"The 0 psi boiling point is 3750 F (1900 C)."... Sorry for the confusion in
the [ALT + 0176] degrees symbol not mapping over to the simple text of
team.net. It should read 375-degrees F and 190-degrees C, of course.
The heat capacity of water is about 4.2 J/cubic cm-K-degree. Propylene
glycol is about 2.5, ethylene glycol about 2.4. Densities are less than 5%
different, so on a volumetric basis water can carry over 60% greater heat.
This is why we normally don't run 100% antifreeze in our systems, and
probably one of the reasons our old TRs were originally instructed to run
with "clean rain water" unless it was frosty. More antifreeze isn't better.
So what's really different from the waterless coolants and running 100%
regular antifreeze? Propylene vs ethylene glycol? That doesn't seem like
much...
Don
On Sat, Sep 22, 2012 at 3:13 PM, Randall <TR3driver@ca.rr.com> wrote:
> > Q. What is Evans Waterless Coolant made of?
> >
> > A. Evans Waterless Coolants are patented synthetic non-toxic
> > liquids blended with a non-aqueous proprietary inhibitor package.
>
> ISTR that, if you poke around on their site a bit, there are instructions
> on
> how to upgrade your cooling system to work with their coolant. Higher
> viscosity means less flow (all other things being equal), and lower heat
> capacity means less heat transfer for a given flow. The higher boiling
> point may compensate for that in most cases, but who wants to run around
> with the temperature gauge on the peg?
>
> My only experiment with waterless coolant was many years ago, with a TR
> that
> had persistent overheating problems. Running pure ethylene glycol (Evans
> is
> supposedly a ethylene/propylene mix), the engine did not boil over (and the
> temp gauge was already ruined). But the experiment ended in disaster when
> the true reason for the persistent overheating became apparent. The out of
> control EGT caused an exhaust valve stem to burn through, and the valve
> head
> wound up in the crankcase along with most of the liner.
>
> I also believe that running too high a proportion of EG was a contributing
> factor to my Stag overheating and blowing a head gasket on the way home
> from
> VTR 2005.
>
> -- Randall
>
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