From: "Alex Madsen" <madsena@rose-hulman.edu>
To: "'Rotary motors in aircraft'" <flyrotary@lancaironline.net>
Subject: RE: [FlyRotary] coolant/water percentage?
Date: Sun, 18 Apr 2004 14:37:41 -0500
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Distilled water can be very corrosive. =93Pure, deionized water is =
looking
for ions, and it will take them out of the aluminum in your radiator"
Why are you using distilled water? Using strait distilled water is
probably a bad idea.  What is wrong with tap water? Also antifreeze only
lowers the freezing point of water it also increases its boiling point.
Antifreeze usually also contains about 2.5% anti corrosion and foaming
agents.=20

Alex Madsen=20

-----Original Message-----
From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On
Behalf Of Russell Duffy
Sent: Sunday, April 18, 2004 2:19 PM
To: Rotary motors in aircraft
Subject: [FlyRotary] coolant/water percentage?

Greetings,
=A0
Since I seem to have plenty of cooling capacity, I'm thinking that it
may be time to add some coolant to my distilled water.=A0 Since I live =
in
Florida, I don't need all that much freeze protection, so I'm doing it
mostly for the corrosion protection, and pump lubrication.=A0 My goal
would be to use as little coolant as possible, to get freeze protection
down to maybe 20 degrees.=A0 Less coolant also means better heat =
transfer,
which is another reason to use as little as possible.=20
=A0
I could swear that I've seen a chart that tells the percentage of
coolant=A0vs freeze level, but now I can't find such a chart.=A0 On the
manufacturers pages, they seem to want=A0you to=A0stay between 50 and 70
percent coolant.=A0 I never saw them recommend less than 50%, and one =
page
even said that you needed at least 50% for corrosion protection.=A0=20
=A0
I could certainly run distilled water, and water wetter in the summer,
and 50/50 mix in the winter, but I'd like to find one mixture that would
work year round, just in case I ever manage to go more than a month or
so without having to drain the water for some reason.=A0 Hey, it could
happen =A0:-)
=A0
Anyway, the real question is- what is the minimum percentage of coolant
that will protect down to 20 degrees, and will this provide all the
corrosion protection, and lubrication that the engine needs?
=A0
Thanks,
Rusty (Southbound in 5 days)
=A0
=A0