Solution for running MJLJ on a rotary...?

[ribs]

On a long trip with my drummer to guitar center on the quest to buy better microphones for a recording project that starts tomorrow, instead of listening to him babble about how bad everybody drives, I was deep in thought, wrapping my head around a problem that has nothing to do with my MJLJ application, but anyways, here is my idea.

To run MJLJ on a rotary, what I believe one would need is two 6 cylinder coil packs, two 6 cylinder motocraft EDIS controllers, one reference wheel, two magnetic sensors, and one MJLJ. My idea was to have each rotor driven off of a different EDIS controller/coil pack. With wasted spark, each EDIS system would fire 3 times per revolution, 120 degrees apart (I guess...never really looked at a 6 cyl as all I have owned is 4 bangers and rotarys, but it makes sense to me) which is exactly what is needed to get each rotor to spin around.

The two sensors would have to be mounted as follows; one where it is usually mounted (90 deg BTDC?) and one 30 degrees (again, I guess...not too sure about the rotary, but that is my understanding of it) out from there, to give proper reference for firing position of front and rear rotors.

To get three coils to drive one spark plug, I suppose one could make a convoluted hacked together spark plug wire with 1 spark end split to 3 coil ends (don't know what the effect of 30,000 volts or so going to the coils each time would be), or one could hack apart the EDIS coil pack and make one coil fire from the three signal leads, which would probably be the more elegant solution.

I will guess from my 2 minute overview of how MJLJ works that there is an input from the EDIS system, which could be driven off of the properly aligned (90 deg BTDC?) EDIS controller, and the output for advance/retard could be split to drive both EDIS systems.

Has anybody thought of this approach before? Any ideas on if it would work or not? Comments? Thanks for reading.

-rich

'86 MR2
'86 951

[brentp]

Interesting. Initial thoughts is that you'd need as many MJLJ modules as you'd have EDIS modules- you don't want one MJLJ module to send a signal to multiple EDIS modules. In the Rx7 situation, the EDIS modules will fire their "advance request" (PIP) signal at different times, and the response coming back from the MJLJ module needs to be during a certain time window; in my case I reply back immediately.

[ribs]

Could you use the one MAP sensor to send a signal to two MJLJs? I was thinking that by having the same MAP signal across two MJLJs, you could avoid calibration problems with different MAP sensors, therefore you could load the same values in both MJLJ's and expect them both to advance/retard identically. Maybe it would work...too bad my old RX-7 went to the junker 7 months ago, otherwise I would be inclined to give it a shot.

-rich

'86 MR2 getting a 4A-GTE, MS, and MJLJ

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