Return-Path: Received: from [24.25.9.100] (HELO ms-smtp-01-eri0.southeast.rr.com) by logan.com (CommuniGate Pro SMTP 4.2b2) with ESMTP id 3196459 for flyrotary@lancaironline.net; Wed, 28 Apr 2004 23:12:23 -0400 Received: from EDWARD (clt25-78-058.carolina.rr.com [24.25.78.58]) by ms-smtp-01-eri0.southeast.rr.com (8.12.10/8.12.7) with SMTP id i3T3CKSn008906 for ; Wed, 28 Apr 2004 23:12:21 -0400 (EDT) Message-ID: <000901c42d97$ca8e1fc0$2402a8c0@EDWARD> From: "Ed Anderson" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] ECU wiring Date: Wed, 28 Apr 2004 23:12:21 -0400 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0004_01C42D76.4259AAA0" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2800.1409 X-MIMEOLE: Produced By Microsoft MimeOLE V6.00.2800.1409 X-Virus-Scanned: Symantec AntiVirus Scan Engine This is a multi-part message in MIME format. ------=_NextPart_000_0004_01C42D76.4259AAA0 Content-Type: text/plain; charset="Windows-1252" Content-Transfer-Encoding: quoted-printable I'll take a stab at your questions, Paul. Ed Anderson RV-6A N494BW Rotary Powered Matthews, NC ----- Original Message -----=20 From: "sqpilot@earthlink" To: "Rotary motors in aircraft" Sent: Wednesday, April 28, 2004 10:25 PM Subject: [FlyRotary] ECU wiring > Hi, fellow rotary enthusiasts. My 13b is running pretty well with my = Micro > Tech ECU. I keep thinking that even though it's running OK, I might = have > something wired incorrectly, or that could be improved upon. I know = that > most of you are using Tracy's ECU, but since they both accomplish the = same > task, I thought I could ask a couple of questions to compare my system = to > Tracy's. > The wiring schematic shows a red wire going from the positive = side of > the battery, through a 30 amp fuse, and to one side of the injectors. = That > would put power to the injectors at all times, even if the ignition = switch > is in the OFF position. I understand that the injectors, however will = not > fire until the ECU sends a ground signal to the other wire on the = injector. > Is this common practice? Does Tracy's system work in a similar = manner? The two fuel injection systems I have employed (HALTECH and Tracy's EC2) = both have power directly to the inejctors. The injectors should not = activate or consume any power unless the ECU is operating - that is = grounding one of the leads to each injector. I do have a 30 amp circuit = breaker in my injector power line I personally would not want that line going through my ignition switch. = There is pulsating voltage on that line when the injectors are firing = and running that wire around under your instrument panel could increase = the chances for electronic interference. Too many circuits tied to the = ignition switch is something I would also avoid. > The schematic shows the red wires that go to the 4 Bosch coils = goes > through the ignition switch first. That made sense to me. That sounds reasonable to me as well. Although in my case, the power = to my Mazda coils also goes through a CB and not through the ignition = switch. Basically, my ignition switch does one thing , it enables the = starter button. My power to my Ec2 is controlled by a toggle switch = which also provides power to my starter contactor - so both my keyed = ignition switch (actually starter enable switch) and my EC2 toggle must = be on for the engine to be started by pushing a starter button. A = safety feature that makes three actions necessary to engage the starter = and start the engine and unlikely all three would accidently be turned = on. Key switch on - enables starter button Toggle Swith on - power to EC2 and starter contactor Starter Button that causes starter contactor to close and provide power = to the starter. =20 > I have a small terminal strip on the cold side of the firewall = that > gets it's power straight from the ignition switch, so I could easily = swap > the "constantly hot" wire that goes from the positive side of my = battery to > the injectors, disconnect it and attach it to the "ignition on" power = strip > so that the injectors only get power with the ignition switch in the = ON > position. > Not sure if this really matters....I wasn't so sure it would be = good > to have constant power going to the injectors from the battery. = However, > that's how the heavy starter wire is....Direct power to the starter = from the > positive side of the battery. If you put your injector power line on your ignition switch you have = probably more than doubled the current running through it, so make = certain the switch can handle it - I personally would not do it. Not = trusting any single switch (and I purchased the best I could find) all = of my critical systems have a power line to them that goes through a 30 = amp circuit breaker than is normally open - should a critical switch = fail, I can push in the CB bypassing those switches and insure continued = power to my critical circuits - I call it my "Live Man Switch" {:>). Did = I mention I was a bit Anal about redundancy?? > I sure would appreciate any and all opinions on this. It does = run OK > as is....I'm just wondering if there are any safety concerns, etc = about > leaving power to one side of the injectors even when the plane is not = being > used. I would think not. You have a fuse (I would have a CB but that's just = my personal bias) that should any injector wiring short to ground, it = should blow and prevent any further damage. Just consider the injectors = as coils of wire (which they are electrically) and then they are no = different that any other wire you might have power to continuously. > Thanks for everyone's attempt in clearing this up for me. Paul > Conner, 13b powered SQ2000 in Mobile, AL >=20 Paul, there is one consideration that has occurred to me. How is the = Micro Tech EFI circuit triggered? When I used the HALTECH, you had to = have a trigger signal from the ignition system. I initially had mine = triggered off of my leading ignition coil. One day my engine died = (fortunately on the ground) and I found that the leading coil had died. = That puzzled me at first as I had the trailing coil which should have = kept things running, until I realized that when the leading coil died so = did my EFI trigger!!!! So no fuel was being injected! After that I rigged a switch so I could get a EFI triggering signal off = either coil. Tracy's EC2 uses the crank angle sensor which is about as = reliable as a spinning hunk of magnet and a stational pick up coil can = be and of course either of his Controllers will continue to trigger both = ignition units. Thats about all I can think of. Ed Anerson >=20 > >> Homepage: http://www.flyrotary.com/ > >> Archive: http://lancaironline.net/lists/flyrotary/List.html > ------=_NextPart_000_0004_01C42D76.4259AAA0 Content-Type: text/html; charset="Windows-1252" Content-Transfer-Encoding: quoted-printable
I'll take a stab at = your questions,=20 Paul.
Ed Anderson
RV-6A = N494BW Rotary=20 Powered
Matthews, NC
----- Original Message -----
From: "sqpilot@earthlink" = <sqpilot@earthlink.net>
To: "Rotary motors in aircraft" = <flyrotary@lancaironline.net>
Sent: Wednesday, April 28, 2004 10:25=20 PM
Subject: [FlyRotary] ECU = wiring

