Return-Path: Received: from [65.54.169.160] (HELO hotmail.com) by logan.com (CommuniGate Pro SMTP 4.2b2) with ESMTP id 3196449 for flyrotary@lancaironline.net; Wed, 28 Apr 2004 23:02:56 -0400 Received: from mail pickup service by hotmail.com with Microsoft SMTPSVC; Wed, 28 Apr 2004 20:02:56 -0700 Received: from 4.174.1.39 by BAY3-DAV130.phx.gbl with DAV; Thu, 29 Apr 2004 03:02:56 +0000 X-Originating-IP: [4.174.1.39] X-Originating-Email: [lors01@msn.com] X-Sender: lors01@msn.com From: "Tracy Crook" To: "Rotary motors in aircraft" Subject: Re: [FlyRotary] ECU wiring Date: Wed, 28 Apr 2004 23:02:54 -0400 MIME-Version: 1.0 X-Mailer: MSN Explorer 7.02.0011.2700 Content-Type: multipart/alternative; boundary="----=_NextPart_001_0001_01C42D74.F093F0A0" Message-ID: X-OriginalArrivalTime: 29 Apr 2004 03:02:56.0728 (UTC) FILETIME=[78BE0580:01C42D96] ------=_NextPart_001_0001_01C42D74.F093F0A0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable That is normal automotive practice Paul. The EC2 must not be wired that= way due to the spike clamping diodes on it which recover the inductive e= nergy in the injectors at cutoff time (to reduce power consumption). It = also has the effect of powering the EC2 through the injectors if the powe= r is left on the injectors. Tracy (recovering from panic mode after getting website back on the air) ----- Original Message ----- From: sqpilot@earthlink Sent: Wednesday, April 28, 2004 10:25 PM To: Rotary motors in aircraft Subject: [FlyRotary] ECU wiring Hi, fellow rotary enthusiasts. My 13b is running pretty well with my Mic= ro 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 sam= e 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. Tha= t would put power to the injectors at all times, even if the ignition switc= h is in the OFF position. I understand that the injectors, however will no= t fire until the ECU sends a ground signal to the other wire on the injecto= r. Is this common practice? Does Tracy's system work in a similar manner? The schematic shows the red wires that go to the 4 Bosch coils goes through the ignition switch first. That made sense to me. 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 str= ip 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 goo= d 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. 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 bei= ng used. Thanks for everyone's attempt in clearing this up for me. Paul Conner, 13b powered SQ2000 in Mobile, AL >> Homepage: http://www.flyrotary.com/ >> Archive: http://lancaironline.net/lists/flyrotary/List.html ------=_NextPart_001_0001_01C42D74.F093F0A0 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable

That is normal= automotive practice Paul. The EC2 must not be wired that way= due to the spike clamping diodes on it which recover the inductive energ= y in the injectors at cutoff time (to reduce power consumption). It= also has the effect of powering the EC2 through the injectors if the pow= er is left on the injectors.

Tracy (re= covering from panic mode after getting website back on the air)

<= DIV style=3D"FONT: 10pt Arial">----- Original Message -----
From: = sqpilot@earthlink

Sent: Wedn= esday, April 28, 2004 10:25 PM

T= o: Rotary motors in aircraft

Subject: [FlyRotary] ECU wiring

Hi, fellow ro= tary enthusiasts. My 13b is running pretty well with my Micro
Te= ch ECU. I keep thinking that even though it's running OK, I might h= ave
something wired incorrectly, or that could be improved upon. I kno= w that
most of you are using Tracy's ECU, but since they both accompli= sh the same
task, I thought I could ask a couple of questions to compa= re 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
i= s in the OFF position. I understand that the injectors, however wil= l not
fire until the ECU sends a ground signal to the other wire on th= e injector.
Is this common practice? Does Tracy's system work in= a similar manner?
      The schematic shows = the red wires that go to the 4 Bosch coils goes
through the ignition s= witch first. That made sense to me.
     I have a = small terminal strip on the cold side of the firewall that
gets it's p= ower straight from the ignition switch, so I could easily swap
the "co= nstantly hot" wire that goes from the positive side of my battery to
t= he injectors, disconnect it and attach it to the "ignition on" power stri= p
so that the injectors only get power with the ignition switch in the= ON
position.
      Not sure if this reall= y 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
positiv= e side of the battery.
      I sure would app= reciate 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 p= ower to one side of the injectors even when the plane is not being
use= d.
      Thanks for everyone's attempt in cle= aring this up for me. Paul
Conner, 13b powered SQ2000 in Mobile,= AL

>> Homepage: http://www.flyrotary.co= m/
>> Archive:   http://lancaironline.net/lists/= flyrotary/List.html

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