Progress? For my carbed 1970 911T, distributors are getting hard to find, and quality coils are getting impossible to find...

I have it in my head to go crank trigger and coil-on-plug, but it runs up against the very slippery EFI slope rather quickly...

Yes, I got that....my question presently is about the wires.... with a conventional coil can one use spiral wound Clewett style wires or does one have to use the solid stock coppers?

Either will do.

Well we have a design for a new CDI coil and we have been testing on dyno and a few 911 race cars over here. We handmade around 20 for test.

One of our test engines is a Cosworth DFV F1 engine which revs to 11,000 RPM. Originally, these engines had a CDI ignition made by Lucas but they are getting old and unreliable now after years of repair. We are working on re-engineering these units.

We just need to find a way to streamline the coil manufacturing.

Thank you.

Jonny, If you ever get a schematic of the Lucas CDI, I would be interested in seeing how they went about it, just for curiosity's sake. That's the company that at one time stated they would never use CDI, and nor would they sell ignition components to anyone that did. Thanks, Fred

Sure! I don't have a schematic currently but do have an actual unit and have reverse engineered some of it. It's pretty similar to the Bosch but the PCB is a bit more modern - 70's rather than 60's, same charge capacitor value although two caps in parallel. It has a rev limiter that is adjustable on a turn pot. Also has an input to retard the ignition for starting. The coil is mounted inside the casing with the electronics which is unusual. The decision to mount the ignition box in the centre of the V was a little odd.

One of the greatest F1 engines of all time!

<p><a href="https://commons.wikimedia.org/wiki/File:Cosworth_DFV_in_Tyrrell_008.jpg#/media/File:Cosworth_DFV_in_Tyrrell_008.jpg"><img src="https://upload.wikimedia.org/wikipedia/commons/thumb/b/ba/Cosworth_DFV_in_Tyrrell_008.jpg/1200px-Cosworth_DFV_in_Tyrrell_008.jpg" alt="Cosworth DFV in Tyrrell 008.jpg"></a><br>By I, <a href="//commons.wikimedia.org/wiki/User:Pyrope" title="User:Pyrope">Pyrope</a>, <a href="http://creativecommons.org/licenses/by-sa/3.0/" title="Creative Commons Attribution-Share Alike 3.0">CC BY-SA 3.0</a>, <a href="https://commons.wikimedia.org/w/index.php?curid=2529677">Link</a></p>

11000 rpm on a V8 is one heck of a spark rate (733 sparks/second). I would have expected a different design, but with a small discharge capacitor and special coil it could work, or perhaps it switches out one of the parallel capacitors at high rpm? Anyway, very interesting, Thank-you

hi Jonny, any update on the coil availability?

Best,

Matt

Another coil update bump. Installed a new Bosch coil made in Brazil and it crapped out on me today on a drive before i could even fit the cdi+. What options are there outside of those coils for a 79-930?

Msd hi vibration coil 8222? Can be installed upside down and you can get it in black. Have it in our 72 but also using an msd box though posts here indicate it is a direct replacement. Peel off the decal.