Here is my new trigger wheel. I am getting it ready for a Lamar ignition demo at Sun N Fun in 2 weeks. It will also work with the RX8 CAS. Fires at 20 deg BTC and 4 or 5 times after that every 10 degrees of e-shaft rotation. Paul Lamar Here is my DC motor eng sim along with a movie and scope pictures. It is working and ready to go. You can see the six triggers on the scope. This is an ABS sensor about one fifth the cost of a Mazda CAS. Less than $20. They are manufactured in the millions and just about every car has 4 0f them. My 2 rotor ignition set up needs two. Paul Lamar


Paul.

In my cynical old age it takes a lot to excite me, but this looks good, outstanding even. Now can I claim any credit for some of this, after all I did tell you it was a great idea?? The trigger wheel is also so simple and easy to make. What about balance at 7500 RPM?? I assume that the computer can advance the timing as usual and then the Lamar unit still fires multiple times after that? Remember I am totally dopey, so explain clearly how I can hook this up to an existing ECU. Congratulations Paul.


Neil.

I did a crude static balance by inserting a shaft in the sprocket and rolling it
along two horizontal rails. A few adjustments in the hole sizes was all it took.


Yes it can be triggered by the computer. Unlike an inductive
system this fires immediate after the computer tells it to
fire. It has this in common with capacitor discharge systems.

The computer puts out a 5 volt pulse to the "smart" inductive coil about
2 ms before the coil needs to fire. So what you need is a circuit
that detects that down going part of the 2 ms wide pulse.
Some times called the trailing edge.

A simple capacitor will do this and a CD4049 inverter. It will take a
little experimenting  to get the right size cap.

Paul Lamar