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EGT on vetterman exhaust

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sarg314(at)comcast.net
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Posted: Sun Dec 17, 2006 3:02 pm Post subject: EGT on vetterman exhaust

The VisionMicro EGT probes are supposed to be 3.5 - 4" from the exhaust 

flange.  The vetterman exhaust (for the O-360, anyway) on Cyl #1 and Cyl 

#3 has the welded pin that locks the 2 pipe segments together positioned 

right where you'd want to put the EGT probe.  I can position the probe 

too high (3" or less from the flange) or too low about 4.2" from 

flange.  The lower position has the clamp slip in just under the pin 

bracket.  The clamp is held captive by the bracket, but it straddles the 

junction where the 2 pipes fit together.



Is there any argument for choosing the too hi or the too low position?  

I assume the higher location will read a little hotter.  It may not 

matter.  What have other vetterman users done?



Thansk,

--

Tom Sargent, RV-6A.

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n616tb(at)btsapps.com
Guest

Posted: Sun Dec 17, 2006 8:04 pm Post subject: EGT on vetterman exhaust

Mine are under in the lower position and it works just fine.



Tim



[quote] --

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sarg314(at)comcast.net
Guest

Posted: Fri Dec 22, 2006 2:08 pm Post subject: EGT on vetterman exhaust

I finally talked with Larry Vetterman about EGT probes. I think Larry's 

the best expert we have on RV exhausts.  He continues to do careful 

experimentation with exhausts and speaks from experience.



Larry's advice is to place the EGT probes no more than 2.5" down from 

the flange of the exhaust port of the cylinder.  1.5" to 2.0" is OK.  He 

has experimented with different positions.  You will get more consistent 

temperature readings this way, says Larry.  Yes, the EGT probe won't 

last as long as one mounted further down.  It still lasts pretty long, 

though.  Larry's RV-4 has 1000hrs on its probes and they're still OK.  

This fits with Dale Walter's note that his are 2" down and have 736 hrs 

on them and work well.  So, that is what I am going to do.



    Note that the 2.5" is measured from the face of the cylinder, so it 

includes the thickness of the gasket and the flange welded onto the end 

of the pipe.  It's really up there close to the cylinder.

--

Tom Sargent, RV-6A

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