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dlm46007(at)cox.net
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 Posted: Sun May 16, 2010 1:51 pm Post subject: EGT probes |
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Any suggestions for long life EGT probes? I have 278 TT on my RV10 and have replaced 3 EGT probes from GRT. Failures have been on 6 then 4 (or 2) then 1. #2 failed this morning. Some are the original GRT EIS probes and some are their allegedly long life probes. I lost the third one on a trip to IL and GRT FEDEXed two "long life" probes to IL. I changed #1 and kept the spare. This morning on a local training flight, #2 failed (again?). Probes are located 2 inches below the exhaust port (specs call 2-6"). EGTs normally see high 1300 /low 1400 in cruise. takeoff and climb EGTs are 1200-1350. At altitude the LOP operation usually provided CHTs (275-325) and EGTs (1360-1410). GEM probes on a previous aircraft (TC177RG) were rated for 1650 F red line and since my normal operation was about EGTs at 1400. I replaced two probes in 29 years of ownership and 2500 hours. I have now replaced 4 GRT probes in 278 hours. I am considering a completely new set of Alcor or GEM probes
[quote][b]
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Kelly McMullen
Joined: 16 Apr 2008
Posts: 1188
Location: Sun Lakes AZ
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| Posted: Sun May 16, 2010 2:39 pm Post subject: EGT probes |
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Dave, I have almost the same exact hours on the EI fast response
probes installed in my Mooney at 1.5" from exhaust flange, per their
instructions. Haven't replace any so far.
On Sun, May 16, 2010 at 2:49 PM, DLM <dlm46007(at)cox.net> wrote:
| Quote: | Any suggestions for long life EGT probes? I have 278 TT on my RV10 and have
replaced 3 EGT probes from GRT. Failures have been on 6 then 4 (or 2) then
1. #2 failed this morning. Some are the original GRT EIS probes and some are
their allegedly long life probes. I lost the third one on a trip to IL and
GRT FEDEXed two "long life" probes to IL. I changed #1 and kept the spare.
This morning on a local training flight, #2 failed (again?). Probes are
located 2 inches below the exhaust port (specs call 2-6"). EGTs normally
see high 1300 /low 1400 in cruise. takeoff and climb EGTs are 1200-1350. At
altitude the LOP operation usually provided CHTs (275-325) and EGTs
(1360-1410). GEM probes on a previous aircraft (TC177RG) were rated for
1650 F red line and since my normal operation was about EGTs at 1400. I
replaced two probes in 29 years of ownership and 2500 hours. I have now
replaced 4 GRT probes in 278 hours. I am considering a completely new set of
Alcor or GEM probes
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_________________
Kelly McMullen
A&P/IA, EAA Tech Counselor
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coop85(at)verizon.net
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| Posted: Sun May 16, 2010 2:56 pm Post subject: EGT probes |
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It’s probably been covered, but what where your indications of a probe failure? I’ve got one on the fritz reading a constant very low temp but I don’t know if it’s the wiring or the probe gone bad. I also have the GRT setup and 450 hours TT.
Thanks,
Marcus
From: owner-rv10-list-server(at)matronics.com [mailto:owner-rv10-list-server(at)matronics.com] On Behalf Of DLM
Sent: Sunday, May 16, 2010 5:50 PM
To: rv10-list(at)matronics.com
Subject: EGT probes
Any suggestions for long life EGT probes? I have 278 TT on my RV10 and have replaced 3 EGT probes from GRT. Failures have been on 6 then 4 (or 2) then 1. #2 failed this morning. Some are the original GRT EIS probes and some are their allegedly long life probes. I lost the third one on a trip to IL and GRT FEDEXed two "long life" probes to IL. I changed #1 and kept the spare. This morning on a local training flight, #2 failed (again?). Probes are located 2 inches below the exhaust port (specs call 2-6"). EGTs normally see high 1300 /low 1400 in cruise. takeoff and climb EGTs are 1200-1350. At altitude the LOP operation usually provided CHTs (275-325) and EGTs (1360-1410). GEM probes on a previous aircraft (TC177RG) were rated for 1650 F red line and since my normal operation was about EGTs at 1400. I replaced two probes in 29 years of ownership and 2500 hours. I have now replaced 4 GRT probes in 278 hours. I am considering a completely new set of Alcor or GEM probes
- The RV10-List Email Forum utilities such as List Photoshare, and much much --> http://www.matronic=================[/b][/quote] - content also available via the Web --> http://forums.matronics.comstyle='mso-spacerun:yes'> - List Contribution Web Site style='mso-spacerun:yes'> Thank you for your generous style='mso-spacerun:yes'> -Matt style='mso-spacerun:yes'> --> http://www.matronics.com/c=[/b] [b]
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Ron.McGann(at)ausawd.com
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| Posted: Sun May 16, 2010 3:19 pm Post subject: EGT probes |
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I had a probe failure at 25hrs. Symptoms were intermittent extremes (zero to top of scale) while the engine was running/hot. Could not replicate the fault on the ground with the engine at ambient (though the temp from the dodgy probe differed from the others by a few degs) – it really looked like an intermittent connection due to engine vibe. Replaced the probe and it worked like a charm (after much investigation into the connectors).
