Makes perfect sense to me. I'm about the change the needles on my V8 for
the reason you describe and have sorted the needles such that those with the
same idle size are grouped together, so I can pick a needle that is narrower
i.e. richer in the running positions.
PaulH.
-----Original Message-----
From: Paul Tegler <wizardz@amdyne.net>
To: MG Mailing List <mgs@autox.team.net>
Date: 21 February 1999 01:20
Subject: interesting rich lean SU needle theroy? statement?
>.....it is advisable when changing from one needle to another to choose one
>with the same idling dimensions. If this is not possible then bear in mind
>that if the new needle has weaker or larger idling dimensions ( say .089
>.0855) the rest of the needle will give slightly richer results than
>suggested by the dimensions. If the idling dimensions are richer or
>smaller(say.089 .0845) the needle will give slightly weaker results than
one
>would suspect. This is due to the alteration in the jet position required
by
>the new idling dimensions.
>
>If this is true (and to me... it now makes absolutely perfect sense)
>the present belief of going to ABD or AAA needles with K&N filters is
wrong!
>We should be looking at needles with larger numbered idle settings.(weaker)
>This would make us lower the jet position to get it to idle correctly,
which
>would richen the middle and upper settings..ELIMINATING THE NEED TO PULL
THE
>CHOKE OUT TO GET IT TO RUN SMOOTHLY WHILE CRUISING!
>
>Am I obsessing on trying to get even my BRAND NEW carbs to run right with
>open box K&N filters? does the original statement make sense to anyone else
>but me?
>
>
>Paul Tegler
>OB - 1973 MGBGT (Blaze Red, (orange))
>YB - 1973 MGBGT (Primrose Yellow)
>Millersville, MD (South of Baltimore, North of Annapolis)
>wizardz@amdyne.net
>http://www.amdyne.net/~ptegler/mgmain.htm
>
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