Regardless, I looked up the profile of the 6J needle that Glen mentioned and then visited Paul T's web site where I keyed in the major (10th digit) needle diameter for stations 2, 7, and 13.
It turns out that the 6J Stromberg needle is fairly close to the SU BB3 needle. Since apparently you can get a real 6J needle this is not helpful. However, I did this as an exercise to show that to a certain degree you might be able to find and adapt SU needles to provide the Stromberg profiles you are after. It will involve some detective work but might be possible.
Again... surely there is a reason this isn't suggested more often so please feel free to point out what I am missing.
Doug L.
--Previous Message--
: OK... I have a couple of questions.
:
: First, Glen, what is (or was) that
: device before it became your needle
: tool? Then... how do you use that
: tool (not the micrometer... the whole
: thing)?
:
: I don't have Stromberg parts around
: here to measure so again, I fall back
: to SUs. These are more naive questions
: and suggestions. I KNOW this has been
: asked before by others so please feel
: free to correct me and put me straight.
:
: With SUs needles the taper diameter is
: measured in thousandths of an inch
: every 1/8" along the length of the
: needle and I am assuming that is the
: way Stromberg needles are also
: characterized. If the inside diameter
: of Stromberg and SU jets are the same,
: could you not use SU needles in
: Stromberg carbs? Sure you would
: probably have to bush or turn down the
: mounting stem diameter but if the jets
: are the same size it could open up a
: whole world of possible needles.
:
: Since the link to Paul T's needle page
: was posted earlier, there is another
: one that you might find helpful. Once
: again, this is for SUs but it may prove
: useful (if not now... in the future).
: http://www.mintylamb.co.uk/suneedle/
: The Mintylamb utilities will let you
: graphically compare different SU
: needles. This gives you an idea how
: lean or rich one will be compared to
: another at various amounts of carb
: piston lift.
:
: Doug L.
:
:
:
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