Today's Message Index:
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1. 06:19 PM - Question on EGT on Jab3300 (Juan Vega)
2. 07:16 PM - Re: Question on EGT on Jab3300 (Paul Mulwitz)
3. 07:22 PM - Re: Question on EGT on Jab3300 (jetboy)
4. 08:03 PM - Re: [Probable Spam] Question on EGT on Jab3300 (LarryMcFarland)
Message 1
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| 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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| Subject: | Re: 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
>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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| 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
--------
Ralph - CH701 / 2200a
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=188035#188035
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| Subject: | Re: Question on EGT on Jab3300 |
Juan,
Not being an engine guy, I'd first exchange the sensor with another
cylinder and try that.
Then, consider why the mixture might be leaner on that particular cylinder.
i.e., consider how more air or less fuel might be feeding into that
particular cylinder.
and lastly, perhaps how that cylinder's exhaust manifold may be
different from the others as proximate
to internal exhaust flow, valve gap and firing order, etc.
This is not likely caused by external temps, airflow, or cooling, but
should be found as an internal
issue driven by the internal mechanicals.
Larry McFarland 601HDS at www.macsmachine.com
Juan Vega wrote:
>
> 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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