Oops, this should read "as the jet" is raised and lowered, not the bearing.
Jeff
----- Original Message -----
From: "Jeff Fayne" <fayne@attglobal.net>
To: <Greg_Hutmacher@i2.com>; <mgs@autox.team.net>
Sent: Thursday, January 31, 2002 11:12 AM
Subject: Re: SU HS4 carb jet setting on 1968 MGB/GT
> Hi Greg,
>
> Here's a link to help you out, although written with a slant towards
> triumph's, it still applies to the MG's:
>
> http://www.vtr.org/maintain/carbs.html
>
>
> As the bearing is raised (mixture adjusting screw screwed clockwise as
> viewed from the bottom), the mixture becomes leaner. The needle, being
> tapered, allows more fuel to flow (mixture richens) as the bearing is
> lowered and the progressively thinner portion of the needle is exposed.
>
> A good staring point for the mixture screw is 2 full turns (12 flats) out
> from full lean.
>
> The list's very own Lawrie Alexander (Lawrie@britcars.com) (among
others)
> is a great source of SU related knowledge (as well as star of the Moss SU
> rebuild video). I'm sure he would be open to answering the occasional
email
> or via posting to the list.
>
> Also, Haynes put's out a nice SU manual (although disguised as a Weber
Carb
> manual) called "Weber Carburetor Manual, Including Zenith Stromberg and SU
> Carburetors" ISBN 156392157. I bought mine at the local PEP Boys, I'm
sure
> it's available ate Borders, Amazon, etc.
>
> Good luck
>
> Jeff
> '70B
>
>
>
> > On the SU HS4 carbs, looking at the height of the jet inside the jet
> > bearing, what is the relationship in terms of rich/lean mixture with the
> > jet higher or lower in its bearing? In other words, as I adjust the jet
> > upward inside the bearing, does that make the mixture more rich or more
> > lean? Is there a general wisdom on what height to start with for a
> > nominal mixture setting? I'm about to put the carbs back together and
> > right now I have it flush with the top of the bearing.
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