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CHT Disparity-Jabiru 3300

 
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Tim Juhl



Joined: 21 Mar 2006
Posts: 488
Location: "Thumb" of Michigan

PostPosted: Tue Aug 13, 2013 10:12 am    Post subject: CHT Disparity-Jabiru 3300 Reply with quote

I attended a forum at Oshkosh where a fellow discussed his research on cooling a Jabiru 3300. He had compared the spark plug washer type CHT sensors to ones directly in the head and showed that they pretty consistently indicated CHT's about 70° cooler than actual temperatures! If this is the case, Jab operators could be cooking their engines while thinking that their CHT's were within safe limits. He ended up designing a cooling baffling system that is nothing like what comes from the factory and claimed that was the only way he was able to get the CHT's under control.

I wonder what the rest of you Jabiru 3300 operators have to say about this? I'm not flying mine yet but will be getting ready to hang it soon.

For a summary on the fellow who made the presentation check out http://www.eaaapps.org/presenterinfo.aspx?id=1973

Tim


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______________
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Champ L16A flying
Zodiac XL - Jabiru 3300A
Almost done! It'll fly in spring!
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PostPosted: Tue Aug 13, 2013 10:25 am    Post subject: CHT Disparity-Jabiru 3300 Reply with quote

Hi Tim,

I believe the Jabiru specifications are based on the spark plug sensors.

My 3300 is running just fine after about 50 hours. It wanted to
overheat at first but I reduced throttle to keep from getting it too
hot. Probably my first 10 or 15 flight hours were dedicated to making
small changes in the cooling air flow and test flying. I have Dynon EMS
with sensors on each cylinder and exhaust to monitor the temps.

One anecdotal experience I had was a big mouth engineer on one of the
Jabiru lists who claimed all Jabirus had evidence of overheating on the
cylinder bottoms. I sent him photographs of mine, and after avoiding
response he admitted my engine looked just fine with no suggestion it
had ever been overheated.

When you let the cylinders get hot (not necessarily overheated, but
warmer than is good) the cylinder head bolts tend to get a bit loose.
You should check them regularly after first running your engine.

Good luck,

Paul
Camas, WA

On 8/13/2013 11:12 AM, Tim Juhl wrote:
Quote:


I attended a forum at Oshkosh where a fellow discussed his research on cooling a Jabiru 3300. He had compared the spark plug washer type CHT sensors to ones directly in the head and showed that they pretty consistently indicated CHT's about 70° cooler than actual temperatures! If this is the case, Jab operators could be cooking their engines while thinking that their CHT's were within safe limits. He ended up designing a cooling baffling system that is nothing like what comes from the factory and claimed that was the only way he was able to get the CHT's under control.

I wonder what the rest of you Jabiru 3300 operators have to say about this? I'm not flying mine yet but will be getting ready to hang it soon.

For a summary on the fellow who made the presentation check out http://www.eaaapps.org/presenterinfo.aspx?id=1973

Tim

--------
______________
CFII
Champ L16A flying
Zodiac XL - Jabiru 3300A
Wing modifications done - back working on the fuselage


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