On 05/18/2011 06:31 PM, josrph berki wrote:

Ernest,

 

Thanks, I have looked at the various megasquirt sites but have you found one that provides one with how to make it work in an aircraft application? 

Shh!  My engine doesn't know it's in an aircraft.  Please don't let on.

What signals / sensors should be used and with those that are not, what do you do with the sensor hardware or software to not use that particuliar sensor?

I am using a P Port and will most likely have to average the MAP via hooking the oil injector ports together through an orifice.

 

I also had a MAF in the intake system but may have to take it out.

 

MS can use the MAF, or the MAP and intake air temp sensors using the Speed/Density algorithm for computing fuel.  The coolant temp is also a necessary input.  Other sensors can be wired in and datalogged.  It is just some settings in the tuner software.  I'm going to run blended Alpha-N mode for the fueling algorithm.  Basically, the throttle becomes a gas control, with the barometer reading, which will be connected to the static port, adding a nudge factor.  I'm setting it up with the throttle position sensor in the throttle handle, and 30% of the movement of the handle is after the throttle plate is fully open.  It will be tuned very lean with the plate partially closed and then get progressively richer to max power with the throttle full forward.

Did you choose the EDIS because you have a way to back it up?

Partially.  The other reason is that the units have a proven track record of reliability.

 I will have to use a trigger wheel on the Eshaft because I eliminated the CAS due to space constraints under the cowl.

I made an aluminum adapter and mounted the trigger wheel on the eshaft in place of the pully.  I cast some aluminum mounts for the VR sensors.

Do you have any info on how to make the EDIS work on the rotary?

There is quite a bit of data out there.
http://www.megamanual.com/ms2/EDIS.htm
http://www.forum.canardaviation.com/showthread.php?t=3234
http://www.msextra.com/forums/viewtopic.php?f=101&t=29904

And that was just a quick google search.  To keep it simple:

1) Get an EDIS-4, a trigger wheel, and the 4 position coil pack.  Mount the trigger wheel so that the missing tooth is at the top with one of the rotors at TDC.  Doesn't really matter which one, as the thing is going to fire every 180* regardless.  Just be consistent in which one you call #1.

2) Count 9 teeth going clockwise looking at the trigger wheel.  Mount the VR so that it points at that tooth, and it will fire at 10*BTDC.  One more tooth is another 10*.  You're engine will be happy with that from cranking to 9000RPM. (That last sentence is so obviously stolen from someone intelligent, I orta put it in quotes 8*)

3) Plug the EDIS-4 into the 4-coil pack.  It's a keyed connector.  You can't do it wrong.  I tried.

4) The plug wires connectors are numbered on the coil pack.  1 and 4 go to the #1 cylinder.  2 and 3 go to the other.  If you get that backwards, you won't know by running the engine.  When you try to check it with a light, your timing mark will be on the other side of the wheel.  Either change the wires to the correct cylinder, or time off the other one.

5) You've just spent about $100 (http://www.boostengineering.net/category_s/1.htm) on an ignition system (all the parts between battery and the spark plugs). Shoot!  The even had the plug wires for $15.  I paid $50 or mine at Autozone.