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Subject: Re: [FlyRotary] Re: Ford EDIS ignition systems
Date: Mon, 02 Jul 2007 18:39:43 -0400
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From: wrjjrs@aol.com
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Ernest,
It sounds good reguardless of new or used parts. FYI the comment from=20
Mazda is that loosing the trailing plugs, on a split firing loses 25%.=20
Loseing the leading plugs causes a 75% power loss. Depending on=20
airframe -75% may not be flyable. The racers notice no change in power=20
firing both plugs at the same time. Firing split WILL improve=20
efficiency slightly. It all depends on what you want to do. Two cheap=20
units might make me do a redundant setup using both systems to fire=20
both plugs. You would have to have alternate holes (4 cylinder) wired=20
to the same coil anyway if that will work. The firing order is similar=20
to a 4 cylinder but the #1 would fire chamber #1 and #2 would fire=20
chamber #2 which is normal. Then #3 (4 cyllinder) would fire chamber #1=20
and #4 would fire chamber # 2. Unless you were going to use one of the=20
early systems with a distributor. If you planed on using C.O.P. you=20
would be forced to cross wire them. This is my biggest worry when using=20
a system not designed specifically for the rotary. I'm not sure if=20
wasted spark units would work at all. There is no reason a automotive=20
system wouldn't work, IF they can run the coils alternately. The=20
question I have is if the #3 coil lead is "ON" while the #1 is firing=20
to allow longer rise time. If it is, electronically done this way I=20
don't know if the unit would work at all. I'm hoping it would because=20
I'd love to use a inexpensive system on my 20B at least to mock up my=20
cooling. Probably Tracy's unit later. This is a problem for many=20
transplanted car systems. Because other than the original Mazda unit=20
few of the systems would deal with the multiple injection and ignition=20
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:=A0
> Ernest,=A0
> with C.O.P. why couldn't you fire both plugs at once by paralleling >=20
the two coils? They have a trigger circuit if I recall correctly. The >=20
draw on the trigger shouldn't be much. You could run 2 boxes if you >=20
want, but only 1 would be needed.=A0
> Bill Jepson=A0
I believe what you're saying is to use the EDIS-4 coil pack. It drives=20
two plugs per side, and I could just fire the leading and trailing at=20
the same time.=A0
=A0
It's workable...and simple. But I loose the redundancy and the split=20
timing. While the benefits of the latter are questionable, the former=20
is not, especially since I'll be using used components.=A0
=A0
In the event of a power outage, or computer failure, the sparks will=20
run independantly. I'm going to run an extra, manual-valve controlled,=20
gravity fed fuel line to the intake that will let me "pour' fuel into=20
the intake. That's my backup to the injectors. My previous calculations=20
for endurance bus alternator out event was 20Amps. These modifications=20
will help me push it down closer to the <10 that I want it to be.=A0
=A0
--=A0
Homepage: http://www.flyrotary.com/=A0
Archive and UnSub:=20
http://mail.lancaironline.net:81/lists/flyrotary/List.html=A0


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