[Rovernet] Using a Tach with CD ignition

[GeffMcCarthy]

OK, Franc, I'll bite:  Purge the Dull, Make Thyself Joyful!!??

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Geoffrey W. McCarthy MD MBA DipAvMed
677 NW Melinda Ave Portland OR USA 97210
503-241-8468(h) 503-799-3809 (mobile)

-----Original Message-----
From: Rovernet [mailto:rovernet-bounces at rovernet.org] On Behalf Of Franc via
Rovernet
Sent: Friday, December 19, 2014 11:37 AM
To: Dermot Harvey; Rovernet
Subject: Re: [Rovernet] Using a Tach with CD ignition



On 19/12/2014 19:12, Dermot Harvey via Rovernet wrote:
> Hi Group,
>
> I just fitted an Archerkit/Delta Mk10 Capacitve Discharge ignition to my
1971 TC2000. The system works OK but plays merry hell with the tachometer!
> I managed to dig out the assembly manual, but the hookup for Tachometers
is in a separate booklet!
> I know someone did this conversion in the last year or so, but cannot find
it.
> I would appreciate any help.
>
> Merry Christmas everyone.
>
> Dermot Harvey

    Hi Dermot,

    Yes, I'm still a lurker on here - I just don't often have anything
useful to contribute, not owning a Rover (other than Land Rover) any more.
This is a good opportunity just to say hello... ;-)

    A brief search online for the Delta Mk10 suggests it's not advanced
enough to be a multi-spark (MSD) system - if it was the tach problems might
be compounded, but it seems to be a simple CD type which works with the
standard points.

    Is your tach connected to the points or the output of the CDi unit? 
Either way, it may perform better connected to the opposite! Some tachs work
with the high-voltage pulse from the back-emf of the coil, others just
monitor the switch from 0-12v. Some odd ones (and I'm not familiar with the
TC2000, so don't know what sort it has, sorry!) work on a current loop in
series with the switched output to the coil. If you have one of those, I
would think it would work best on the output side, but the wiring
alterations may be a bit complicated if it's not there already - you would
need the schematic to determine what you have.

    Hope this helps. Likewise, Merry Christmas everyone!

    Cheers,
       Franc.

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