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cffd(at)pgrb.com
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 Posted: Mon Apr 28, 2008 6:27 am Post subject: SB18-1 |
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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.
[quote][b]
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Lynn Matteson
Joined: 10 Jan 2006
Posts: 2778
Location: Grass Lake, Michigan
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| Posted: Tue Apr 29, 2008 11:55 am Post subject: SB18-1 |
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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:
| Quote: | 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_-
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_________________
Lynn
Kitfox IV-Jabiru 2200
N369LM |
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