[Mgs] manifold vacuum

[Phil Marcell]

Does anyone suggest gasket seaker on the maniforld gasket.  Mine leaks with 
a new rebuild & a Moss supercharger.

Phil
----- Original Message ----- 
From: "Paul Hunt" <paul.hunt1 at blueyonder.co.uk>
To: "Ed Woods" <fogbro1 at comcast.net>; <mgs at autox.team.net>
Sent: Thursday, July 23, 2009 9:08 AM
Subject: Re: [Mgs] manifold vacuum


> Sounds about right, it depends on the damping as to how much flutter you 
> get.
> My Redex gauge has a damper screw on the pipe on the back of the gauge to
> compress the tube and eliminate the fluttering for driving, you open this 
> up
> when tuning and diagnosing for greater sensitivity.  It's difficult to
> describe the difference between flutter and pulsing due to a defect, 
> except
> the fluttering is regular whereas a downward pulse occurring just one beat 
> in
> four is a cylinder defect.  If you have fluttering and pulsing then you
> probably do have a problem.
>
> If you have manifold vacuum then *any* distributor will increase the speed 
> and
> advance with the vacuum connected at idle compared to disconnected, this 
> is
> because there is near full vacuum at idle with manifold vacuum, as opposed 
> to
> zero with carb vacuum.  16-17 degrees of vacuum is more than the maximum 
> point
> for any MGB distributor, which varies from 8 in Hg. to 15 in Hg, so you 
> will
> be at maximum vacuum advance, which can be anything from 6 to 24 
> *additional*
> degrees.
>
> PaulH.
>  ----- Original Message -----
>
>  What's the expected manifold vacuum on the MGB at 900 rpm? Mine's reading
>  16-17. Should it be rock steady or is a variation of 1 inch acceptable?
>
>  Anybody out there using a Pertronix distributor? With the vacuum advance
>  connected, "idle" speed goes to 2000 and ignition advance to 30 degrees 
> from
>  a 7 degree advance when disconnected!
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