Today's Message Index:
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1. 12:25 AM - Re: CHT Question? (Naftali Horowitz)
2. 06:16 PM - Re: CHT Question? (wypaul)
Message 1
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1. You need to climb at 70 KCAS in order to create the proper pressure diff
erence for cooling.
2. Cooling air should engulf the heads and the complete cylinders=2C top to
bottom=2C and around=2C not just the top (lower baffles).
3. Any gap will increase the CHT.
4. There is some relation between CHT and EGT.
5. CHT balancing by upper baffles.
Complicated? You bet!
From: jeffrey-j-paris@excite.com
Subject: JabiruEngine-List: CHT Question?
Jabiru Listers=2C
Is there (inverse or converse) relationship between if a CHT is low the EGT
would be Highor vice versa a High CHT might result in a low EGT. In summa
ry=2C I've been battling some highCHT's in my Bing Carbureated Jabiru 3300
and I'm getting very low on possible answers to solving my problems=3B ever
since I retrofitted the economy tuning kit in my carby last March. Many o
f you have offered numerous solutions=2C which I have done and the results
are a bit better but still not there. My #2 and #4 cylinders still rise l
ike banshees on climb and in cruise I hover around 295- 300 degrees on #2 a
nd 315-320 degree on #4.
Anyways=2C things just suck right now also due tothe fact that I built and
fly a Zenith 601XL and it looks like we are all grounded.
Disheartened in NY=2C
Jeff Paris CH601XL Jabiru 3300 282 total hours of flying fun/ In addition
=2C building a Europa Classic Monowheel w/ a Jab 3300.
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Message 2
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| Subject: | Re: CHT Question? |
Jeff,
Step back, take a deep breath and look on the bright side of the 601 saga. There
seem to be some weakness in the design that will be resolved in short order
and you are alive and able to continue to address the issues with your "Experimental"
aircraft. I know that does not help with the cooling issues that you
are experimenting with but how about a long post of what you have tried, engine
#, prop, jetting before the upgrade, was it cooling ok then...better worse
etc. It would be helpful to see some pictures also. I am guessing that you have
called Jabiru USA or Jabiru Pacific and talked to them directly about your
cooling issues. How are your oil temp?
--------
Paul Spackman
Q-2 Jabiru 3300
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http://forums.matronics.com/viewtopic.php?p=272194#272194
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