> Hi, fellow rotary = enthusiasts.  My 13b is=20 running pretty well with my Micro
> Tech ECU.  I keep = thinking that=20 even though it's running OK, I might have
> something wired = incorrectly,=20 or that could be improved upon. I know that
> most of you are = using=20 Tracy's ECU, but since they both accomplish the same
> task, I = thought I=20 could ask a couple of questions to compare my system to
> = Tracy's.
>=20       The wiring schematic shows a red wire = going from=20 the positive side of
> the battery, through a 30 amp fuse, and to = one side=20 of the injectors. That
> would put power to the injectors at all = times,=20 even if the ignition switch
> is in the OFF position.  I = understand=20 that the injectors, however will not
> fire until the ECU sends a = ground=20 signal to the other wire on the injector.
> Is this common = practice? =20 Does Tracy's system work in a similar manner?
 
The two fuel injection = systems I have=20 employed (HALTECH and Tracy's EC2) both have power directly to the=20 inejctors.  The injectors should not activate or consume any power = unless=20 the ECU is operating - that is grounding one of the leads to each=20 injector.  I do have a 30 amp circuit breaker in my injector power=20 line
I personally would not = want that line=20 going through my ignition switch.  There is pulsating voltage on = that line=20 when the injectors are firing and running that wire around under your = instrument=20 panel could increase the chances for electronic interference.  Too = many=20 circuits tied to the ignition switch is something I would also=20 avoid.
 

