[Rovernet] Using a Tach with CD ignition

[Kent Kinard]

Geff, I am totally confused by your comment.  By way of introduction, 
Franc is the ECU guru I mentioned to you previously.  I couldn't find 
his email address...and here he is.  Ask him about your 4CU control box 
and if there is anything you can do to improve performance.
How is Julie?  Reply off list.
Roverly,
Kent K.

GeffMcCarthy via Rovernet wrote:
> OK, Franc, I'll bite:  Purge the Dull, Make Thyself Joyful!!??
>
> AvMedSafe
> 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.
>