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Hi CHT on the Rotax 912uls

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Rich L

Joined: 23 Feb 2008
Posts: 63
Location: North Idaho

Posted: Wed Jun 12, 2013 3:25 pm Post subject: Hi CHT on the Rotax 912uls

A lot has been said about the 912uls cooling. I have had CHT temps over 240 degF for over 2 years in the summer. Not to red line but Not Comfortable to fly any distance with. I have over 1100 hours on my Kitfox S7 and my Evans "lifetime" coolant and was ready for a change. I read an article, (I think by Roger) about using 50/50 Antifreeze instead of Evans would reduce bring the temps by 25 to 30 degrees. 



It works!!!! My CHT and Coolant Temp are down 25 degrees today with the same OAT as when they were in the 240 range. I am ready to take a summer trip again. BTW, I chose Prestone DexCool (Orange).  Thanks Roger

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_________________
Rich Little
N812RL S-7 912ULS
North Idaho
Kiev Prop

Roger Lee

Joined: 10 Jan 2006
Posts: 1464
Location: Tucson, Az.

Posted: Wed Jun 12, 2013 7:17 pm Post subject: Re: Hi CHT on the Rotax 912uls

Your Welcome. 

Evans isn't a bad coolant it just comes with a temp penalty. I wouldn't use it unless my engine was an open air engine. These newer tight cowled aircraft just don't help out much for cooling. To help keep down radiated and convective heat on the inside of the cowl on all the hoses and wiring you can use some header wrap on the exhaust pipes from the head down and under the springs. Many of us have been doing this for 10+ years without any issues. The header wrap can be purchased from most automotive stores.

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_________________
Roger Lee
Tucson, Az.
Rotax Instructor & Rotax IRC
Light Sport Repairman
Home 520-574-1080 TRY HOME FIRST
Cell 520-349-7056

KeysFox

Joined: 05 Jan 2009
Posts: 137

Posted: Thu Jun 13, 2013 4:43 am Post subject: Hi CHT on the Rotax 912uls

In a related matter, I have a Kitfox IV with 912 that has dual coolant

temp sending units  and matched UMA gauges. The sending unit mounted in

the coolant line (supplied by Lockwood) reads about ten degrees cooler

than the sending unit and gauge combination mounted in the cylinder head.

I have switched wires between sending units and gauges just to make sure

there is not a discrepancy between sending units and gauges.

BJ Kitfox IV 80 hp 912

 	  Quote: 	
		   



 A lot has been said about the 912uls cooling. I have had CHT temps over

 240 degF for over 2 years in the summer. Not to red line but Not

 Comfortable to fly any distance with. I have over 1100 hours on my Kitfox

 S7 and my Evans "lifetime" coolant and was ready for a change. I read an

 article, (I think by Roger) about using 50/50 Antifreeze instead of Evans

 would reduce bring the temps by 25 to 30 degrees.



 It works!!!! My CHT and Coolant Temp are down 25 degrees today with the

 same OAT as when they were in the 240 range. I am ready to take a summer

 trip again. BTW, I chose Prestone DexCool (Orange).  Thanks Roger



 --------

 Rich Little

 N812RL S-7 912ULS

 North Idaho

 Kiev Prop





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 http://forums.matronics.com/viewtopic.php?p=402577#402577

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_________________
B Jones
N154K
443-480-1023

Roger Lee

Joined: 10 Jan 2006
Posts: 1464
Location: Tucson, Az.

Posted: Thu Jun 13, 2013 5:40 am Post subject: Re: Hi CHT on the Rotax 912uls

There will be a few degrees difference. One is reading the actual water temp at that specific point and the other the metal temp at a totally different point. Rotax considers anything like your 10 degrees to be more or less the same. A lot of people don't have coolant temp gauges, but because the coolant and CHT's are so close you can just use the CHT for the coolant temp and be reasonably close.

- The Matronics RotaxEngines-List Email Forum -

Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

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_________________
Roger Lee
Tucson, Az.
Rotax Instructor & Rotax IRC
Light Sport Repairman
Home 520-574-1080 TRY HOME FIRST
Cell 520-349-7056

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