----- Original Message -----
From: "Paul Root" <proot@iaces.com>
To: <paul.hunt1@virgin.net>
Cc: <mgs@autox.team.net>
Sent: Thursday, January 10, 2002 6:27 PM
Subject: Re: Pertronix ignition and coil
> paul.hunt1@virgin.net wrote:
> >
> > If you do have the Opus ('Opeless) system then you should already have a
> > solid-state trigger (magnetic) in place of points, which is all the
> > Pertronix is.
>
> Ok, what you are saying here is, 1) why replace the same with the
> same
> and 2) the Opus is junk. So that's a little confusing.
My understanding is that the Opus system consists of two components - the
magnetic trigger on the points plate and some electronics elsewhere in the
dizzie body. I would imagine the Opus got its reputation from the frequent
failure of the electronics rather than the magnetic trigger, so replacing
the Opus trigger with a Pertronix one won't improve that reliability. The
other thing is that the Pertronix is designed to energise the coil directly,
not via more electronics, which may cause it to work differently (i.e. cause
problems) to normal or not at all.
> I'm also believing the Pertronix is going to be more dependable.
I agree, it should be, but connected as the manufacturers intended i.e.
energising the coil directly.
> Ok, this is what I wanted. When I put the coil in I use the
> White, and by-pass
> the White/light-green. As to the resistor going into the
> distributor, that may
> or may not be used depending on the install instructions of the
> Pertronix. I'm
> guessing.
I very much doubt the Pertronix will have any information relating to the
use of it with an Opus system. If you want to keep the Opus electronics you
will have to retain the coil and power supplies as they are or risk
destroying the unit or making it non-operational. You would also have to
work out for yourself how to connect the Pertronix to the input to the Opus
electronics and not the coil, and you would be on your own there.
As I see it you only have two options - retain the Opus as is with the
original coil and wiring; or use the Pertronix as the manufacturer intended
and disable the Opus system completely, with either coil.
There are also extracts of the ignition wiring diagrams on the web site
below, select 'Spanners', 'Electrics', 'Schematics' and 'Ignition'.
PaulH
http://www.mgb-stuff.org.uk
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