Hmmm....
Thanks for all the detailed answers to Chip, Robert & Dick !
As usual, asking a question of the list points out the fact that I have most
likely been looking in the wrong direction. My car drives very nicely on the
highway, but seems to smell of fuel at idle. Then there is the fact that I was
told I'm showing some black smoke on takeoff. I do have the external oiling
line on a 3,500 mile rebuild, and a newly replaced vacuum retard too. Yet I
really have to have the choke on at cold start and until temp guage is well
showing before she won't starve at start-from-stop. A conflicting sort of
situation. Re-build time for the carbs I guess. Fortunately I have a couple of
kits sourced from an active list member. Time to use them it does appear.
Cheers,
Mark
________________________________
From: Chip19474@aol.com [mailto:Chip19474@aol.com]
Sent: Thu 29/06/2006 6:58 PM
To: Mark Hooper; triumphs@autox.team.net
Cc: 6pack@autox.team.net
Subject: Re: [TR] Stomberg needles
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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