Not much to add except it was done at idle rpm, with vac advance connected.
Bear in mind that this was/is with carb vacuum takeoff not manifold,
although I rediscovered the gauge I haven't yet found the instructions so
don't know if it covered manifold takeoffs.
If I am right in thinking that the two only differ at idle, and the carb
type effectively has no vacuum advance at idle, then I would say that
manifold vacuum should be disconnected and plugged while carrying out the
adjustment. It has always intrigued me that various manuals state that this
should be done anyway e.g. for the carb type as well as the manifold type.
Maybe as it doesn't make any difference with the carb type they decided not
to confuse the issue by trying to differentiate between them.
PaulH.
-----Original Message-----
From: Dan Pockrus <dpockrus@efficient.com>
To: 'Paul Hunt' <paul.hunt1@virgin.net>; mgs@autox.team.net
<mgs@autox.team.net>
Date: 26 January 1999 20:52
Subject: RE: Timing tricks
>> I always used to use a vacuum gauge to adjust the timing in
>> the 70s, and
>> recently rediscovered it and redid the B. You advance the
>> ignition till the
>> needle just starts to flick (misfire) then back it off 3/4 of
>> a degree.
>> Takes account of the actual conditions of your engine instead of the
>> summation of all possible worst cases that Bill mentions. Made a
>> significant difference to the performance and economy, and no pinking.
>>
>> PaulH.
>>
>
> Okay, Paul - I'm intrigued. Could you elaborate on this procedure
>for the uninitiated?
>
>Dan Pockrus
>'74 CBB
>
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