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Ernest,
It sounds good reguardless of new or used parts. FYI the comment from Mazda is that loosing the trailing plugs, on a split firing loses 25%. Loseing the leading plugs causes a 75% power loss. Depending on airframe -75% may not be flyable. The racers notice no change in power firing both plugs at the same time. Firing split WILL improve efficiency slightly. It all depends on what you want to do. Two cheap units might make me do a redundant setup using both systems to fire both plugs. You would have to have alternate holes (4 cylinder) wired to the same coil anyway if that will work. The firing order is similar to a 4 cylinder but the #1 would fire chamber #1 and #2 would fire chamber #2 which is normal. Then #3 (4 cyllinder) would fire chamber #1 and #4 would fire chamber # 2. Unless you were going to use one of the early systems with a distributor. If you planed on using C.O.P. you would be forced to cross wire them. This is my biggest worry when using a system not designed specifically for the rotary. I'm not sure if wasted spark units would work at all. There is no reason a automotive system wouldn't work, IF they can run the coils alternately. The question I have is if the #3 coil lead is "ON" while the #1 is firing to allow longer rise time. If it is, electronically done this way I don't know if the unit would work at all. I'm hoping it would because I'd love to use a inexpensive system on my 20B at least to mock up my cooling. Probably Tracy's unit later. This is a problem for many transplanted car systems. Because other than the original Mazda unit few of the systems would deal with the multiple injection and ignition events into the same chamber.
Bill Jepson
-----Original Message-----
From: Ernest Christley <echristley@nc.rr.com>
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Sent: Mon, 2 Jul 2007 2:55 pm
Subject: [FlyRotary] Re: Ford EDIS ignition systems
wrjjrs@aol.com wrote:
Ernest,
with C.O.P. why couldn't you fire both plugs at once by paralleling > the two coils? They have a trigger circuit if I recall correctly. The > draw on the trigger shouldn't be much. You could run 2 boxes if you > want, but only 1 would be needed.
Bill Jepson
I believe what you're saying is to use the EDIS-4 coil pack. It drives two plugs per side, and I could just fire the leading and trailing at the same time.
It's workable...and simple. But I loose the redundancy and the split timing. While the benefits of the latter are questionable, the former is not, especially since I'll be using used components.
In the event of a power outage, or computer failure, the sparks will run independantly. I'm going to run an extra, manual-valve controlled, gravity fed fuel line to the intake that will let me "pour' fuel into the intake. That's my backup to the injectors. My previous calculations for endurance bus alternator out event was 20Amps. These modifications will help me push it down closer to the <10 that I want it to be.
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