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As a lead on from post #99, I received the newly designed interface boards and made a short video of the working cdi with mods similar to PualC. Note I did not use his extra transistor or reed coil, instead I used a small relay direct on the hall signal open collector output. Works well as can...

Well intended Ray but if memory serves me correct, others have gone down this path where input is rampant and every second one wants something different. Result is it never gets completed.

Your link to "CDI Ignitions" is as old as, never worked properly and was the reason behind several more advanced attempts to rectify. "Carduino" I never saw before but "instructables" have a reputation of failed or incomplete or untested systems.

For starters they cost around $80 AUD.

Submitted the board design to JLCPCB for review before payment and there were a couple of issues with the layout. A bit new to this online pcb stuff so understandable I guess. Long and short of it, cancelled that one layout and presented another for review and it was acceptable. Panalized out...

Just post the reference you have .....people will do with it what they like. The more the merrier, someone might get some ideas from it. Cheers

Ok...thanks for the review. Multi cylinder or at least 9 cyclinder were not what I had in mind during the initial setups nor was it the original intention, however, good to see your ground work. Most applications are for the average engine builder who would seldom ever go above a single running...

Currently preparing a JLCPCB board to cover this arrangement as there have been a few calls locally interested. 5 boards with approx. 15 panelized on each, so plenty and at that rate relatively "next to nothing cost per board". Will advise when I have completed the arrangement.

Realistically, do you REALLY need this precision on a model engine. After all, it's just an indicator or do you intend incorporating atmospheric conditions in your microcontroller programming (I can think of at least 3 required) to be anywhere near accurate.

I don't have any copy of what you are referring to so cannot comment. Yes, in a single coil system, there would normally be just one hall effect to switch the spark. Dissy is used to distribute that spark from the centre pin to the surrounding pins at the right time, and in the right order...

Why not use a simple brake disc...?

Dissy distributes the high tension, not normally to do with any hall effect.......think you've something misunderstood there.

That is the statment of the day and most important.:)

Well, that was in the days of 36hp Holdens and the like, not exactly "race cars". Why does everything with you blokes have to be performance related to the Nth degree, they are model engines for crying out loud. Most are happy just at the fact that they will actually run. Point was as the...

I'd do the suck it and see approach. Jam in something close, then check with a timing light.

Dad had an old spark plug cleaner/tester in his workshop that cleaned the plugs via a sandblast. After cleaning one would check plug gap and refit to the tester. Air pressure was increased until the spark began to breakdown and reading taken. Visual was via an internal mirror setup.

As Ray says, he is playing with advance ******, the actual spark generation is already taken care of. If you use a standard run-of-the-mill ignition coil with the recommended voltages, deciding if you have enough spark inside is not a concern. Actually in some instances because of model use, too...

I don't suppose a few layers of Polyimide Kapton Tape would be of any assistance with your original adaptor...???

Seem to remember this type of thing with the 508 ic way back when. Someone Always wants it higher revs. One option that you might be able to apply is mount the magnet on the back of the hall effect and use a slotted metal disc or similar.

Learn how to read a manual micrometer, it's not that difficult. Most required can be read quite accurately with a $40 unit. For height guage I use an electronic vernier for simple convienience and remove the silver oxide cell at the end of the day.