Message text written by INTERNET:jimmuller@pop.mail.rcn.net
>The close proximity of the vacuum hole to the
>throttle plate suggests that whatever effect it was supposed to do they
>wanted it to happen early in the throttle movement, suggesting that it was
>an idle-retard device. But I'm just guessing here. We don't know how
>progressive that vacuum would be with increasing throttle opening.
Well, I'd guess that both retard and advance need to be close to the throttle
plate when it is closed.
The retard needs to go away as soon as it comes off idle, so it ought to be on
the upstream side
just as the throttle cracks open. The advance needs to be "off" at idle and
then come on soon after by being uncovered to manifold vacuum soon after the
throttle cracks open. You are right that we do not know how
progressive the vacuum is supposed to be. I was hoping to use the progression
graph to 1) determine if it
is retard or advance, 2) decide how to modify things to get the timing "right"
with my current US distributor
and the UK carbs.
> What you don't
>know is how well calibrated its effect would be unless you get the exact
>match for that carb.
I was planning on getting a UK distributor to go with the UK carbs....
Either that or a MSD box that allows me to set the advance curve by hand!
-Tony
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