Today's Message Index:
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1. 11:11 AM - Re: Single Liftstrut for FireFly... message for undoctor (Don G)
2. 02:49 PM - Thom, Chris or Jabiru owners (tkben002)
3. 05:26 PM - Re: Thom, Chris or Jabiru owners (ces308)
4. 05:32 PM - Re: Thom, Chris or Jabiru owners (ces308)
5. 05:39 PM - Re: Thom, Chris or Jabiru owners (tkben002)
6. 05:51 PM - Re: Thom, Chris or Jabiru owners (ces308)
7. 06:38 PM - Re: Thom, Chris or Jabiru owners (tkben002)
8. 06:49 PM - Re: Thom, Chris or Jabiru owners (ces308)
Message 1
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Subject: | Re: Single Liftstrut for FireFly... message for undoctor |
HOLY COW HENRY!,,, that photo is one of the most fabulous I have ever seen...what
a shot!
And yes..the streamline tubing is alum from wicks, Cant remember what size..same
as used on a CGS hawk tho, I remember that being a deciding factor for sizing
it...(ask Kulpski to measure it)..and the steel is 4130 chrome-moly.
--------
Don G.
Central Illinois
Kitfox IV Speedster
Luscombe 8A
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Subject: | Thom, Chris or Jabiru owners |
I am at a point where I do not know what to do next. I have a Kolbra with a solid
lifter Jabiru 2200 with 50 hrs on the engine and 25 on the plane.
I have been battling a high cht temp on cylinders 3 and 4. I only have 2 cht probes
and they are currently on #3 and 4 which are my hottest (#4) and coldest
(#3). The coldest will hit around 260F in climb and cool off to about 200f in
cruise. The hottest will hit 345 to 350f in climb then I generally lower the
nose and cool it off alittle and at cruise will range from 315 to 330f. I can
adjust these temps somewhat by tilting the carb back and forth and when the
carb is close to center but not quite I can get even cht's on both cylinders
in idle and up to about 1300 rpm while taxiing.
Now, the harder part. My egt's have been about 100f apart and pretty consistent
around 1100 on cylinders 2 and 4 and 1200 on cylinders 1 and 3. Last weekend
a friend at the airport (with a sonex and 3300) noticed that I did not have
a tube from the carb to the air filter and recommended that I put one in so, I
did. Yesterday when I flew all was as usual except when I reached 100ft altitute
my red light on the eis was going off and I was not expecting that. The
EGT on cylinders 1 and 3 was up to 1450-1460 in full power climb and the egt on
cylinders 2 and 4 what around 1380. As I began to throttle back and egts reduced
when at pattern altitude and around 2700 rpm. The egt on cylinders 1 and
3 took longer and a little lower rpm to cool off back in the 1368 or less range.
Next I commense to tilting the carb to adjust the fuel/air mixture to cylinders
1 and 3 to get the egts down and nothing I do makes any difference. It was recommended
to reject the carb and I was handed a 283 jet and replaced the 276
that was in the carb. The main jet is a 255. I flew some more and the egts on
cylinders 2 and 4 reduced to around 1225 to 1250 but the egts on cylinders 1
and 3 was still at 1450 in full power climb. I suspected a fuel flow issue so
I tried the electric fuel pump and it made no difference either.
I did not want to do any damage so I took off the air vent hose on the carb and
went around the pattern and all was back to usual except when I reduced throttle
in the pattern the engine started sputtering and I thought it was going to
quit but It didnt. Needless to say but I think it was too rich so I jetted the
carb back to the 276 that came with it and it went back to usual. Now I am
back to square one. I know the mixture is rich and I am burning more than 4
gallons per hour and do not know what to do next.
Thom and Chris, I know each of you have the jabiru 2200 on yours, any recommendations?
I was told that since my BRS sits right in front of my carb that it could
be causing some problems and that I should run a remote air filter with scat
hose.
Thanks,
Travis Bennett
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Subject: | Re: Thom, Chris or Jabiru owners |
Hello Travis,
First of all....I have no idea what jet I have in my carb...and I only have
cht and egt for 2 cylinders which to start with were on cyls 3 & 4 ( the ones
toward the leading edge of the wing)..before I changed the cht to 1&2, cht's on
3 & 4 would run 260 - 280* ..but since I over headed my #2 cyl in a ground test
run last winter I moved the cht's to 1 & 2 so I know what the back cylinders
are doing...when you look at the picture I submitted, remember that the egt's
are for the front cylinders and I suspect #4 is lower because the compression
was lower in that cylinder and this winter I may clean up and re-ring that
cylinder...how ever , since it doesn't burn a drop of oil now after redoing the
#2 cylinder and at that rpm it seems to burn 3 gph,I may not do anything with
it. I wish I had probs on all the cylinders...
Tilting the carb WILL make a difference...after I got her together this summer
I had the carb on straight and level and on climb at WOT my egt's went to 1390
and when throttled back went back down....after tilting the carb a couple of
times I never had a problem.
my cht 's even on 95* days stay at 320* and coming home the other evening the OAT
was around 65-70 *.
I'm not sure what to tell you,but hope this gives you something to shoot for...according
to Jim at Jabiru Pacific I'm right in the ball park .
chris ambrose
M3X/Jabiru A-2200 225. hrs
N327CS
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Subject: | Re: Thom, Chris or Jabiru owners |
Travis,
What rpm are you running at 4 gph?? And I was told you have to have that tube
going into the carb to make it work right...
chris ambrose
M3X/jab a 2200
N327cs
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Subject: | Re: Thom, Chris or Jabiru owners |
I am not sure what gph I am running but as I have not done the math because I have
not kept good enough records for it, but I am sure it is over 4 gph right
now. Now when I ran for 1.2 hours yesterday with the tube hooked to the carb
and airfilter the engine ran better and seemed to have more power but I was really
focused in on the high egt. I only have 2 egt and 2 cht probes and wish
I had all 4. I moved mine from #1 and 2 in the back to the front 2 and that is
where they are now as they were the fartherest apart.
thanks,
Travis Bennett
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Subject: | Re: Thom, Chris or Jabiru owners |
Travis...
I am confused.....your hottest cylinders are the ones at the front openings of
the air scoops?? ( 3 & 4 ) ??
chris ambrose
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Subject: | Re: Thom, Chris or Jabiru owners |
Actually, my hottest cylinders are #2 and 4 with #4 being the hottest. My coldest
is #3. It seems weird that my hottest cylinder is the one in front (fartherest
away from the prop).
Travis Bennett
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Subject: | Re: Thom, Chris or Jabiru owners |
Travis...
That is strange......I don't get it.....lets see what Thom thinks...Hmmmm...
chris ambrose
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