In a message dated 6/29/2006 2:41:42 PM Eastern Daylight Time,
mhooper@digiscreen.ca writes:
> Definitely running too rich and can't get
> the adjustment right. It seems to be a needle issue, although the carbs
> probably need re-bushing too
Mark,
There's a needle chart for Strombergs, SU's and Webers in the back of a book
on repair for those carbs by (I think) Haynes.....you can find the book for
sale at Amazon, etc.
I agree with a previous answer to your question by another list
member....most of us who have tweaked our TR6 motors for more performance using
a mild to
street to aggressive camshaft have found it necessary to feed the beast more
fuel than standard B1AF needles can provide. I have a triple carb setup and am
using Jaguar B1E needles for that very reason. After 3 years of fussing with
the needle settings to zero in best performance and still get around 20 mpg
(casual driving - less during spirited fun spurts!), I'm very happy with about
1
turn lean from full rich but that's me - each engine's fuel needs will vary.
I suspect that yoiu've got other issues if you're running too rich with your
new cam. Get back to basics - check the ignition system to be sure that
you're firing with a strong spark. Did you adjust the valves correctly using
the
valve lash specified by the new camshaft's manufacturer? Are the chokes
actually off when the knob is pushed in? Are the carb air valves lifting and
dropping smoothly without binding? Check all vacuum lines to the carb and
intake
manifold for cracks, pinches, etc. How's your ignition timing? Don't set your
timing by original spec (4 deg ATDC)....that won't cut it for even a stock
camshaft.....give yourself about 8 degrees BTDC as a starting point and begin
nudging in a degree or two advance but don't exceed 28 degrees TOTAL advance.
Good luck...I'm sure it's something simple...
Chip Krout
Delaware Valley Triumphs, Ltd.
Skippack, PA USA
'76 TR6 CF57822U
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