tjs22t(at)verizon.net
Guest
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 Posted: Tue Jun 10, 2008 7:47 am Post subject: "leaning" the Bing carby |
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Juan,
I think you're talking about the "economy tuning kit" that Jab put forth a while ago to improve fuel economy. Following that procedure of re-jetting and drilling out some small passage (ask Pete or see back issues of JabbaChat), fuel burn did go down. It was not recommended for engines in the early serial # range, which mine is, so I have never done it. The jetting of old engines was hit-and-miss with the jets in mine having been drilled out by the factory(?) when purchased. My main jet actual diameter (checked with numbered drill bits) was not what was marked on the barrel of the jet. Same for needle jet.
The only way to truly lean a carb is to have mixture control. Since the Bing is an altitude-compensated carby, no way of leaning it in the air is possible. If you fly with a Jab and try for 1400F EGT, you're really just flying at an RPM that gives you that temp. When you said you leaned past peak I assumed you had installed an Ellison or AeroCarb, both of which come with mixture control. Would be nice if the 3300 had fuel injection.
tailwinds jeff do not archive
>I HAVE A BING. YOU LEAN THE ENGINE USING EGT. 1400 with a certain size leaned
needle jet.
-----Original Message-----
| Quote: | From: THOMAS SMALL <tjs22t(at)verizon.net ([email]tjs22t(at)verizon.net?subject=Re:%20question%20for%20Juan&replyto=28253192.1213108469312.JavaMail.root(at)elwamui-rustique.atl.sa.earthlink.net[/email])>
Sent: Jun 9, 2008 9:54 PM
To: zenith-list <zenith-list(at)matronics.com ([email]zenith-list(at)matronics.com?subject=Re:%20question%20for%20Juan&replyto=28253192.1213108469312.JavaMail.root(at)elwamui-rustique.atl.sa.earthlink.net[/email])>
Subject: question for Juan
Hi Juan,
You mention "lean of peak" with your Jab. Have you an Ellison or an Aerocarb
(or perhaps one not familiar to us) instead of the Bing original. How do you
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like it?
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cheers jeff do not archive
>set the plane for 5 gal/hr burn at lean of peak EGT,
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[quote][b]
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