!!
----- Original Message -----
From: "Matt Junker" <junkman923@earthlink.net>
To: "David Kernberger" <dkern@napanet.net>; <mgb-v8@autox.team.net>;
<buick-rover-v8@autox.team.net>
Sent: Wednesday, March 12, 2003 11:33 PM
Subject: Re: F-85 jetfire article
> > One interesting item was the contention of the author that a
> > turbocharger is NOT a supercharger. Anybody care to get into a
discussion
> > on that issue?
>
> I've been lurking for a while and saw an opportunity to jump in here.
>
> The turbocharger uses exhaust gas to turn a compressor to fit more air and
> fuel into the cylinder, as stated in another reply.
>
> The usual type of supercharger that people are familiar with is in
dragsters
> -- the big chrome case that looks vaguely like a small beer keg lying on
its
> side where an intake manifold usually is.
>
> Also, the big belt driving the extension out the front of the "keg" tells
> you how it gets its power.
>
> I think some of the advantages and disadvantages of each can be spelled
out
> like this:
>
> A supercharger I believe is cheaper in terms of installation and purchase,
> and "kicks in" earlier in the rpm meter. The downside is is it "costs"
more
> in terms of energy to drive the belt, even when it's doing little good.
>
> These days you have more choices than the big `ol Roots type on dragsters.
> There are superchargers that are installed on Mustangs these days which
take
> up only a bit more room than all the usual air conditioner junk.
>
> The turbocharger uses the somewhat more "free" energy of exhaust gas to
turn
> the compressor, but you have to replumb more of the engine to run one.
Also,
> heat becomes such a problem in the engine bay that some of the benefit of
> turbocharging is lost to hot (and therefore less dense) intake air.
>
> The turbocharger also "lags" more in the acceleration department, but
comes
> on like gangbusters.
>
> An interesting aside about the olds model that's being discussed here is
> that they didn't completely have the knock problem at high compression
> licked at the time because they were almost 30 years from computerized
fuel
> injection.
>
> So, to combat the problem of early detonation, I believe they injected a
> mixture of water and oil below the carb at some (possibly all) operating
> range to keep the knock to a minimum.
>
> Hope this helps answer your questions,
> Matt
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