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Installing EGT probes on Jab 3300

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AZFlyer

Joined: 11 Jan 2006
Posts: 89
Location: Prescott, AZ

Posted: Fri Jul 30, 2010 1:37 pm Post subject: Installing EGT probes on Jab 3300

Page 24 of the Installation Manual for the Jab 3300, last sentence says "Exhaust Gas Temps. - Nominal 1202 F - 1382 F, measured 100mm from the exhaust manifold flange."  



Is that 100mm measured   1. "on the side of the pipe"  2.  "on the outside curve of the pipe"  3.  "on the inside curve of the pipe"  ?  ...or does it matter?  



Or should I just be consistent from pipe to pipe?



Thanks,

Mike

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_________________
Mike Miller @ millrml@aol.com
601 XL-B, 3300, Dynon

Remember, "the second mouse gets the cheese"!

lwhitlow

Joined: 15 Jan 2006
Posts: 76
Location: Valparaiso Indiana

Posted: Fri Jul 30, 2010 3:54 pm Post subject: Re: Installing EGT probes on Jab 3300

I went for the same location on each pipe  I tried to measure 100 mm on the side of the curve and then drew a band at that location.  I then put the EGT probes to the inside of the curve as best I could.



Larry

 601XL B   Will fly sometime in my lifetime.

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jeffrey_davidson(at)earth
Guest

Posted: Fri Jul 30, 2010 5:49 pm Post subject: Installing EGT probes on Jab 3300

Mike,

	I have asked this question too and didn't get a straight answer.

For my installation, I measured from the flange to where the bayonet entered

the exhaust pipe.  It makes sense to me that being consistent from pipe to

pipe is required.  I'm seeing EGTs in the range 1350 to 1400 pretty much as

USJabiru indicates in their installation video.  I have 11 hours on my

engine.  I am current trying to get the CHTs down with interior baffles in

the air plenums.



Jeff Davidson

CH601-HD 3300A (Solid Lifters)

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craig(at)craigandjean.com
Guest

Posted: Fri Jul 30, 2010 6:47 pm Post subject: Installing EGT probes on Jab 3300

Arthur Krueger [bldrflyr(at)att.net] posted this on the Yahoo Jabiru engine

list on July 21st:



"I once made a couple of test flights with two EGT probes installed

simultaneously on the #2 cylinder exhaust pipe of my 3300 engine. One probe

was located 3" (about 75mm) from the head and the other was located 4"

(about 100mm) from the head. After correcting for individual probe error, I

found that the probe located closer to the head gave readings about 6

degrees F. (about 3 degrees C.) higher than the probe further away. Not

exactly what you are looking for but maybe it'll help.



Art................Sonex N6UZ taildragger (#0095)..................Jab3300

(#261)/AeroCarb"



-- Craig 



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