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mike
Joined: 11 Dec 2011
Posts: 1
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 Posted: Wed Jun 20, 2012 1:18 pm Post subject: High EGTs when Climbing |
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Hi
Have Rotax 80hp UL, experiencing high EGTs when climbing. Today outside temp 85F.
One EGT 1605F the other 1565F. Oil and cylinder temps in normal range. Water temp
also in normal range. If I lower the A/C nose and reduce the power the EGTs drop to top of
the normal range.
Is it ok to continue climbing with high EGTs if oil, cylinder head, and water temps are in normal range?
Thanks, Mike
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Roger Lee
Joined: 10 Jan 2006
Posts: 1464
Location: Tucson, Az.
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| Posted: Wed Jun 20, 2012 2:25 pm Post subject: Re: High EGTs when Climbing |
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Hi Mike,
The EGT's typically are the more stable temps in climb compared to all the others like oil and coolant because it is more regulated by fuel consistency and not as subjected to air flow like coolant or oil with air passing over the radiator. I would do some checking on all temps and sensors before I would believe everything is okay except the EGT's.
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_________________
Roger Lee
Tucson, Az.
Rotax Instructor & Rotax IRC
Light Sport Repairman
Home 520-574-1080 TRY HOME FIRST
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BARRY CHECK 6
Joined: 15 Mar 2011
Posts: 738
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| Posted: Wed Jun 20, 2012 2:28 pm Post subject: High EGTs when Climbing |
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Hi Mike:
It does not make sense to climb at an angle that produces high temps. The heat has to go somewhere and that put stress on cylinders and cooling systems and of course the exhaust system that directly has to handle the higher temps. If all it takes is a lower AOA then just do it. You will be saving the engine.
Don't even start with a high AOA, keeping FULL POWER in is OK as long as there is air for cooling. Rase the nose and your air diminishes. And you problems begin to increase.
Also remember - Heat is a LAGGING device, just like the Temp Gauge. By the time you see Red Line the temps are ABOVE RED LINE. Just like Air Speed... By the time you see an Indicated Air Speed the true air speed is past that point.
Barry
On Wed, Jun 20, 2012 at 5:15 PM, michael baker <mbee1(at)mac.com (mbee1(at)mac.com)> wrote:
[quote]--> RotaxEngines-List message posted by: michael baker <mbee1(at)mac.com (mbee1(at)mac.com)>
Hi
Have Rotax 80hp UL, experiencing high EGTs when climbing. Today outside temp 85F.
One EGT 1605F the other 1565F. Oil and cylinder temps in normal range. Water temp
also in normal range. If I lower the A/C nose and reduce the power the EGTs drop to top of
the normal range.
Is it ok to continue climbing with high EGTs if oil, cylinder head, and water temps are in normal range?
Thanks, Mike
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rampil
Joined: 04 May 2007
Posts: 870
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| Posted: Thu Jun 28, 2012 7:39 am Post subject: Re: High EGTs when Climbing |
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Are you sure your gauge is accurate? Experimental (cheap, non-TSO)
analog gauges are probably no better than ± 15%. The sensors themselves
are pretty bullet-proof, but a cheap high-sensitivity voltmeter is a weak
link
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