Date:         Thu, 11 Nov 1999 09:54:06 -0500
Reply-To:     "Karl F. Bloss" <bloss@ENTER.NET>
Sender:       Vanagon Mailing List <vanagon@gerry.vanagon.com>
From:         "Karl F. Bloss" <bloss@ENTER.NET>
Subject:      Re: DM: Dead Dynos IV, Conclusion
In-Reply-To:  <3.0.5.32.19991111054921.00803c40@rockisland.com>
Content-type: text/plain; charset=US-ASCII

> >>The carbon deposit buildup that one seems are more likely gummy tars
> >>from longer molecules created in the combustion process.  That's why
> >>stuff like Marvel Mystery oil is popular...it's a solvent that removes
> >>that crap (or at least claims to).
> >>
> >>Karl and Kristina Bloss, Trexlertown, PA
>
> The tar and varnish residues are a mixture of carbon and tenacious
> volatiles. When the volatiles are all evaporated, only carbon remains.
> Once all the volatiles are gone, nothing but the most agressive acids can
> do a thing about it. Solvents can only penetrate effectively the tars
> which still have volitiles present for the solvent to penetrate.

I still don't believe it's pure carbon rather than gummy tars.

The combustion process, which certainly is not covered by equilibrium
thermodynamics (not enough time to create an equilibrium), creates, among other
things, tarry residue from burning long organic molecules (say, octane, which
is 8 carbons in a long chain along with hydrogen and one of the cleaner
molecules) with 21% O2.

Any VOCs are, by definition, volatile, thus have a high vapor pressure and are
not going to hang around the cylinder wall.

The most likely form of carbon that would be in a cylinder is graphite.
Graphite is slippery (even sold as a dry lubricant) and thus would probably not
hang around a cylinder wall either.

> Empirative evidence suggesting a proven theory of more carbon in higher
> weight strait grade Dead Dynosaur elixers.

Higher weight = higher viscosity = longer organic molecules = more empirical
gummy buildup.  No surprise there.

-Karl

Karl and Kristina Bloss, Trexlertown, PA
'87 Westfalia Weekender  "Beverley" - 189K miles
VW Mechanic list: http://www.enter.net/~bloss/vw/vwshops
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