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1. 12:55 PM - Re: SB18-1 (Lynn Matteson)
2. 12:55 PM - Re: Re: Float Level (Lynn Matteson)
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I agree on this forum, Chuck....much better than the other.
JSB018-1 says my needle is 4A138AOD-2 which it is not. Mine is
4A138AOD-1, which I assumed was a "1" groove needle, and by actual
inspection it is. I seem to recall that Jabiru used a proprietary
needle on the later carbs, and maybe they felt that one groove was
enough, and didn't want the average joe messing around with tuning
the various needle positions....I guess they were wrong. : )
Incidentally, I switched from the 276 needle jet to the 278 jet, and
it did not make a difference worth noting. I had been told it would
drop EG temps about 30 F. If it did, then weather conditions were
also different, so the change was not noticeable. I'm planning on
drilling my old 276 out to a larger number than the present 278
(still in engine) and see if the EGT change is noticeable. I'd rather
not drill it myself, relying on the "factory" drilling to be more
accurate, but I figure I'll never go back to the 276, so why not give
home drilling a go....I've got a lathe, so I can't hurt it too
much....a whole lot better than holding it with pliers and having a
neighbor wobble a drill in there. : )
This I would NOT advise!
Lynn Matteson
Grass Lake, Michigan
Kitfox IV Speedster w/Jabiru 2200
flying w/490+ hrs
On Apr 28, 2008, at 10:24 AM, Chuck Deiterich wrote:
> Lynn,
>
> SB18-1 also says for my serial number (988) the needle jet is 276
> (which it is) and the Bing needle is in the second position from
> the bottom.
>
> Chuck
> PS I like this forum better than yahoo.
> forums.matronics.com_-
> ============================================================ _-
> contribution_-
> ===========================================================
Message 2
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Chuck-
It must be that since your engine and mine, they changed their
thinking on jet needles, and sent mine with only one groove.
I have all three float needles, and I concur with your reading of 1.5
oz on the "silver-springed" light needle. My "gold-springed" medium
needle scales at between 4-5 oz, and my "black-springed" high needle
is in the plane at this time, so I defer to your reading of 31 oz.
The silver, gold, and black colors are what I observed, and are not
"official" by Bing. They refer to the three needles as "float needle
light" , "float needle medium", and "float needle heavy." I ended up
with all three due to various fartings around with the carb. I'm
pretty sure the number of my main (#220) conforms to the size etched
on the carb, but as Andy said earlier.....
"You may also be unaware that Jabiru went through a phase a few years
back of
drilling-out jets to achieve the required mixture, so what was
stamped on
the jet wasn't necessarily the size of the hole.....This was from
memory on
2200s before the year 2000, or so, but ask your dealer as they have
factory
information (I'm afraid I don't at present). To compound the issues, my
understanding is that the sizes stamped on main jets don't correspond
to the
jet diameter, but on needle jets they do! This means a 2.80 needle
jet has a
2.80mm hole, but I'm pretty sure a 255 main jet isn't 2.55mm. I have
no clue
why this is."
.....that number may or may not be of value.
Lynn Matteson
Grass Lake, Michigan
Kitfox IV Speedster w/Jabiru 2200
flying w/490+ hrs
On Apr 28, 2008, at 10:15 AM, Chuck Deiterich wrote:
> <cffd@pgrb.com>
>
> Lynn,
>
> I am sure I have a needle with several grooves.
> When I replaced the float needle with one that has a stronger built
> in spring (black), I did not readjust the float. The spring in the
> old needle (orange) would compress at 1.5 Oz, while the spring in
> new needle takes 31 Oz to compress (yes 20 times more). This means
> that any compression of the weaker spring would effectively have a
> higher float level. Thus my float may be a bit low. The 255 main
> is larger than what Jabiru now puts in the Bing. SB 18-1 says mine
> came with a 250 but it did not, as the main jet size is scribed in
> the side of the carb body and on the jet itself. Lately they are
> using a 245 main jet. Needle jet sizes can be misleading as the
> needles used are different.
>
> Chuck D.
>
>
>>
>> Time: 04:47:22 PM PST US
>> From: Lynn Matteson <lynnmatt@jps.net>
>> Subject: Re: JabiruEngine-List: Float Level
>>
>>
>> The Bing manual for the carb says NOT to change the float (from what
>> they suggest) to cure a problem, but to cure the problem by
>> addressing either the main, the needle jet or the jet needle,
>> whichever "neighborhood" the problem resides in (my analogy). I've
>> read of guys who have adjusted the float height, but Bing says not
>> to. Are you sure you have a "lowerable needle"? Mine is not, having
>> only one groove for the snap ring.
>>
>
>
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