----- Original Message -----
From: "Telewest (PH)" <paul.hunt1@blueyonder.co.uk>
To: <bill.marianna.graham@attglobal.net>; <mgs@autox.team.net>
Sent: Monday, June 02, 2003 3:58 AM
Subject: Re: Ignitor effect on tach
> I have seen waveforms of
>Pertronix ignition and it had a much longer period of oscillation or
'noise'
>than standard points.
>This noise will cause multiple pulses at the tach,
> and if the duration exceeds that which the tach is expecting it will cause
> high readings.
>
> ----- Original Message -----
> From: <bill.marianna.graham@attglobal.net>
> To: <mgs@autox.team.net>
> Sent: Sunday, June 01, 2003 12:21 AM
> Subject: Ignitor effect on tach
>
>
> > I just had an Ignitor installed in the distributor of my 71 B roadster.
> > Now my tach in reading extemely high. For example, it now reads 4000 rpm
> > at 52 mph rather than about 2900 it should. I've had an Ignitor in a Jag
> > for 6 years with no problems. Any suggestions on how I get the tach back
> > to normal?
>
Bill: Which Ignitor was installed (original or the Ignitor II)?
Paul: Which Ignitor version did you scope?
>From what i've read the Ignitor II uses a microprocessor to dynamically
adjust the dwell to suit the rpm. If the original Ignitor has the
oscillation noise that Paul has seen, I would think (hope), the II version
would fix that with improved filtering.
I'm comtemplating installing the Ignitor II in my 70B and would like to
hear from others who installed this version.
Thanks
Jeff
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