Is the vacuum advance still available?
Linda
Sent from my iPod
On Jun 12, 2013, at 8:05 PM, "GraemeS" <graemes@internode.on.net> wrote:
> First up, the vacuum advance is an emissions device.
>
> You can safely
> remove theB vacuum source and test drive the car.
>
> It only does its thing on
> cruise or trailing throttle, it does not
> contribute to engine power.
>
> The
> only caveat is you must BLOCK OFF the vacuum hose to prevent the
> engine from
> sucking in air when the vacuum port is exposed in the
> carb. throttle.
>
> For
> sure the vacuum advance mechanism in the distributor does
> eventually gum up so
> badly it is no longer operative.
>
> Providing the plates inside the mechanism
> are not pitted and
> groovedB by the tiny ball bearings, it should be reasonably
> easy to
> clean and re-lube so it all functions smoothly.
>
> The vacuum actuator
> is a different kettle of fish.
>
> If the arm doesn't operate when subjected to
> vacuum it is schtuffed,
> non-repairable.
>
> Once the diaphragm is holed or
> perished, game over.
>
> Suction by the human should be enough but a little
> vacuum pump is
> handy to see that things do operate correctly and more
> importantly,
> stay operated.
>
> i.e. with a constant source of vacuum, the
> mechanism should stay
> put,B not slowly return to normal, that indicates a
> vacuum leak
> somewhere.
>
> Let me know if you need any pics. and I'll email them
> to you
> directly.
>
> Regards, Graeme S.
>
> ----- Original Message -----
> From:
> "wattaj" @yahoo.com>
> To:"Roadster List"
> Cc:
> Sent:Wed, 12 Jun 2013 19:45:58
> -0700 (PDT)
> Subject:[Roadsters] Vacuum Advance Issue?
>
> Hello,
>
> I have an
> issue where at a steady highway cruise speed, just around
> 3000 RPM or higher,
> I get regular hiccups, sputtering, etc.. If I
> drop below
> 3000 RPM I am
> usually fine. The engine will pull strong all the way
> up to
> where I dare
> accelerate. I have always been suspicious of my
> distributors
> vacuum advance.
> Popping of the distributor cap, I tried to manually
> move the
> advance it by
> sucking on the tube, but it would not budge. I took the
> advance
> mechanism off
> the distributor and it was frozen stiff. After some
> serious
> pushing I got it
> to move manually, but would still not move under
> suction. It
> looks like I
> should replace the vacuum advance unit. I am curious if
> that
> might be the
> cause of my cruise speed issues? Thanks in advance (no
> pun
> intended) for the
> help.
>
> Cheers,
>
> Alan
> Tualatin, OR
> 67-1600
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