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tdawson-townsend(at)auror
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 Posted: Sun Jul 03, 2011 8:22 pm Post subject: EGT probe? |
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All of the sudden, one EGT (#3) is lagging about 200 degrees behind his brothers, with no other symptoms from the engine. It's consistent despite power setting, leaning, one mag or the other. CHTs are fine, and engine is smooth.
Is there a failure mode like that for GRT EIS EGT probes?
Haven't tried swapping probes around yet, but will do that next to isolate it.
Tim D-T
N52KS
[quote][b]
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Tim Olson
Joined: 25 Jan 2007
Posts: 2872
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| Posted: Sun Jul 03, 2011 8:38 pm Post subject: EGT probe? |
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I'd check any connections on that probe wire.
Tim
On Jul 3, 2011, at 11:18 PM, "Dawson-Townsend,Timothy" <tdawson-townsend(at)aurora.aero (tdawson-townsend(at)aurora.aero)> wrote:
[quote] All of the sudden, one EGT (#3) is lagging about 200 degrees behind his brothers, with no other symptoms from the engine. It's consistent despite power setting, leaning, one mag or the other. CHTs are fine, and engine is smooth.
Is there a failure mode like that for GRT EIS EGT probes?
Haven't tried swapping probes around yet, but will do that next to isolate it.
Tim D-T
N52KS
[b]
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dlm34077(at)q.com
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| Posted: Sun Jul 03, 2011 9:15 pm Post subject: EGT probe? |
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Yes, you are about to burn off the tip; this is pretty standard for the GRT EIS probes, I burnt 4 in less than 300TT. I have since switched them all to he EI probes although still using the GRT EIS 6000.
[quote] ---
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AirMike
Joined: 27 Feb 2007
Posts: 514
Location: Nevada
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| Posted: Mon Jul 04, 2011 11:49 am Post subject: EGT probe? |
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Yea - swap it to another cylinder and check the connection. Probably going south on you. EGT's and CHT probes are a constant maintenance item. Burned 'em out about every 300 hrs on my Cessna.
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dlm34077(at)q.com
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| Posted: Mon Jul 04, 2011 12:27 pm Post subject: EGT probe? |
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depends on the quality of the probe. The Electronics International probes
have a life comparable to engine TBO. In 3000 hours of flight with Insight
supplied (Alcor?) probes I replaced 1 or 2 in my C177RG. Before I switched
to EI on the 10, I had four GRT failures in the first 300 hours. Check them
before you swap them; you will see whether it is even necessary.
---
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jesse(at)saintaviation.co
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| Posted: Mon Jul 04, 2011 2:46 pm Post subject: EGT probe? |
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Does it change like the others? Does it peak at about the right time as the others. In my testing and flying, as long as it is peaking and acting like the others, the actual number really doesn't mean much (especially if it isn't reading over 1400 all the time.
For those who have been replacing probes, with both AFS and Dynon probes, I have had to replace precious few of them. I finally replaced the whole set on N256H at about 925 hours, but it didn't really need them, they were just starting to get dirty/corroded, so I decided to replace all of them. I have to say that in about 120 probes I have installed of both CHT and EGT, I have only had maybe 3 go bad. Again, almost all of these were from Dynon or AFS, and many of them don't have over 300 hours on them, but I have had very few complaints. I wonder if it's just a quality issue with the probes GRT uses.
do not archive
Jesse Saint
Saint Aviation, Inc.
jesse(at)saintaviation.com (jesse(at)saintaviation.com)
C: 352-427-0285
F: 815-377-3694
On Jul 4, 2011, at 12:18 AM, Dawson-Townsend,Timothy wrote:
| Quote: | All of the sudden, one EGT (#3) is lagging about 200 degrees behind his brothers, with no other symptoms from the engine. It's consistent despite power setting, leaning, one mag or the other. CHTs are fine, and engine is smooth.
Is there a failure mode like that for GRT EIS EGT probes?
Haven't tried swapping probes around yet, but will do that next to isolate it.
Tim D-T
N52KS
| Quote: |
href="http://www.matronics.com/Navigator?RV10-List">http://www.matronics.com/Navigator?RV10-List
href="http://forums.matronics.com/">http://forums.matronics.com
href="http://www.matronics.com/contribution">http://www.matronics.com/contribution
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[quote][b]
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pitts_pilot(at)bellsouth.
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| Posted: Mon Jul 04, 2011 7:21 pm Post subject: EGT probe? |
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I wonder if mounting them further from the flange might increase their longevity???
Linn
On 7/4/2011 6:41 PM, Jesse Saint wrote: [quote]Does it change like the others? Does it peak at about the right time as the others. In my testing and flying, as long as it is peaking and acting like the others, the actual number really doesn't mean much (especially if it isn't reading over 1400 all the time.
For those who have been replacing probes, with both AFS and Dynon probes, I have had to replace precious few of them. I finally replaced the whole set on N256H at about 925 hours, but it didn't really need them, they were just starting to get dirty/corroded, so I decided to replace all of them. I have to say that in about 120 probes I have installed of both CHT and EGT, I have only had maybe 3 go bad. Again, almost all of these were from Dynon or AFS, and many of them don't have over 300 hours on them, but I have had very few complaints. I wonder if it's just a quality issue with the probes GRT uses.
do not archive
Jesse Saint
Saint Aviation, Inc.
jesse(at)saintaviation.com (jesse(at)saintaviation.com)
C: 352-427-0285
F: 815-377-3694
On Jul 4, 2011, at 12:18 AM, Dawson-Townsend,Timothy wrote:
| Quote: | All of the sudden, one EGT (#3) is lagging about 200 degrees behind his brothers, with no other symptoms from the engine. It's consistent despite power setting, leaning, one mag or the other. CHTs are fine, and engine is smooth.
Is there a failure mode like that for GRT EIS EGT probes?
Haven't tried swapping probes around yet, but will do that next to isolate it.
Tim D-T
N52KS
|
[b]
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Kelly McMullen
Joined: 16 Apr 2008
Posts: 1188
Location: Sun Lakes AZ
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| Posted: Mon Jul 04, 2011 7:47 pm Post subject: EGT probe? |
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I doubt it. EI specifies 1.5" from flange for their probes. I've had
no problems with them installed there.
On Mon, Jul 4, 2011 at 8:18 PM, Linn Walters <pitts_pilot(at)bellsouth.net> wrote:
| Quote: | I wonder if mounting them further from the flange might increase their
longevity???
Linn
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Kelly McMullen
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dlm34077(at)q.com
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| Posted: Mon Jul 04, 2011 8:39 pm Post subject: EGT probe? |
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that might but all probes indicate that 2"-6" is OK as long as all are the same distance. Mine are at about 2.5"; the outer shell burns off in the exhaust flame and the two electrodes make and break contact in the tube, causing a fluctuating value by 400 degrees. Have not had a problem since switching to EI probes.
[quote] ---
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