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EGT sensor installation location

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ruruny(at)aol.com
Guest

Posted: Sat Jul 21, 2007 7:49 pm Post subject: EGT sensor installation location

Looking at the 2 attached pics of the left and right side of my engine, what would be the best place to install the EGT sensors.

 Just thought I'd get some input from anyone who might know if there is a best way to do it. There are 4 of them for my GRT EIS.

 

 Thanks

 Brian

 701Builder.com

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planecrazydld(at)yahoo.co
Guest

Posted: Sun Jul 22, 2007 4:02 am Post subject: EGT sensor installation location

I cannot recommend a position for them but the following is good instrumentation theory that will yield comparable values from the four sensors:

Place each probe into the stream at a point equidistant from its exhaust valve
Place the probe so that the tip is as close to the center of the flow field as possible. Note that the probe may shift when tightened and take that into account
Safety the clamp and strain relief the probe leads
If extension wire is needed, make sure that it is the came calibration as the probe (for example type J probe = type J extension wire)

I would think that Rotax would be able to specify the optimal distance from the exhaust valve.



ruruny(at)aol.com wrote: 	  Quote: 	
		    Looking at the 2 attached pics of the left and right side of my engine, what would be the best place to install  the EGT sensors.

 Just thought I'd get some input from anyone who might know if there is a best way to do it. There are 4 of them for my GRT EIS.

 

 Thanks

 Brian

 701Builder.com

   

 	


  Dave Downey

  Harleysville (SE) PA

  100 HP Corvair

        Be a better Globetrotter. [url=http://us.rd.yahoo.com/evt=48254/*http://answers.yahoo.com/dir/_ylc=X3oDMTI5MGx2aThyBF9TAzIxMTU1MDAzNTIEX3MDMzk2NTQ1MTAzBHNlYwNCQUJwaWxsYXJfTklfMzYwBHNsawNQcm9kdWN0X3F1ZXN0aW9uX3BhZ2U-?link=list&sid=396545469]Get better travel answers [/url]from someone who knows.

Yahoo! Answers - Check it out.   [quote][b]

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jeffrey_davidson(at)earth
Guest

Posted: Sun Jul 22, 2007 4:32 am Post subject: EGT sensor installation location

Brian,  

            I can't tell you about the Rotax, but on the Jabiru 3300 Jabiru had a definite recommendation on how far down the exhaust pipe to place the sensors.  I'd check with a Rotax source (Lockwood?) for your answer. But I would expect much of an answer this week.  Everyone who is a vendor is at Oshkosh.  

            Jeff Davidson  

   

Do not archive  

         

  

From: owner-zenith-list-server(at)matronics.com [mailto:owner-zenith-list-server(at)matronics.com] On Behalf Of ruruny(at)aol.com

 Sent: Saturday, July 21, 2007 11:49 PM

 To: zenith-list(at)matronics.com; aeroelectric-list(at)matronics.com

 Subject: EGT sensor installation location  

  

     

Looking at the 2 attached pics of the left and right side of my engine, what would be the best place to install the EGT sensors.

 Just thought I'd get some input from anyone who might know if there is a best way to do it. There are 4 of them for my GRT EIS.

 

 Thanks

 Brian

 701Builder.com  

        

  

  

        [quote][b]

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larry(at)macsmachine.com
Guest

Posted: Sun Jul 22, 2007 6:25 am Post subject: EGT sensor installation location

Brian,

For the Subaru, EA-81, 100 hp, EGTs are located about 3-1/2 inches from 

the exhaust valve.  Yours would probably be placed in a

similar location as near where curve of the pipe ends.  There's a 

drawing out there that shows something like this by Rotax but

this is what several have done for the 912 and 914 per the archives.



Larry McFarland 601HDS at www.macsmachine.com



ruruny(at)aol.com wrote:

 	  Quote: 	
		   Looking at the 2 attached pics of the left and right side of my 

 engine, what would be the best place to install the EGT sensors.

 Just thought I'd get some input from anyone who might know if there is 

 a best way to do it. There are 4 of them for my GRT EIS.



 Thanks

 Brian

 701Builder.com

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msherman95632(at)yahoo.co
Guest

Posted: Sun Jul 22, 2007 10:13 am Post subject: EGT sensor installation location

Brian.

  

 The installation manual for the Rotax tells you the exact distance from the exhaust port for the EGT probes.  The reason they want you to use this position is, that is where they took the reading to come up with the maximum EGT temperature.  You could put them in a different position, but your reading could be considerably off  (low reading) and cause you to cook the engine.  Which would be hard to do with a CV carb.  I guess if you had a vacuum leak you could lean out one or two cylinders.  Your cylinder head temp gage should indicate the rise in temperature also, but it is a little slow reacting to the change because it really isn't a CHT gage. It sits on the cylinder head, but is also in a water jacket.  So it doesn't really reflect a accurate CHT or water temp.  It's a combo of both.  I am using a water temp gage in the water line  after the coolant leaves the engine and before it gets to the radiator.  Hottest point.

  

 Mark S.

 701/912ULS

  

  

  

  

  

  

  

 



 

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