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04-17-2007, 12:20 AM
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Join Date: Jan 2005
Location: South Africa, Johannesburg
Posts: 1,313
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Where to Drill EGT probe holes
Hi Guys,
A quick question: I have bought a dynon headstart package with all the engine probes, but did not receive documentation to consult, hence my question.
I need to drill my EGT probes in the XP-IO-360 exhaust, but what is the correct measurement. I searched and see some people put them at 1" other at 2".
What is the correct EGT probe location measurement and from where?
PS: I know from my 2 stroke Rotax days the exact position is very important to get accurate readings to compare to engine company operating recommendations. Wrong location = Wrong comparable Readings
Thank you in advance.
Kind Regards
Rudi
__________________
Rudi Greyling, South Africa, RV 'ZULU 7' Flying & RV 'ZULU 10' Flying
"Science, freedom, beauty, adventure...what more could you ask of life? Aviation offers it all" - Charles A. Lindbergh
Last edited by RudiGreyling : 04-17-2007 at 12:23 AM.
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04-17-2007, 02:38 AM
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Join Date: Jan 2005
Location: 57AZ - NW Tucson area
Posts: 10,011
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Manual here....
Rudi... you need to download the installation manual.....
http://www.dynonavionics.com/downloa...text_-_web.pdf
Page 14 has the EGT probe mounting location.... 2 inches to 8 inches from the cylinder on straight portion of the pipe.
See if you can plan your lead routing first, then you can orient the hole on the pipe to "point" the leads in the best direction....
gil in Tucson
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Gil Alexander
EAA Technical Counselor, Airframe Mechanic
Half completed RV-10 QB purchased
RV-6A N61GX - finally flying
Grumman Tiger N12GA - flying
La Cholla Airpark (57AZ) Tucson AZ
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04-17-2007, 06:05 AM
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VAF Moderator / Line Boy
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Join Date: Jan 2005
Location: Dayton, NV
Posts: 12,247
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Hi Rudi,
Gil pointed you to the right place. The only thing I'll add is that it's important to try and put all the probes the same distance from the exhaust flange (for each cylinder) if you want to try and match your EGT's. Absolute EGT rarely means much for us piston guys - you will be comparing them, and for that, you want to be consistent.
Paul
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Paul F. Dye
Editor at Large - KITPLANES Magazine
RV-8 - N188PD - "Valkyrie"
RV-6 (By Marriage) - N164MS - "Mikey"
RV-3B - N13PL - "Tsamsiyu"
A&P, EAA Tech Counselor/Flight Advisor
Dayton Valley Airpark (A34)
http://Ironflight.com
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04-17-2007, 06:30 AM
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Join Date: Mar 2005
Location: Dallas area
Posts: 10,762
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Like Paul pointed out, the important thing is that all probes are the same distance form the exhaust flange. If the probes are closer, they will have a faster response, if they are farther, they will last longer. If you go more than about 4", they will respond rather slowly.
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Mel Asberry, DAR since the last century.
EAA Flight Advisor/Tech Counselor, Friend of the RV-1
Recipient of Tony Bingelis Award and Wright Brothers Master Pilot Award
USAF Vet, High School E-LSA Project Mentor.
RV-6 Flying since 1993 (sold)
<rvmel(at)icloud.com>
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04-17-2007, 09:32 AM
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Join Date: Jan 2007
Location: Battleground
Posts: 4,348
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Watch your plugs!
Make sure you orient them where they dont interefere with your spark plug wrench. Sounds simple, but I have seen it done. Having to pull your probe to change a plug is no good.
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Smart People do Stupid things all the time. I know, I've seen me do'em.
RV6 - Builder/Flying
Bucker Jungmann
Fiat G.46 -(restoration in progress, if I have enough life left in me)
RV1 - Proud Pilot.
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04-17-2007, 10:08 AM
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Join Date: Mar 2005
Location: Dallas area
Posts: 10,762
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Very good point, Jon. I have run into this problem on several inspections.
__________________
Mel Asberry, DAR since the last century.
EAA Flight Advisor/Tech Counselor, Friend of the RV-1
Recipient of Tony Bingelis Award and Wright Brothers Master Pilot Award
USAF Vet, High School E-LSA Project Mentor.
RV-6 Flying since 1993 (sold)
<rvmel(at)icloud.com>
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04-18-2007, 10:57 PM
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Join Date: Jan 2005
Location: South Africa, Johannesburg
Posts: 1,313
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Hi Guys,
Thank you for all the good information.
Regards
Rudi
__________________
Rudi Greyling, South Africa, RV 'ZULU 7' Flying & RV 'ZULU 10' Flying
"Science, freedom, beauty, adventure...what more could you ask of life? Aviation offers it all" - Charles A. Lindbergh
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