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Re: SU HIF Needle Swap Question

To: MG Nuts <>
Subject: Re: SU HIF Needle Swap Question
From: Skye Poier <>
Date: Mon, 30 Sep 2002 10:58:35 -0700
I'm sure I've read that you can put fixed needles in the HIF.  I just
can't remember where.  It might have been "How to Power Tune"


Word on the street is Christian, Skip said:
> Hello Group.  I'm trying this again after sending the first one to the wrong
> group.  Has anyone tried putting a "fixed" (i.e.. unbiased) needle in an HIF
> carb ??  I've been told that HS and HIF carbs are completely different.
> However, the SU book shows some common part numbers.  It looks like the
> needles and what Moss calls the "air chamber & piston" (what the jet
> attached to) might work on both types of carb.  Since the HIF carbs use a
> spring to bias the needle to one side, I'm betting that the jet is already
> centered.  Anybody know for sure ?????????????
> What I'm trying to do is set my '74 up exactly the same way as the early
> MGBs to duplicate their top end power and throttle response.  I'm not trying
> to build a racer.  Would like to use the "fixed" needles because they're
> shorter and provide full (.090) fuel flow at full air flow (the last three
> needle stations).
> Thanks in Advance,  Skip  '74 MGB

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