Both my V12 XJ-Ss are Lucas which pleases me. I find nothing basically wrong with the Lucas dizzy, it just requires a minimum of regular checking and maintenance.
The Marelli dizzy does seem to have more problems although with modifications and regular checking it can go the distance.
The 1988 convertible has Lucas of course, and so does the 1979 HE engined car but with a difference. The OEM Lucas amplifier in the 79 died not long after I bought the car in 1984. It was replaced with a Crane Cams V12 setup which had a much better amplifier and part of the kit was a 12 slot disc for the dizzy.
Now and again somebody on the forum raises the question of how to toss out the Marelli and change over to a Lucas dizzy. So how do you do it ?
I have a spare 12 slot Crane Cams disc and I will use that in the V12 HE engine I am almost finished rebuidling. The slotted disc is used in conjunction with a LED type pickup to provide ignition pulses. The standard Delco type CEI module can be used to drive any low impedance coil.
There should be a fair number of scrapped V12s which will yield a decent Lucas dizzy, that is the starting point.
I have a small business making electronic test gear and the LED pickup parts are all in stock. A suitable PCB to fit the dizzy is already designed since I have to make one anyway.
I have made a CAD file of the slotted disc copied from the Crane Cams one. Next time we order metalwork for production I can add one or as many as I like. Way back the kind of metalwok we use would be punched on a CNC turret press, like the U.S. made Strippit press. Trouble is for something like that slotted disc you would have to make a form tool to press it in one hit rather than the usual nibbling. Not a cheap deal.
How technology marches on. Up to a few years ago you could not laser cut aluminium which is what we use. Now there are CNC laser cutting machines can cut just about anything. So all our metalwork is simply cut with lasers from a CAD file, no tooling and very little prgramming needed. It is also precise, we have 3mm holes cut for Pem studs which have to be within 5 thou.
So if anybody is interested let me know and I will add discs. The plastic collar i could get made here too, although minimum sensible quantity would be 10 due to set up cost. I have a lathe so can make my own collar but not practical to make more.