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Re: 25d4 advancer distributer on a 68 B

To: "Unger, Larry G" <larry.g.unger@lmco.com>
Subject: Re: 25d4 advancer distributer on a 68 B
From: Rene van Maanen <renevm@support.neth.hp.com>
Date: Wed, 09 Dec 1998 16:04:41 +0100
Thanks Larry,

I had no idea that there were son many advancer types.
So I have learned two things.

Rene

"Unger, Larry G" wrote:

> Rene van Maanen wrote:
>
> > Does someone know what the number of degrees is that the
> > vacuum advancer creates for the ignition?
> >
> > It's a 25d4 advancer distributer on a 68 B.
>
> Rene,
>
> Here is info that Kelvin posted awhile back ...
>
> > MGB     Dist#    Vac.#  Vac.Adv.  Type
> >
> > 18GF    40897  54411230 5.13.10  ported
> > 65-67   41288  54411985 5.13.10
> > 67      41290  54412170 5.11.7
> > 68      41288  54411985 5.13.10
> > 69      41264  54415625
> > 70      41288  54411985 5.13.10
> >
> > 71 18GK 41339  54414868 7.13.5   manifold
> > 72 18V  41370  54423989 7.13.3
> > 73-74   41491  54425359 10.15.5
> > 75      41599  54425516 10.15.5
> >
> > Note the change in advance characteristics in 1971.
> > The later units come in at a higher vacuum and gives
> > less advance.
> >
> > 10.15.5  = Movement starts at 10 ins of Mercury
> >            Movement stops at 15 ins of Mercury
> >            5 distributor degrees advance at maximum movement
> >
>
> Hope this helps ...
>
> **********************************************************
> Safety Fast! ... larry.g.unger@lmco.com
> '61 MGA 1600 MkII

--
Rene and Marion van Maanen
Netherlands Europe

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