Max is right. SU needles are thickest at the shank i.e. idling, and
thinnest at the tip i.e. full throttle.
PaulH.
-----Original Message-----
From: Max Heim <mvheim@studiolimage.com>
Cc: mgs@autox.team.net <mgs@autox.team.net>
Date: 29 September 1999 04:45
Subject: Re: Air filters [now Needles]
>Dan Dwelley had this to say:
>
>>Thinner needle equates to smaller fuel port which equates to less fuel
which
>>leads to a leaner mixture.
>>
>Really? I had it visualized the opposite. I thought of the needle as a
>plug in a hole. Where it is thicker, and fills the hole tighter, there is
>a smaller ring-shaped opening around it for fuel. Where the needle is
>thinner, and fits looser, there is more open area, and therefore more
>fuel flow.
>
>It would be like the difference between the little Dutch boy putting his
>thumb in the hole in the dike, or his little finger. Presumably, there'd
>be less water flowing around his thumb than around his little finger.
>
>But I can't lay claim to any particular knowledge. So, how does it work?
>
>
>
>
>
>
>
>>On Tue, 28 Sep 1999 14:17:02 -0700, DENNIS COX wrote:
>>
>>> Oh yea, forgot to mention... I also installed the #6 needles. I beleve
>>> they are thinner.. richer...
>>>
>>> Dan Dwelley wrote:
>>> >
>>> > Make sure you use a fatter needle on your carbs! You'll get a
>>horsepower
>>> > gain but you need to compensate the fuel for the extra air flow.
>>> >
>>> > Dan
>>> > 77 Midget
>>> > Alexandria, Va.
>>> >
>
>
>--
>
>Max Heim
>'66 MGB GHN3L76149
>If you're near Mountain View, CA,
>it's the red one with the silver bootlid.
>
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