Are there any newer Ford EDIS modules that can be used and do I need any
  of
  the other parts of the ignition system ?
  The biggest junk yard here doesn't have any cars later than 1996.
  --
  Karibian


  Karibian, 1995 is the last year for the stand alone EDIS system which
  started in 1988 as the replacement for the DIS system. In 1996 the
  EEC-Iv
  engine computer (60 pin connector) was relaced by the EEC V (104 pin
  connector) which had the edis function added to the engine computer. For
  a
  rotary you need a 36 tooth reluctor wheel, two VR (variable reluctance)
  pickups and two EDIS-4 ignition controllers a 4 coil pack (Ford or
  Accel),
  and the plug wires. mount the VR sensors 7 degrees apart so that one
  EDIS
  fires 20 degrees BTDC and the other set fires at 27 degrees BTDC, Have a
  slotted hole mounting plate for the VR sensors for +/- 4 degrees on the
  fixed timing. Feed the two EDIS modules on separate breakers for a
  completely redundant ignition. Power will be down some on a single
  ignition.
   The application of these parts is well documented all over the
  internet, you should research this yourself for a better understanding
  of
  how many teeth before TDC the missing tooth of the 36 tooth sprocket is
  mounted, clearance of the VR sensor, 8000 RPM limit of operation. This
  is
  a
  very simple reliable system with only a few wires to sort. Thed EDIS 4
  module is available new from autoparts stores for about $37, Accel coils
  packs are about $69 and the VR sensor is about $18 Everything new for a
  redundant 2 rotor with plug wires is about $240.
  I plan on using a Ford EEC IV system on the four rotor and am
  using
  the EDIS 8 to get enough trigger signals to match the 80MM MAF sensor
  and
  eight 19 pound injectors and two EDIS 4 modules to run the ignition
  separately so that the EEC IV computer max RPM function won't reduce the
  ignition timing. Except for an inline potentiometer on the MAF 4.7 volt
  maximum input to allow lean cruise mixture the EEC IV will be all stock
  programming.


  george grimes


  Wouldn't this setup have wasted spark on the trailing plugs? I thought
  that was a no-no. Maybe I'm visualizing what you're saying wrong.


  Everett



  Everett, I am proposing using two of the EDIS controllers , one at 20
  degrees and one at 27 degrees BTDC firing two plugs each from the 4 coil
  pack. I intend to drill a piece of aluminum barstock tapped with 4 blind
  holes for the waste spark plugs to complete the coil circuit. These will
  be
  the waste spark plugs. There is a signal generated by the EDIS sensing the
  field collapse of the coils to verify that the plugs are firing. If a plug
  doesn't fire for a few seconds The EEC-IV would let the EDIS run on it's
  10
  degree BTDC Since I am using the two ignitions with fixed advance. I am
  not using the variable ignition advance so there is no connection to the
  ECU making the check signal redundant.The waste spark plugs may be
  necessary for the tach output from the EDIS to be correct. The EDIS also
  fires 3 times below 1800 RPM and once after that RPM.

  george grimes



  Ah, got it. Thanks.

  Everett

 George,

 Thanks for the explanation. Sounds like a very economical simple system,
 with redundancy, and all off-the-shelf parts. What's not to like?

 Mark S.

 Not enough sparks per combustion event :)
 First cost would be lower but one might make it up
 long term with a dual or triple MSD.

 Paul Lamar

Paul,

Couldn't the Ford EDIS be fed into an MSD ignition module to produce a
multi-spark ignition system?

Mark S.

Yes but you don't need it. Just three low cost ABS sensors in the three
rotor case with one just tit on the trigger wheel will do the job.

In Tracy's system if it puts out 3 pulses to fire the LS1 coil
that can be conditioned to fire 3 MSD systems.

Paul Lamar