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Question on EGT on Jab3300

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amyvega2005(at)earthlink.
Guest

Posted: Sun Jun 15, 2008 5:19 pm Post subject: Question on EGT on Jab3300

Question to the Engine geniuses on this site.  My CHTs are all reading great, between 267 and 280 on all 6 cylinders on my Jabiru.



Number 5, the right rear most side has an EGT of 1400 and all other EGTs are reading 1300 to 1320. so they read as follows

EGT 1310

    1320

    1315

    1315

    1400

    1320



Why are the CHTs running great but the 5th cylinder EGTs running hoter by 100 degrees than rest?



Anythoughts?



Juan Vega Jabiru 3300

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psm(at)att.net
Guest

Posted: Sun Jun 15, 2008 6:16 pm Post subject: Question on EGT on Jab3300

Hi Juan,



It may be that your #5 jug is running hotter or it may be the sensor 

is measuring it differently from the other ones.  Is there a way you 

can swap sensors between 3 and 5 and see if the hot jug moves?  If it 

does, you know it is a measurement issue rather than something about 

the engine itself.



Fortunately, I think the difference you are seeing is not a 

problem.  It may just wind up being one of those curious things that 

you never figure out.



Have fun,



Paul

XL getting close to done



 	  Quote: 	
		  Number 5, the right rear most side has an EGT of 1400 and all other 

EGTs are reading 1300 to 1320. so they read as follows

EGT 1310

     1320

     1315

     1315

     1400

     1320



Why are the CHTs running great but the 5th cylinder EGTs running 

hoter by 100 degrees than rest?



Anythoughts?



Juan Vega Jabiru 3300

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jetboy

Joined: 22 Jul 2006
Posts: 233

Posted: Sun Jun 15, 2008 6:19 pm Post subject: Re: Question on EGT on Jab3300

Juan,

       aside from probe placement being effectively different from the point of view of the gasflows,  if you have a cylinder thats leaner than others and is near its peak EGT or running on the lean side of peak, the CHT on that cyl. will be less than for another cyl. running on the rich side of peak EGT.



With the bing carb there is not much you can do other than rotate the carb to balance the mixtures (bottom of carb rotates towards the leaner cyl bank by 5 to 10 degs) or lag the #5 pipe with insulation if they are in a cold airstream. Also check there is no intake leaks or cyl. head to barrel leak.



Ralph

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_________________
Ralph - CH701 / 2200a

amyvega2005(at)earthlink.
Guest

Posted: Mon Jun 16, 2008 3:37 am Post subject: Question on EGT on Jab3300

thanks, i think you are on to something. I am switching the sensors to check it out.  also doing a pressure differential test just in case.

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amyvega2005(at)earthlink.
Guest

Posted: Mon Jun 16, 2008 3:37 am Post subject: Question on EGT on Jab3300

thanks, i am going to do a pressure differential test to check for leaks.



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