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Dynon EGT D180 Erratic

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JohnF

Joined: 13 May 2010
Posts: 124

Posted: Sun Jul 07, 2013 11:27 am Post subject: Dynon EGT D180 Erratic

One EGT reads in about correct range (+/-) 10-degrees of the other probe, but it 'jumps up and down about 10 to 20 degrees. 



I am going to replace the probe's connectors that go to the D180 and if that doesn't do it I probably will change the probe, but hesitate to spend the money if it is not really necessary.



Any suggestions?

rampil

Joined: 04 May 2007
Posts: 870

Posted: Sun Jul 07, 2013 3:56 pm Post subject: Re: Dynon EGT D180 Erratic

10 degrees is 0.1%!!  That's well below the accuracy of the Dynon

AD converter!  Set your low pass filter to more agreesive filtering

and you won't see it bobble.

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JohnF

Joined: 13 May 2010
Posts: 124

Posted: Sun Jul 07, 2013 6:14 pm Post subject: Re: Dynon EGT D180 Erratic

Rampil, thank you for the suggestion; now my problem is locate that filter in the Dynon (I guess) ... will have to break out the user's manual...



JohnF

JohnF

Joined: 13 May 2010
Posts: 124

Posted: Sun Jul 07, 2013 6:37 pm Post subject: Re: Dynon EGT D180 Erratic

Well, I don't find anything about a filter in the D180 install or user's manual.



I am not concerned about the numerical accuracy of the indication, but rather the fact the indicated temperature is jumping up and down while the sensor on the other side of the 912ULS is stable, perhaps moving up/down a degree or two at as slow rate while the 'jumpy" one hops up and down continuously ..  I could just disregard it but I keep noticing it and thought to fix it,

rickofudall

Joined: 19 Sep 2009
Posts: 1392
Location: Udall, KS, USA

Posted: Sun Jul 07, 2013 6:44 pm Post subject: Dynon EGT D180 Erratic

Swap the probe with one from another cylinder and see if the problem follows the probe. That way you know the problem is the probe.Have you made sure you have good grounds for the Dynon.

 Rick Girard



On Sun, Jul 7, 2013 at 2:27 PM, JohnF <n29cx(at)ridgeviewtel.us (n29cx(at)ridgeviewtel.us)> wrote:

  	  Quote: 	
		  --> RotaxEngines-List message posted by: "JohnF" <n29cx(at)ridgeviewtel.us (n29cx(at)ridgeviewtel.us)>

  

 One EGT reads in about correct range (+/-) 10-degrees of the other probe, but it 'jumps up and down about 10 to 20 degrees.

 

 I am going to replace the probe's connectors that go to the D180 and if that doesn't do it I probably will change the probe, but hesitate to spend the money if it is not really necessary.

 

 Any suggestions?

 

 

 

 

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Roger Lee

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

Posted: Sun Jul 07, 2013 7:12 pm Post subject: Re: Dynon EGT D180 Erratic

Dynon considers anything within 15F the same temp. If  the EGT, even if it fluctuates, is 0-20 degrees within each other then it should not be an issue.

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Thom Riddle

Joined: 10 Jan 2006
Posts: 1597
Location: Buffalo, NY, USA (9G0)

Posted: Mon Jul 08, 2013 4:29 am Post subject: Re: Dynon EGT D180 Erratic

Also, Rotax does not even specify EGT monitoring on the 912 series engines in their installation manual. Even the Diamond Katana type certificated airplane with 912-F3 does not have an EGT gauge.



Without manual mixture control there is no real need for an EGT since the Bing 64s, when properly maintained, do a good job of maintaining safe and reasonably appropriate mixtures at most density altitudes. Not as good as FI of course which the 912-Si engine results have proven, but good enough for carburetors.

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jay(at)horriblehyde.com
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Posted: Mon Jul 08, 2013 4:56 am Post subject: Dynon EGT D180 Erratic

The most important reason for having EGT's is so that you can watch the

trend of the temperatures over time; they are excellent indicators of

pending failure if you use them this way.



Jay



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BARRY CHECK 6

Joined: 15 Mar 2011
Posts: 738

Posted: Mon Jul 08, 2013 5:10 am Post subject: Dynon EGT D180 Erratic

John:



I have seen some really crazy exhaust systems being used with the Rotax engine...  I recall one on a Diamond Moto-Glider that made a 180 Deg turn.

The point being is:  Variance in EGT between planes of the same type and between cylinders on the same engine is greatly affected by Probe Location.

 Things like unequal distance from the cylinder head, sharp turns, even simple turns in one stack that are not in the other stack and of course I mentioned; peak and trough of wave formation.  But, YES, I would start with the simple checks first; connectors and as Rick said - Swap probes.  EGT is a diagnostic tool, whether you have manual control over your mixture or not, it can show trends.  If you are use to seeing 1300 F on a regular basis and all of a sudden the temp starts to drop say 200 F that is an indication of a richer (not rich) running system.  If you are running dual carbs and you see a difference in one set of cylinders - Your carbs could be going out of sync.  Even in a fuel injected engine, if a cylinder is running extra cool or extra rich that is an indication of injector or airflow issues.  

 The real issue with EGT & CHT or for that matter ANY instrumentation is COCKPIT FIXSATION - Not LQQKing out the window.  

Barry



 



On Sun, Jul 7, 2013 at 10:43 PM, Richard Girard <aslsa.rng(at)gmail.com (aslsa.rng(at)gmail.com)> wrote:

[quote] Swap the probe with one from another cylinder and see if the problem follows the probe. That way you know the problem is the probe.Have you made sure you have good grounds for the Dynon.



 

 Rick Girard



On Sun, Jul 7, 2013 at 2:27 PM, JohnF <n29cx(at)ridgeviewtel.us (n29cx(at)ridgeviewtel.us)> wrote:

   	  Quote: 	
		  --> RotaxEngines-List message posted by: "JohnF" <n29cx(at)ridgeviewtel.us (n29cx(at)ridgeviewtel.us)>

   

 One EGT reads in about correct range (+/-) 10-degrees of the other probe, but it 'jumps up and down about 10 to 20 degrees.

 

 I am going to replace the probe's connectors that go to the D180 and if that doesn't do it I probably will change the probe, but hesitate to spend the money if it is not really necessary.

 

 Any suggestions?

 

 

	




[b]

Roger Lee

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

Posted: Mon Jul 08, 2013 1:30 pm Post subject: Re: Dynon EGT D180 Erratic

Personally I like EGT's.



EGT's used properly can give some good info for performance, jetting and engine issues. They tend to read fast and give some indication on what's going on with the burn inside the cyl. CHT's on the other hand are slow and don't indicate as much because they are water cooled. The correct distance for an EGT sensor on a Rotax exhaust pipe is 100mm or 3.9" out from the head. You do need to be able to interpret what gauges are telling you and sometimes need to cross reference one gauge to another to see if what it is telling you is real or a sender only problem.

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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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