>       = The=20 schematic shows the red wires that go to the 4 Bosch coils goes
> = through=20 the ignition switch first. That made sense to me.
 
That sounds reasonable = to me as=20 well.   Although in my case, the  power to my = Mazda=20 coils also goes through a CB and not through the ignition switch. = Basically, my=20 ignition switch does one thing , it enables the starter button.  My = power=20 to my Ec2 is controlled by a toggle switch which also provides = power to my=20 starter contactor - so both my keyed ignition switch (actually = starter=20 enable switch) and my EC2 toggle must be on for the engine to be started = by=20 pushing a starter button.  A safety feature that makes three = actions=20 necessary to engage the starter and start the engine and unlikely all = three=20 would accidently be turned on.
 
Key switch on - = enables starter=20 button
Toggle Swith on - power = to EC2 and=20 starter contactor
Starter Button that=20 causes starter contactor to close and provide power to the=20 starter.
 
 

>      I have a small terminal strip on = the cold=20 side of the firewall that
> gets it's power straight from the = ignition=20 switch, so I could easily swap
> the "constantly hot" wire that = goes from=20 the positive side of my battery to
> the injectors, disconnect it = and=20 attach it to the "ignition on" power strip
> so that the injectors = only=20 get power with the ignition switch in the ON
> position.
>=20       Not sure if this really matters....I = wasn't so=20 sure it would be good
> to have constant power going to the = injectors from=20 the battery.  However,
> that's how the heavy starter wire=20 is....Direct power to the starter from the
> positive side of the=20 battery.
 
If you put your = injector power line=20 on your ignition switch you have probably more than doubled the current = running=20 through it, so make certain the switch can handle it - I personally = would not do=20 it.  Not trusting any single switch (and I purchased the best I = could find)=20 all of my critical systems have a power line to them that goes through a = 30 amp=20 circuit breaker than is normally open - should a critical switch fail, I = can=20 push in the CB bypassing those switches and insure continued power to my = critical circuits - I call it my "Live Man Switch" {:>). Did I = mention I was=20 a bit Anal about redundancy??
 

>       = I sure=20 would appreciate any and all opinions on this.  It does run = OK
> as=20 is....I'm just wondering if there are any safety concerns, etc = about
>=20 leaving power to one side of the injectors even when the plane is not=20 being
> used.
I would think = not.  You have a=20 fuse (I would have a CB but that's just my personal bias) that should = any=20 injector wiring short to ground, it should blow and prevent any further=20 damage.  Just consider the injectors as coils of wire (which they = are=20 electrically) and then they are no different that any other wire you = might have=20 power to continuously.
 

>=20       Thanks for everyone's attempt in clearing = this up=20 for me.  Paul
> Conner, 13b powered SQ2000 in Mobile, = AL
>=20
Paul, there is one consideration that has = occurred to=20 me.  How is the Micro Tech EFI circuit triggered?  When I used = the=20 HALTECH, you had to have a trigger signal from the ignition = system.  I=20 initially had mine triggered off of my leading ignition coil.  One = day my=20 engine died (fortunately on the ground)  and I found that the = leading coil=20 had died.  That puzzled me at first as I had the trailing coil = which should=20 have kept things running, until I realized that when the leading coil = died so=20 did my EFI trigger!!!! So no fuel was being = injected!
 
After that I rigged a = switch so I=20 could get a EFI triggering signal off either coil.  Tracy's EC2 = uses the=20 crank angle sensor which is about as reliable as a spinning hunk of = magnet and a=20 stational pick up coil can be and of course either of his Controllers = will=20 continue to trigger both ignition units.
 
Thats about all I can = think=20 of.
 
Ed Anerson
 
 

>
> >>  Homepage:  http://www.flyrotary.com/
>=20 >>  Archive:   http://lancaironline.net/lists/flyrotary/List.html>
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