Craig Wiper asked:
>I just decided to throw my Weber 32/36 downdraft back on the B. My SU's
>don't like the cold weather much. My question is: Is there an easy way to
>prevent dieseling when cutting the ignition with these carburettors? With
>the SU's many vaccuum ports I am able to prevent the dieseling by having the
>anti-runon valve attached. But with the Weber, I only have one vaccuum port,
>which attaches to the vaccuum advance on the distributor.
1) One could drill and tap the Webber's intake manifold
to accept a second vacumn line (most of the conversion
kits I have seen include a round flat spot on the top of
the manifold for this purpose), but this would force you
to remove the manifold to make the modification.
2) You might want to experiment with a Tee fitting on the
existing vacumn line, and connect both the vacumn advance
AND the anti-run-on valve, since the net pressure should
roughly equalize regardless of the details of the
connections. Please note that I have no idea of the net
effect of using an anti-run-on valve with a Webber.
3) To my knowledge, the vacumn port on at least the Webber
down-draft carbs is a very stange beastie when compared
to the usual set-up with dual SUs. The vacumn is a
steady (manifold) pressure with the SUs, but the Webber
carb vacumn port provides a "pulsed" vacumn, which tends
to frustrate the vacumn advance mechanism. I do not use
the built-in vacumn ports on either of my dual Webber
DGVs, I use a vacumn line on the manifold itself.
www.ill//somebody ple@se expl@:n th:s wwweb @address.bu:s:ness?
james fischer email@example.com