I don't know Blake...You must be talking about straight ethylene glycol vs.
straight water. I'd be interested to see the sources at any rate. I learned
in the '70s that 50/50 is best (ethylene glycol/water), and according to
James E. Duffy in Modern Automotive Mechanics, copyright 1985,
"Antifreeze conducts heat better than plain water (he must have been talking
about 50/50) and, therefore, cools the engine better. It is normally used in
hot weather.... For ideal cooling and winter protection from freeze up, a
50/50 mixture is usually recommended. Note: (in red print) Plain water
should NEVER be used in a cooling system or the four antifreeze functions
just discussed will not be provided." (Author's emphasis.) The four
antifreeze functions are Prevent winter freeze up, Prevent rust and
corrosion, Lubricates water pump, Cools the engine.
Now just to muddy the coolant further, I've always learned that pure
water does have a higher heat capacity than pure antifreeze, but not by that
much. Pure water is what boils at 212 F (100 C), but the moment impurities
are introduced such as salts, rust, oil residues, etc. (not in MY engine!),
the boiling "point" becomes more of a boiling "range", depending on the type
and amount of impurities. Since ethylene glycol is a calculated "impurity"
and the freezing-boiling range has been heavily researched and recommended
by all modern auto makers, the benefits of running 50/50 antifreeze are
clear for a road car. At least in my mind. Just try missing the switch when
there's an early freeze!
Best to all, Pete from Connecticut, Yippee for spring!
Pete Thiel
53 TD
----- Original Message -----
> From: <yd3@nvc.net>
> To: <mg-t@autox.team.net>
> Sent: Friday, April 08, 2005 7:53 PM
> Subject: Re: Temerature
>
>
> > <<<snip>>>
> > 50/50 Prestone
> > <<<snip>>>
> >
> > This actually excaberates the problem. Even though ethylene glycol
> > increases the boiling point of the coolant it also DECREASES the heat
> > carrying capacity. This is even worse in a non pressurized system.
> > Glycol can only carry about 75% of the BTUs that straight water can.
> > Your better off with LESS antifreeze, with pure water and a rust
> > inhibitor the best solution. I've tested it and have both emperical and
> > research proof.
> >
> > Regards,
> > Blake
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