Mark,
If you have a stock 1972 distributor, then you have vacuum retard not vacuum
advance. Some 72s (mine included) have both vacuum advance and vacuum
retard, but the advance is not hooked up. The port for the vacuum advance is
on the bottom of the carb.
Hope this helps.
- Hugh
> -----Original Message-----
> From: owner-triumphs@autox.team.net
> [mailto:owner-triumphs@autox.team.net]On Behalf Of Dave Massey
> Sent: Friday, June 21, 2002 8:16 PM
> To: Mark Hooper
> Cc: Triumphs Mailing List (E-mail)
> Subject: Checking vacuum advance
>
>
> Message text written by Mark Hooper
> >I have a distributor with only the vacuum advance on my 72
> TR6. Last night
> while tweaking the carbs a bit, I pulled the vacuum feed off
> the advancer
> just to see what effect the unit had on the idle speed.
> Apparently none at
> all. Is that normal? How should I check this thing? Does
> sucking on the
> pipe
> give enough vacuum to see the points mounting plate in the distributor
> move?
> Is there some way to measure if the advance is working well
> or poorly, or
> is
> it simply working or not?
> <
>
> Mark, if the vacuum is from a port on the top side of the carb (as it
> should) then you will see no change at idle. This is because
> this port is
> ahead of the throttle plate when the throttle is closed. It
> is positioned
> in such a way that once the throttle is opened this port will
> be behind the
> plate and will at this time see vacuum.
>
> You can typically create enough vacuum to see the plate move
> by sucking on
> the tube and if you do this while the engine is running you
> should see the
> speed increase. If it decreases then what you really have is a vacuum
> retard (typical if the US cars) and it should be plumbed to a
> port on the
> bottom of the carb that had vacuum only when the throttle is closed.
>
> Cheers
>
> Dave
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