Lynn Matteson
Joined: 10 Jan 2006
Posts: 2778
Location: Grass Lake, Michigan
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 Posted: Fri Apr 18, 2008 11:10 am Post subject: Fwd: [jabiruengines] Re: EGTs and fuel quality |
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Begin forwarded message:
| Quote: | From: Lynn Matteson <lynnmatt(at)jps.net>
Date: April 18, 2008 2:37:32 PM GMT-04:00
To: jabiruengines(at)yahoogroups.com
Subject: Re: [jabiruengines] Re: EGTs and fuel quality
Chuck-
You may not have another groove to move the clip to...mine only had
one groove, but I'm serial #2062, with 40mm Bing.
I've got the Bing Aircraft Manual (if I could put my hands on my
copy, I'd quote it) and in it they state that you should not tune
the engine by changing the float level. It should remain the same,
and engine performance should be changed by changing the
appropriate needle, jet, or needle notch setting if the carb has
the ability to change. From what you said about changing the float
setting for full throttle, you really should change to a larger
main jet, not the float setting. This statement is also backed up
by personnel at Bing via phone call. I know that guys here have
changed the float level and gotten away with it, but they might
have had something else wrong to begin with, and the float change
corrected that, or they might have been too up/down to begin
with...hard to say. I'm still learning, but I'd rather do what the
Bing folks say, via manual or spoken word...they should know.
As far as the 4" of straight is concerned, I'm not sure where I
read/heard that, so maybe I spoke out of turn. Suffice it to say it
should be as long as possible to really insure of straight flow.
Here are pictures of the tube I just got done modifying, by adding
vanes throughout its whole length of about 6", measured right down
the center. I cut my tube lengthwise and made fiberglas vanes
inside...quite an ordeal, but it didn't HURT the performance, but
time and a less windy day than today will tell if it did any good.
Whether or not it was what did it, but I can now open the throttle
as fast as my hand will open it, and it responds NOW. Of course,
the weather has improved since the last time I tried it, so the
variables might have something to do with it. I also climb at a
better rpm...now it's 2840 or so, and before it was 2750 or so, but
that was during cold weather, so I can't really compare apples to
apples here.
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| Quote: |
Lynn Matteson
Grass Lake, Michigan
Kitfox IV Speedster w/Jabiru 2200
flying w/490+ hrs
On Apr 18, 2008, at 12:01 PM, cffd66 wrote:
> Ralph,
>
> I recently fitted EGT's to my 2200 (#988). After the vanes on my web
> site, I then tried a rubber radiator hose but then the EGT's showed
> uneven temps and rough at full throttle. I then made another vaned
> coupler 4.5 inches long (two vanes: one horizontal, one vertical)
> with
> the vanes 4 inches long. After an S curve, the scat hose comes
> straight down to the coupler. The EGT's are all very close (50
> deg) at
> all power settings. I am still getting data and may have to richen at
> full throttle (raise float) and then lean for cruise by lowering the
> needle. I do not have any of the new or old Jabiru tuning kits.
> Somewhere Lynn had told me the scat should be vertical with 4 inches
> straight and smooth into the carby.
>
> Chuck D.
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_________________
Lynn
Kitfox IV-Jabiru 2200
N369LM |
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