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Distilled water can be very corrosive. “Pure, 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. Alex Madsen -----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,
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. 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. My goal
would be to use as little coolant as possible, to get freeze protection
down to maybe 20 degrees. Less coolant also means better heat transfer,
which is another reason to use as little as possible.
I could swear that I've seen a chart that tells the percentage of
coolant vs freeze level, but now I can't find such a chart. On the
manufacturers pages, they seem to want you to stay between 50 and 70
percent coolant. I never saw them recommend less than 50%, and one page
even said that you needed at least 50% for corrosion protection.
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. Hey, it could
happen :-)
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?
Thanks,
Rusty (Southbound in 5 days)
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