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rowlandcarson(at)gmail.co
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 Posted: Sun May 15, 2016 10:14 am Post subject: coolant choce and temperature monitoring questions |
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I thought I’d got all the instrumentation I needed sorted out, but I’ve come across the following items in the Rotax Installation Manual:
"2 different types of coolant are permitted.
Type 1:
- Conventional coolant based on ethylene glycol
Conventional coolant is recommended as it is commonly available and has a greater thermal heat transfer capability.
. . .
Permanent monitoring of coolant temperature and cylinder head temperature is necessary.
Type 2:
- Waterless coolant based on propylene glycol
Waterless coolant is recommended if the design of the aircraft can not maintain the coolant temperature limit.
. . .
Permanent monitoring of cylinder head temperature is necessary.
Additional monitoring of the actual coolant temperature is possible but not necessary for waterless coolant.”
I seem to recall that Evans (waterless) coolant was the flavour of the month some time back, and then it fell out of favour. I understand it's more expensive than ethylene glycol coolants as well as causing the engine to run hotter (because it doesn’t transfer heat so well).
However, it appears from the above Rotax manual extracts that if one wants to use the cheaper ethylene glycol option, it’s necessary to have a coolant temperature gauge as well as the CHT monitoring. And elsewhere in the manual coolant temp monitoring is required during the test flying period even with waterless coolant.
So, the question is - what do folks in UK generally use in the coolant system? And if conventional ethylene glycol, what type of coolant temperature sensor do they have and where is it fitted?
All advice born of experience welcome.
in friendship
Rowland
| Rowland Carson ... that's Rowland with a 'w' ...
| <rowlandcarson(at)gmail.com> http://www.rowlandcarson.org.uk
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steven.pitt2(at)ntlworld.
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| Posted: Sun May 15, 2016 1:48 pm Post subject: coolant choce and temperature monitoring questions |
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I've used Evans from the start and never had a problem. (touch wood).
You are right in saying it was flavour of the month but seems that the
glycol mix is now the recommended way to go.
Best wishes,
Steve
G-SMDH - back in the air today!!!!!
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Paul M 383
Joined: 19 Mar 2012
Posts: 97
Location: United Kingdom
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| Posted: Mon May 16, 2016 1:15 pm Post subject: Re: coolant choce and temperature monitoring questions |
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I used the Skydrive coolant temp kit, repositioning one of the 2 fitted CHT senders for use in the M10 threaded tube. The CHT sockets on my 912S are blind, so I could remove one without creating a leak - check yours, or just buy an additional sender for use in the coolant kit!
I have the carb heat kit, so needed the Adapter 3 (sort of double T piece - see picture) to take off both the carb heat and the temp probe.
http://www.skydrive.co.uk/products.asp?cat=67
It makes sense when you see the parts. Holler if it's not clear, although Mark (Mick?) at Skydrive is v helpful and will talk you through the options.
HTH
Paul M 383
XS Mono 912S
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budyerly(at)msn.com
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| Posted: Mon May 16, 2016 1:22 pm Post subject: coolant choce and temperature monitoring questions |
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Rowland,
I place the coolant overflow on the starboard side and it is accessible
through the oil door on the XS.
Glycol is my choice in the hot climate of Florida. In cool climates Evans
is fine.
Rotax requires coolant outflow to be monitored as the owner who chooses to
run at 275 will boil glycol in the head. New engines have new heads and
coolant monitoring.
I find the in line coolant temp probe to be more of a pain and inaccuracies
than it is worth. Don't let the cylinder head temp go above 245F and the
coolant never boils over.
Because Evans has nearly 20% less heat transfer ability, it is essential to
optimize your cooling or enlarge the radiator in hotter climates. Good news
is, Evans is lifetime and frankly, it does not appear to corrode as
water/glycol can.
In the UK you should be fine with a 912S, even on long taxis and hard climbs
at 90 KIAS provided you paid attention to your ducting.
Best Regards,
Bud Yerly
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rowlandcarson(at)gmail.co
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| Posted: Tue May 17, 2016 6:09 am Post subject: coolant choce and temperature monitoring questions |
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On 2016-05-16, at 22:15, Europaul383 <europaul383(at)hotmail.com> wrote:
| Quote: | I used the Skydrive coolant temp kit, repositioning one of the 2 fitted CHT senders for use in the M10 threaded tube. The CHT sockets on my 912S are blind, so I could remove one without creating a leak - check yours, or just buy an additional sender for use in the coolant kit!
I have the carb heat kit, so needed the Adapter 3 (sort of double T piece - see picture) to take off both the carb heat and the temp probe.
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Paul - thanks, that is very helpful. I have the Skydrive carb heat kit too. I was trying to figure out how to monitor a 3rd temp sensor as my MGL instrument only has 2 NTC inputs, but I guess the answer might be to monitor the coolant and only the higher of the 2 CHTs.
in friendship
Rowland
| Rowland Carson ... that's Rowland with a 'w' ...
| <rowlandcarson(at)gmail.com> http://www.rowlandcarson.org.uk
| Skype, Twitter: rowland_carson Facebook: Rowland Carson
| pictures: http://picasaweb.google.com/rowlandcarson
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paul.the.aviator(at)gmail
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| Posted: Thu May 19, 2016 10:34 am Post subject: coolant choce and temperature monitoring questions |
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Rowland,
I went to the trouble to remove the coolant bottle, welded an aluminum plate to it to make it thick enough so I could cut a thread in it to mount the sensor in the bottle.
Although I haven't had any issues with this Bud is correct, the bottom line is the head temperature.
As to Evans coolant, I never could make it work and I went back to the original coolant.
Paul
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