[Vwdiesel] Re: [Audi-VW-Diesels] EGT temps revisited

[Nate Wall]

Here's a question: Anyone ever hear of a Sterling, or Sterling cycle, engine? I
forget the specifics, but years ago I worked for the American Trucking Association,
and at one of the truck shows the US Department of Energy put a sterling engine in
a Dodge full-size pick-up truck. I got to drive it around the block a few times at
the show. Not much power and it had a really odd sound to it.

--Nate

maded wrote:

> Nate and all,
>
> Yes, the temp drop is from taking out energy from the gas stream. Air cycle
> chillers work the same way, except the exit air is cold, real cold.
>
> I remember reading a Scientific American article years ago where a guy
> devised a compound diesel engine to extract more energy out of the fuel
> (diesels have way more air than used in combustion, that air has energy).
> He had worked very hard and finally engineered a solution but the
> complication was not worth the trouble.  This was years before turbos so he
> ended his article saying something like..."of course today we get the same
> result in a much more straightforward way, the turbocharger."
>
> --
> Ed Lowe, Seattle
> 82 Westy diesel upgrading to 1.9td
> 85 Golf diesel
> 92 Cabrio
> 97 Passat Tdi
> > From: Nate Wall <nwall at opei.org>
> >
> >
> > What causes the temp drop?
> >  gases expand as they pass through the turbo, giving up
> > energy (doing work) against the turbine. As that expansion occurrs, the temp
> > drops.
> > Remember old steam locomotives? Some of them use a smaller cylinder under the
> > primary one to expand the steam a second time (the first cylinder exhausts
> > into
> > the second) on each set of drive wheels to get greater effeciency.
> >
> >
>
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