Another option to do the same thing would be to find a shop that has one
of these or similar:
http://www.dynojet.com/automotive_dyno/
Their motorcycle units are quite popular and shops that have one are not
that hard to find. I
don't know about how plentiful the automotive units are. They, at
least with the MC units,
print out a nice graph of HP, Torque and the Air-Fuel Ratio. Dyno time
might be more cost
and time effective than track time.
An interesting downloadable PDF is here:
http://www.triumph-bonneville.com/images/Carb%20Jetting%20Info%202007.pdf
Although not directly 100% applicable to the SU's there is a graph that
shows the items that
effect the A/F ratio and over what portion of the throttle opening.
Does show how complex
perfection could be.
Not Healey or LBC but at least it is British.
Bob
55 BN1
63, 79, 06 Triumph MC's
60 Matchless
65 Royal Enfield
65 Norton
Alan Seigrist wrote:
>Ken -
>
>
>If you want to tune an SU carb's mixture at all different loads and
>RPMs, the only way to do it is to have a test track, a stack of
>different needles that run lean, and then drive the car around at
>successively different loads and speeds with a mobile gas analyser and
>then sand paper the needles down until you get correct mixture at all
>speeds and loads. Some people have done this with spectacular results
>in terms of mileage and power, but an exceptionally time consuming
>process.
>
>Alan
>
>'52 A90
>'53 BN1
>'64 BJ8
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