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05-21-2016, 06:18 AM
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Join Date: Jan 2005
Location: Martinsville, IN
Posts: 2,326
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High EGT Warnings
One of my EGT signals gives me a warning every time I fly. Why should I care? All the other engine numbers are fine, and all the plugs are a nice Gray color. It runs great and I'm not inclined to worry about it. Should I?
I suspect a probe issue is causing it but even if the probe checks out fine, why would this be an issue?
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Randy Pflanzer
Greenwood, IN
www.pflanzer-aviation.com
Paid through 2043!
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05-21-2016, 06:32 AM
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Super Moderator
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Join Date: May 2005
Location: Locust Grove, GA
Posts: 2,626
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AT what temp do you have the high alarm configured?
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 Vic Syracuse
Built RV-4, RV-6, 2-RV-10's, RV-7A, RV-8, Prescott Pusher, Kitfox Model II, Kitfox Speedster, Kitfox 7 Super Sport, Just Superstol, DAR, A&P/IA, EAA Tech Counselor/Flight Advisor, CFII-ASMEL/ASES
Kitplanes "Unairworthy" monthly feature
EAA Sport Aviation "Checkpoints" column
EAA Homebuilt Council Chair/member EAA BOD
Author "Pre-Buy Guide for Amateur-Built Aircraft"
www.Baselegaviation.com
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05-21-2016, 07:50 AM
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Join Date: Nov 2014
Location: Hinckley, Ohio
Posts: 2,065
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I just had this issue with D-180 EMS. Replaced thermocouple and problem is fixed.
Dynon EGT, Hose Clamp, 0.75-1.25", Rotax
SKU: #100405-001 $47.00 shipped.
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Jim Stricker
EAA #499867
PPL/ASEL 1970 - Sport Pilot since 2007
80 hrs Flying Aeronca Chief 11AC N86203
1130 hrs Flying 46 Piper J-3 Cub N6841H
Bought Flying RV-12 #120058 Oct 2015 with 48TT - Hobbs now 622 
LSRM-A Certificate 2016 for RV-12 N633CM
Special Thanks... EJ Trucks - USN Crew Chief A-4 Skyhawk
MJ Stricker (Father & CFI) - USAAF 1st Lt. Captain B-17H
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05-21-2016, 08:43 AM
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Join Date: Apr 2008
Location: Riley TWP MI
Posts: 3,070
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Mike Bush wrote that "There is no limit for EGT."
The Savvy Aviator #59: EGT, CHT and Leaning
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Joe Gores
RV-12 Flying
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05-21-2016, 09:16 AM
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Join Date: Apr 2008
Location: Davenport, IA
Posts: 1,390
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If the EGT temperature is spiking is most likely a bad connection at the spade lugs or the DB pins.
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05-21-2016, 12:55 PM
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Join Date: Oct 2012
Posts: 421
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Quote:
Originally Posted by f1rocket
One of my EGT signals gives me a warning every time I fly. Why should I care? All the other engine numbers are fine, and all the plugs are a nice Gray color. It runs great and I'm not inclined to worry about it. Should I?
I suspect a probe issue is causing it but even if the probe checks out fine, why would this be an issue?
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I had the right one go...ordered a couple of extra...replaced the right...working fine....guess what?
...the left one is acting funky.
I think there might be a bad batch out there imho.
Yeah..... you can fool with recrimping/new connectors - that might be it.... 
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05-21-2016, 01:28 PM
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Join Date: Mar 2010
Location: Raleigh, NC
Posts: 863
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Could you mention how many hours you got on your probes?
My right EGT probe acted funny after my annual with wild fluctuations ending with the red cross (no, not this one, the one on the Skyview  ). That was at 140 hour. It bothered me a while and I ordered a new unit but before installing it, I noticed that the wire going to the probe was very tight so I gave it some slack: problem solved. Twenty hours later it still works fine... and I have got a spare!
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05-21-2016, 01:45 PM
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Join Date: Nov 2014
Location: Hinckley, Ohio
Posts: 2,065
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Quote:
Originally Posted by WingedFrog
Could you mention how many hours you got on your probes?
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As per post #3 above... I replaced my right EGT. It started acting up ~ 80 hours. It sort of healed itself for the next 15 hours and just two weeks ago it decided to give me grief. I tried re-crimping the connectors and fooled myself into thinking I had it fixed. New thermocouple purchased directly from Dynon fixed the problem and easy install with removing top cowl only.
__________________
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Jim Stricker
EAA #499867
PPL/ASEL 1970 - Sport Pilot since 2007
80 hrs Flying Aeronca Chief 11AC N86203
1130 hrs Flying 46 Piper J-3 Cub N6841H
Bought Flying RV-12 #120058 Oct 2015 with 48TT - Hobbs now 622 
LSRM-A Certificate 2016 for RV-12 N633CM
Special Thanks... EJ Trucks - USN Crew Chief A-4 Skyhawk
MJ Stricker (Father & CFI) - USAAF 1st Lt. Captain B-17H
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05-21-2016, 07:12 PM
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Super Moderator
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Join Date: May 2005
Location: Locust Grove, GA
Posts: 2,626
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Quote:
Originally Posted by Mich48041
Mike Bush wrote that "There is no limit for EGT."
The Savvy Aviator #59: EGT, CHT and Leaning
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I agree. That's why I asked where you had your limits set at. I see a number of airplanes that have EGT limits set around 1400 degrees.
Vic
__________________
 Vic Syracuse
Built RV-4, RV-6, 2-RV-10's, RV-7A, RV-8, Prescott Pusher, Kitfox Model II, Kitfox Speedster, Kitfox 7 Super Sport, Just Superstol, DAR, A&P/IA, EAA Tech Counselor/Flight Advisor, CFII-ASMEL/ASES
Kitplanes "Unairworthy" monthly feature
EAA Sport Aviation "Checkpoints" column
EAA Homebuilt Council Chair/member EAA BOD
Author "Pre-Buy Guide for Amateur-Built Aircraft"
www.Baselegaviation.com
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05-21-2016, 08:05 PM
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Join Date: Mar 2014
Location: Prescott, AZ
Posts: 739
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You can always swap it with another probe (like 1&3 or 2&4) and see if the reading follows the probe or cylinder. Don't need to swap the connections. The probes do fail, mostly open up or wiring failure. If you've installed all the probes the same distance down the pipes from the flanges the EGT's should all be pretty close if the mixtures are closely equal in all the cylinders.
Last edited by FasGlas : 05-21-2016 at 08:09 PM.
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