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No, Evans coolant does not have the same specific heat and thermal
conductivity as water. You have to run hotter to get the benefits, and has
been pointed out on this list it is detrimental to the seals.
Using propylene glycol / water mix instead of Ethylene Glycol/water mix is
equivalent from a heat transfer prospect, but PG is less poisonous.
Bill Schertz
KIS Cruiser # 4045
----- Original Message -----
From: <daveleonard@cox.net>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Sent: Saturday, May 08, 2004 11:58 PM
Subject: [FlyRotary] Re: MPG Coolant
> Thats interesting, Marv. Does it have the same thermal conductivity and
specific heat as water?
>
> Dave Leonard
>
> >
> > I think what you're referring to is Evans NPG. We have to run it in the
> > Eagle540 because of the magnesium heads and intake manifold. It's a bit
> > pricey, at around $25/gal, and if you've had 50/50 water/anti-freeze in
the
> > system you need to 1) flush & purge the system with clean water, 2)
drain well
> > and blow out with air, then 3) use the Evans "purge" fluid that binds
with the
> > last of the water in the system. 4) Drain that and fill with NPG. We
had to
> > send back a sample of coolant after the first engine run to verify that
99% of
> > the water had been removed prior to filling... we did ok. What seems
really
> > strange is to have a recommendation from Evans that says to use a zero
psi
> > cap... although they did say it's ok to use one up to about 7psi if you
really
> > need to have a pressurized system. Interesting stuff.
> >
> > <Marv>
> >
> >
> >
> > <daveleonard@cox.net>:
> >
> > One of the guys at the airport says that "all" the subaru guys are using
> > something called MPG instead of Ethylene Glycol/water because it boils
at 290
> > without need to be pressurized.
> >
> > >> Homepage: http://www.flyrotary.com/
> > >> Archive: http://lancaironline.net/lists/flyrotary/List.html
> >
>
>
> >> Homepage: http://www.flyrotary.com/
> >> Archive: http://lancaironline.net/lists/flyrotary/List.html
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