Today's Message Index:
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1. 05:24 AM - Re: 3300A Induction System (Lynn Matteson)
2. 06:52 AM - Re: 3300A Induction System (wypaul)
3. 07:13 AM - EGT's (BobbyPaulk@COMCAST.NET)
4. 07:28 AM - Re: EGT's (sonex293)
Message 1
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| Subject: | Re: 3300A Induction System |
Yes, there are o-rings where the tubes plug into the plenum, and my
engine, when new, had a bit of sealant around the tubes at that point
also. When I rebuilt my engine, I smeared a bit of RTV around the
tubes where they enter the plenum, just to be sure of no leaks.
Lynn Matteson
Kitfox IV Speedster, taildragger
Jabiru 2200, #2062, 681.2 hrs
Sensenich 62x46 Wood prop
Electroair direct-fire ignition system
Status: flying
On Jun 22, 2009, at 10:21 PM, sonex293 wrote:
> <sonex293@gmail.com>
>
> Well, after 28 hours I'm still battling high EGT's on Cylinders 3 &
> 5. during WOT. I've tried rotating the carburetor to try and
> compensate for the higher EGT temps on #3 and #5. On take-off I'm
> seeing 1450F+. As soon as I pull power back the temps drop to
> manageable levels although #3 & #5 are always the highest.
>
> I've decided the next time I'm out at the airport I want to check/
> inspect the induction path on cylinders #3 & #5 for leaks. The
> Operator's manual and parts manual don't describe the process of
> removing the induction tubes from the induction plenum. So I have
> somewhere to start, has anyone removed the lower induction tubes
> and are there any "gotchas" I need to worry about? The parts
> manual mentions an O-Ring at this interface? I don't want to
> damage anything. Anyone have any pictures they'd care to share?
>
> Thanks,
> Michael
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=249616#249616
>
>
Message 2
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| Subject: | Re: 3300A Induction System |
Michael,
If you have the old style of exhaust with the gaskets at the head these will be
likely suspects. An easy way to check for manifold leaks is to spray carb cleaner
at all connects and joints while the engine is running. If you have a leak
there will be a drop in RPM and the engine will run rough. I had the old
style exhaust and mine would blow gaskets within a couple of hours of being replaced.
I finally had the heads machined to take the new exhaust.
Paul Spackman
Q2 Jabiru 3300 #278
--------
Paul Spackman
Q-2 Jabiru 3300
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=249653#249653
Message 3
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Michael
i have the Jab 3300 on a 601 XL that was running high EGT's on climb out at WOT.
i finally had to go to a 260 main jet to get them down to manageable temps.
they are now all in the 1200 to 1250 range.
i also had to richen up the needle jet one size to lower cruise EGT's
you might want to try this. it also brought down my CHT's.
Fuel consumption is 5.2 GPH at 2800 RPM
do not archive
Bobby
N131BP
Message 4
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Bobby,
I should have mentioned that I'm running a Jabiru 3300A w/ Hyd Lifters which has
the new exhaust and induction designs, as well as the new head fin design.
I'm also running an AeroCarb instead of the Bing.
Last week I put some monitored engine data on my website, which you can see here...
I haven't gotten the courage yet to get near the spinning prop, as I've gotten
that suggestion from some local automotive gearheads.
Thanks for comments!
--
Michael Crowder
Jabiru 3300A w/ Hyd Lifters
AeroCarb w/ #3 needle
Sonex N293SX
BobbyPaulk(at)COMCAST.NET wrote:
> I have the Jab 3300 on a 601 XL that was running high EGT's on climb out at WOT.
>
> I finally had to go to a 260 main jet to get them down to manageable temps.
They are now all in the 1200 to 1250 range.
>
> I also had to richen up the needle jet one size to lower cruise EGT's
> you might want to try this. it also brought down my CHT's.
>
> Fuel consumption is 5.2 GPH at 2800 RPM
>
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=249674#249674
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