william m.,
the vac. advance is meerly to hold the breaker plate still by that point!
go with the 23deg, cam and if ya want, plug the advance uint's hole to keep
spiders from moving into it and using it as a bug condo.
chuck
30 years with the same darn bugeye! (it must be love?) LOL!
> [Original Message]
> From: William M. Gilroy <w.lists@verizon.net>
> To: <spridgets@autox.team.net>
> Date: 10/28/2004 1:17:26 AM
> Subject: Advance curves
>
> I was rebuilding a dizzy for my MG to night and I noticed a couple of
things.
> As I looked through the parts bin I found on 45D dizzy that had 23 degree
> advance curve. I also had a late model electronic 1500 dizzy (maybe a
76)
> and took that apart and it had a whopping 9 degrees advance. Quite a
range.
>
> Since my car is not longer stock I am going to go with the 23 degree
advance.
> When I am done I would like to get it on a dizzy machine and see if it is
23
> degrees and when it hits full advance.
>
> Now for the question, if you have a mechanical advance of 23 degrees how
does
> the vacuum advance play into the equation? Are the two numbers just
summed?
> What is the advantage of the vacuum advance? I guess I need dizzy for
> dummies.
>
>
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