One item you mentioned below needs some clarification.
The RX8 coil can not be used in a simple ignition as implied, because of the
2ms dwell time required. The trigger is at the rising edge of a 2ms square
wave, and coil firing is at the falling edge. This will give you a 90deg.
retarded ignition at 7500RPM.
I believe we talked about that already a few years back.

It would be nice, if someone came up with a simple electronic setup, without
a microprocessor, taking care of that.

Richard Sohn
N2071U
www.fairpoint.net/~res12/home.html

Real easy to do that Richard with a 555. It is called
a non-retriggerable one shot.

Paul Lamar

After thinking about this a lot more. It appears the cheapest
and easiest way to do it is use a very small computer by todays
standard the AVR ATtiny13A. One can buy them in an 8 pin dip.
Probably for about a buck :)

It will look just like a 555 as it has an internal clock
so no crystal will be required. This is the kind of computer
one would find in a steam iron or kitchen blender.

Its only job is to take in a bit from the CAS and decide when
to fire the ignition depending on RPM. That will keep the software
simple and easy to understand. The idea of this limited job idea
is computer hardware is cheaper than software if the software
is kept short and simple.

This a sub set of all the instructions but all the instructions one
needs to do this simple job.

I am still looking into what it takes to program them.
I may already have the development system.

Any questions so far?

BTW this is emerging as an essential device if you are using a carburetor.

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When fooling around with this sort of stuff an oscilloscope is essential.

The  Tektronic 2430 storage scope I have cost thousands of dollars when new.

Here is one that is truly amazing and dirt cheap.

http://www.youtube.com/watch?v=U8bXpzppdR0&feature=related

http://OscilloscopeApp.com/

Geek mind blowing! :)

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Not only do they have pad O-scopes. They now have O-scope probes with
audio mini jacks.

http://hmb-tec.de/HMB-TEC/Scope_Cable.html


Paul Lamar