Cheers
Ron
VH-XRM, flying in Oz
Do not archive
From: owner-rv10-list-server(at)matronics.com [mailto:owner-rv10-list-server(at)matronics.com] On Behalf Of Marcus Cooper
Sent: Monday, 17 May 2010 8:56 AM
To: rv10-list(at)matronics.com
Subject: RE: EGT probes
It’s probably been covered, but what where your indications of a probe failure? I’ve got one on the fritz reading a constant very low temp but I don’t know if it’s the wiring or the probe gone bad. I also have the GRT setup and 450 hours TT.
Thanks,
Marcus
From: owner-rv10-list-server(at)matronics.com [mailto:owner-rv10-list-server(at)matronics.com] On Behalf Of DLM
Sent: Sunday, May 16, 2010 5:50 PM
To: rv10-list(at)matronics.com
Subject: EGT probes
Any suggestions for long life EGT probes? I have 278 TT on my RV10 and have replaced 3 EGT probes from GRT. Failures have been on 6 then 4 (or 2) then 1. #2 failed this morning. Some are the original GRT EIS probes and some are their allegedly long life probes. I lost the third one on a trip to IL and GRT FEDEXed two "long life" probes to IL. I changed #1 and kept the spare. This morning on a local training flight, #2 failed (again?). Probes are located 2 inches below the exhaust port (specs call 2-6"). EGTs normally see high 1300 /low 1400 in cruise. takeoff and climb EGTs are 1200-1350. At altitude the LOP operation usually provided CHTs (275-325) and EGTs (1360-1410). GEM probes on a previous aircraft (TC177RG) were rated for 1650 F red line and since my normal operation was about EGTs at 1400. I replaced two probes in 29 years of ownership and 2500 hours. I have now replaced 4 GRT probes in 278 hours. I am considering a completely new set of Alcor or GEM probes
<pr - The RV10-List Email Forum utilities such as List Photoshare, and much much --> http://www.matronic=================
- content also available via the Web --> http://forums.matronics.comstyle='mso-spacerun:yes'> - List Contribution Web Site style='mso-spacerun:yes'> Thank you for your generous style='mso-spacerun:yes'> -Matt style='mso-spacerun:yes'> --> http://www.matronics.com/c= 0123456789012
[quote][b]
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dlm46007(at)cox.net
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| Posted: Sun May 16, 2010 3:48 pm Post subject: EGT probes |
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The present failure is a constant low value reading. about 100-150. Other failures have been erratic. For example a 900 reading followed a second later by a 1300 reading. When removed, that probe had the outer cover burnt off and the welded leads to a small thermocouple were showing . One lead was detached from the thermocouple and was intermittently touching. the exhaust gases passing by would have caused the intermittent readings. will send picture of failed lead from another computer if I find it.
[quote] ---
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dlm46007(at)cox.net
Guest
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| Posted: Wed May 19, 2010 6:01 am Post subject: EGT probes |
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I talked to Sandy and the very low reading indicates it is open and reading the temp of the internal EIS. My number two was like that and when removed was burn off to 3/8" I sent the list a picture recently. I am going to buy a set of EI quick response probes. I have been assured that they will work in place of the GRT probes (we will see). Got a good quote.
[quote] ---
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coop85(at)verizon.net
Guest
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| Posted: Wed May 19, 2010 8:25 am Post subject: EGT probes |
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Thanks, great info. Any chance you can pass on the quote you got from EI?
Thanks again,
Marcus
Do not archive
From: owner-rv10-list-server(at)matronics.com [mailto:owner-rv10-list-server(at)matronics.com] On Behalf Of DLM
Sent: Wednesday, May 19, 2010 9:59 AM
To: rv10-list(at)matronics.com
Subject: Re: EGT probes
I talked to Sandy and the very low reading indicates it is open and reading the temp of the internal EIS. My number two was like that and when removed was burn off to 3/8" I sent the list a picture recently. I am going to buy a set of EI quick response probes. I have been assured that they will work in place of the GRT probes (we will see). Got a good quote.
[quote]
---
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