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JohnF
Joined: 13 May 2010
Posts: 124
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 Posted: Thu May 27, 2010 2:08 pm Post subject: CHT on new Rotax |
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Has anyone noticed if Rotax engines might show a higher than normal CHT when new as Lycomings and Continentals do before full breakin? I see a few degrees higher than normal (as I now recall that is 248F) after about 5 minutes of so of ground running at 2000RPM.
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lgold(at)quantum-associat
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| Posted: Wed Jun 09, 2010 3:03 pm Post subject: CHT on new Rotax |
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John,
The CHT reads water temp, and 248 is very high. I did not experience CHTs going down over time, but did have a very high CHT when I first installed my engine because I left a (almost hidden) plastic cap over the water pump inlet.
Les
From: owner-rotaxengines-list-server(at)matronics.com [mailto:owner-rotaxengines-list-server(at)matronics.com] On Behalf Of John Fasching
Sent: Thursday, May 27, 2010 3:08 PM
To: rotaxengines-list(at)matronics.com
Subject: CHT on new Rotax
Has anyone noticed if Rotax engines might show a higher than normal CHT when new as Lycomings and Continentals do before full breakin? I see a few degrees higher than normal (as I now recall that is 248F) after about 5 minutes of so of ground running at 2000RPM.
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capedavis(at)yahoo.com
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| Posted: Wed Jun 09, 2010 3:42 pm Post subject: CHT on new Rotax |
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Rotax engines listers, Just checking is anyone using the Rotax vtwin 990 engine ? I just watched the video on the" Can Am",spyder what a machine !
Chris Davis
KXP 503 492 hrs
Glider Pilot
Disabled from crash building Firefly
From: Les Goldner <lgold(at)quantum-associates.com>
To: rotaxengines-list(at)matronics.com
Sent: Wed, June 9, 2010 6:20:19 PM
Subject: RE: CHT on new Rotax
John,
The CHT reads water temp, and 248 is very high. I did not experience CHTs going down over time, but did have a very high CHT when I first installed my engine because I left a (almost hidden) plastic cap over the water pump inlet.
Les
From: owner-rotaxengines-list-server(at)matronics.com [mailto:owner-rotaxengines-list-server(at)matronics.com] On Behalf Of John Fasching
Sent: Thursday, May 27, 2010 3:08 PM
To: rotaxengines-list(at)matronics.com
Subject: RotaxEngines-List: CHT on new Rotax
Has anyone noticed if Rotax engines might show a higher than normal CHT when new as Lycomings and Continentals do before full breakin? I see a few degrees higher than normal (as I now recall that is 248F) after about 5 minutes of so of ground running at 2000RPM.
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flyadive(at)gmail.com
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| Posted: Wed Jun 09, 2010 3:42 pm Post subject: CHT on new Rotax |
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Les:
IF the probe you are using for CHT is in the Radiator and is reading
the "Water Temp" AND you are reading 248 F you have problems.
Check a few things:
1 - Do a pressure check of the water / radiator system. A SEALED
radiator should NOT go above 211 F. And 180 to 200 is more in line of
what it should be.
2 - Are you using an Anti-Freeze? YES you should be especially in the
summer, not just the winter.
3 - Where is the location of the probe? It sounds like it may be
reading CHT .. Or a combo of CHT & Water Temps.
4 - Check your Timing.
5 - What and How is your OIL Temps?
6 - Crazy question - Did you remove ALL cowl plugs and anti-bird plugs?
OK, that is all I can think of right now.
Barry
On Wed, Jun 9, 2010 at 6:20 PM, Les Goldner
<lgold(at)quantum-associates.com> wrote:
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Roger Lee
Joined: 10 Jan 2006
Posts: 1464
Location: Tucson, Az.
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| Posted: Fri Jun 11, 2010 5:55 pm Post subject: Re: CHT on new Rotax |
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248F is fairly hot for a 2000 rpm 5 min. run.
I would check my oil and coolant hoses for kinks. I take it you did an oil purge before the first run? Even if there was no air flow 248F at 2000 for 5 min. is on the high side. My gut feeling is it is something with the two flows above.
There are a lot of variables here. Things like type of plane, cowling, prop setup, fluid types ect... You would need to know a whole lot more to diagnose this a little better.
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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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