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Date: Mon, 02 Jul 2007 14:11:21 -0400
From: Ernest Christley <echristley@nc.rr.com>
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To: Rotary Engine <rotaryeng@earthlink.net>,
        Rotary motors in aircraft <flyrotary@lancaironline.net>
Subject: Re: Ford EDIS ignition systems
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Rotary Engine wrote:
>
> I am looking for a stand alone ignition system to use with my mechanical
> fuel injection.
> Does anybody have an experience with this system. I understand that 
> all it
> needs is power and a input from a trigger wheel. The units and the 
> trigger
> wheels can be found in junk yards I am sure. I can also make a trigger 
> wheel
> with a plasma cutter.
>
>
>
>
> Paul,
> I am off to a customer meeting, when I return I will call you to go over
> ford system. It does require a computer, and the computer is firing the
> coils. Available in single coil on plug style as well as lost spark 
> systems
> with wires. Obviously the coil on plug has the least possibility of radio
> interference. The only parts we could use easily on a rotary is the coil
> packs and pick up sensors.
> Larry
>
> We might be able to trick the EDIS to think it was connected to a 
> computer.
> Ernest has a O-scoop so perhaps he can tell use what data the Megasquirt
> must send to the EDIS.

-Ernest has no oscilloscope, though I can borrow one.
-The timing wheel can be bought for about $20
-The EDIS module does not require a computer to operate.  It receives a 
"SAW" signal from the computer which it will use to modify the spark 
advance.  If it doesn't receive a signal for 5 cylinder events, it will 
run the engine in standalone mode with 10degrees of advance.  If you lie 
to the EDIS by moving the VR sensor you can add an arbitrary amount of 
advance.  Setting it ahead by 15 degrees would give the rotary a static 
advance of 25, which it is supposed to run with happily at all RPMs.  In 
setting up the Megasquirt to drive the EDIS, the first test is to verify 
that the EDIS will run the engine without the Megasquirt connected to it.
-The rotary requires two EDIS-4 modules, because the trailing plugs 
can't be run in trailing spark mode.  This is actually not a bad thing. 
    *You get the reliability of full dual electronic ignition that will 
run without computer input if they need to. 
    *No wasted spark conserves battery power if you lose the alternator. 
    *The VR sensors will have to be mounted close together, but you will 
get 5 degrees of separation.  Perfect for driving the trailing plugs.
    *The EDIS in this setup will drive one coil per plug, even if it is 
a COP (coil on plug).
    *Boost Engineering says that I can get all the EDIS parts for less 
than $159.  I'm still trying to work out how to make payment.