Has anyone tried (in an airplane) any of the cooling
system heat transfer fluids, such as water wetter or
the royal purple one (both USA brand names)?
I have used water wetter in the cast iron engine & head
/ brass & copper radiator combination of a 74 MG Midget
with fair results
PS I just took delivery of most parts of stage 2 & 3
(awaiting delivery of stage 1 with manuals and other
bits), now the fun is starting
Dean Wiegand
Sacramento CA USA
dwiegand@surewest.net
kit A259
www.dwiegand.dnsalias.com
-----Original Message-----
From: forum-owner@europaclub.org.uk
Housman
Subject: Re: 2 items - service
bulletins on Rotax and
In re: glycol-water mixtures
In general, dissolving anything in water both elevates
the boiling point and
depresses the freezing point, so more glycol helps at
both temperature
extremes. However, adding glycol to water has an
adverse effect on heat
transfer so engine cooling will be adversely affected
by having higher
glycol concentration. In other words, keeping the
coolant mixture from
boiling is not the same as providing more efficient
cooling for the engine.
So, one must ask: is the cooling problem indicated by
high coolant
temperature (or boiling) or by high cylinder head or
oil temperature? The
former is helped by adding glycol, the latter by
reducing the glycol
percentage.
Best regards,
Rob Housman
A070
-----Original Message-----
From: forum-owner@europaclub.org.uk
Behalf Of Jim Brown
Subject: Re: 2 items - service
bulletins on Rotax and
Graham;
It has certainly taken Rotax long enough to address
this problem. However in
the last few months they have flooded us with Service
Bulletins and Service
Letters. Could it be the military's use of the
914?????????
I also, did not know that reducing the glycol mixture
would also reduce the
boiling point until reading the current Service Letter.
I am using 80/20
mixture here in Florida, and I must admit that with the
overheating problems
on the ground we are having, I probably will keep
things as they are.
Jim Brown
Graham Singleton wrote:
> >The overflow bottle SB914-025 only affects engine
serial #s up to S/N
> >4,420.316
> >The Service Bulletin for the 912 series is
SB-912-039
> >Jim Brown
>
> It was the overflow bottle that was the main cause of
my problems 3 years
> ago. My bottle exploded and filled the cowling with
coolant vapour. Not
> quite enough to stop the engine unfortunately. I also
didn't realize when
> we diluted from 75% glycol that 50/50 coolant mix
boils at 115 deg C in
> free air and 130 deg C at the nominal 1 Atmos.
overpressure. Should have
> checked, shouldn't I!
> Graham
>
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_______________
The Europa Forum is supported by Aviators Network UK
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In the event of problems contact
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The Europa Club website is at
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_______________
The Europa Forum is supported by Aviators Network UK
<info@avnet.co.uk>
In the event of problems contact
<forum-owner@europaclub.org.uk>
The Europa Club website is at
<http://www.europaclub.org.uk>
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