X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from imf16aec.mail.bellsouth.net ([205.152.59.64] verified) by logan.com (CommuniGate Pro SMTP 4.3c5) with ESMTP id 948616 for flyrotary@lancaironline.net; Wed, 18 May 2005 10:02:58 -0400 Received-SPF: pass receiver=logan.com; client-ip=205.152.59.64; envelope-from=sladerj@bellsouth.net Received: from ibm58aec.bellsouth.net ([65.8.218.8]) by imf16aec.mail.bellsouth.net (InterMail vM.5.01.06.11 201-253-122-130-111-20040605) with ESMTP id <20050518140212.OYTP2012.imf16aec.mail.bellsouth.net@ibm58aec.bellsouth.net> for ; Wed, 18 May 2005 10:02:12 -0400 Received: from JSLADE ([65.8.218.8]) by ibm58aec.bellsouth.net (InterMail vG.1.02.00.01 201-2136-104-101-20040929) with ESMTP id <20050518140212.KKXG25991.ibm58aec.bellsouth.net@JSLADE> for ; Wed, 18 May 2005 10:02:12 -0400 From: "John Slade" To: "Rotary motors in aircraft" Subject: RE: [FlyRotary] Re: EC2 Problem suggestion Date: Wed, 18 May 2005 10:02:10 -0400 Message-ID: MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_071C_01C55B90.A8477240" X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook IMO, Build 9.0.2416 (9.0.2910.0) In-Reply-To: X-MIMEOLE: Produced By Microsoft MimeOLE V6.00.2800.1409 Importance: Normal This is a multi-part message in MIME format. ------=_NextPart_000_071C_01C55B90.A8477240 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit All it takes is a single (missed) strand of the shield (connected to the core) to create a short. remove the connector(s) from the EC2 and check with an ohm meter between each pin on the connector and to ground (for pins that don't go to ground) for shorts (0 ohms). Thanks Finn. I checked that as I went, and again (twice) after everything was buttoned up. realized that you used shield wires, did you shield all wires? Don't know what type of wire you used, maybe you mentioned it somewhere. Shielded wire can have a lot of capacitance I used shielded 22g aircraft wire for all EC2 inputs to the PCM (program control module) and EM2. The shield for each is grounded at the EC2 end only. Resistance measures around 0.3 ohms on each wire. The EC2 manual calls for shielding on injector and CAS wires only. Tracy suggested I shield all wires to eliminate noise. I could try disconnecting the shields if you think it might help - but doesn't that put me back in the "noise" regime? Might be a good idea. Right now a little "noise" would be kinda refreshing. :( John ------=_NextPart_000_071C_01C55B90.A8477240 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

All it takes is a single (missed) strand of the shield (connected = to the=20 core) to create a short.

remove the = connector(s) from the EC2=20 and check with an ohm meter between each pin on the connector and to = ground (for=20 pins that don't go to ground) for shorts (0 ohms).
Thanks = Finn. I=20 checked that as I went, and again (twice) after everything was buttoned=20 up.

realized that you used shield wires, did you = shield all=20 wires? Don't know what type of wire you used, maybe you mentioned = it=20 somewhere. Shielded wire can have a lot of = capacitance

I used = shielded 22g=20 aircraft wire for all EC2 inputs to the PCM (program control = module) and=20 EM2. The shield for each is grounded at the EC2 end = only. Resistance=20 measures around 0.3 ohms on each wire. = The EC2 manual calls for shielding on injector and CAS = wires only.=20 Tracy suggested I shield all wires to eliminate noise. I could try = disconnecting=20 the shields if you think it might help - but doesn't that put me back in = the=20 "noise" regime? Might be a good idea. Right now a little "noise" would = be kinda=20 refreshing. :(

John

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