X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from rc1-smtp.comporium.net ([208.104.2.18] verified) by logan.com (CommuniGate Pro SMTP 5.3.1) with ESMTP id 4084387 for flyrotary@lancaironline.net; Fri, 15 Jan 2010 18:12:29 -0500 Received-SPF: pass receiver=logan.com; client-ip=208.104.2.18; envelope-from=jewen@comporium.net Received: from rg4.comporium.net ([208.104.2.24]) by rc1-smtp.comporium.net ({6ef86d1c-fcb7-4b71-ab61-5707d6041926}) via TCP (outbound) with ESMTP id 20100115231153192 for ; Fri, 15 Jan 2010 18:11:53 -0500 X-RC-FROM: X-RC-RCPT: Received: from 67-197-214-136.ln.dyn.cm.comporium.net (HELO home01) ([67.197.214.136]) by rg4.comporium.net (MOS 3.10.7-GA FastPath queued) with SMTP id CDV05800; Fri, 15 Jan 2010 18:11:52 -0500 (EST) Message-ID: <000801ca9638$40c30ca0$6405a8c0@home01> From: "Joe Ewen" To: "Rotary motors in aircraft" Subject: Alternator Filter Date: Fri, 15 Jan 2010 18:12:48 -0500 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0005_01CA960E.57CE0AF0" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2800.1933 X-MIMEOLE: Produced By Microsoft MimeOLE V6.00.2800.1933 This is a multi-part message in MIME format. ------=_NextPart_000_0005_01CA960E.57CE0AF0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable I have been having problems with my engine installation. Starts, runs = great - turn on the alternator and the engine starts to miss. Put a = scope on R1 ignition trigger lead and sure enough missing trigger = pulses. Turn alternator off no more missing pulses. Looked at the = alternator output with the scope and as expected saw some spikes. = Bought an aircraft spruce alternator filter. Ran the engine , worked = fine until it would not prime or run any more. That turned out to be a = defective store switch. Replaced the switch and back to normal. Here = is the part I do not yet understand. Engine runs fine, added alternator filter and can not even get a pop. = Take the filter off, starts fine. Filter back on (alt off), no joy. = Filter on (alt on), no joy. Filter off, runs fine. I can not imagine = how a filter capacitor is interfering with the ignition of the = controller. If anyone has any insight please feel to speak up. I have 2 wiring ducts: 1. quiet - signals such as to the PCM, ignition = firing leads, low voltage sensor, analog signals. 2. Noisy side, = battery cables, ignition power, injector power and signal (twisted pair = shielded (shield properly grounded.) Alternator connects to battery cable at the starter. If I run an = external wire between the alternator and the battery (outside the = airframe, long wire - engine in back, battery in front (canard)) = everything runs fine.) Aesthetically this might not be a good approach, = not to mention the aerodynamic impact. This problem has kicked my butt this week working on it in the cool 20F = evening air. Any insight is appreciated, especially why a capacitor = (which does not conduct DC) would render the EC2 controller inoperative = would be appreciated. Thanks, Joe ------=_NextPart_000_0005_01CA960E.57CE0AF0 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable

I have been having problems with my = engine=20 installation. Starts, runs great - turn on the alternator and the = engine=20 starts to miss. Put a scope on R1 ignition trigger lead and sure = enough=20 missing trigger pulses. Turn alternator off no more missing=20 pulses. Looked at the alternator output with the scope and as = expected saw=20 some spikes. Bought an aircraft spruce alternator filter. = Ran the=20 engine , worked fine until it would not prime or run any more. = That turned=20 out to be a defective store switch. Replaced the switch and back = to=20 normal. Here is the part I do not yet understand.

Engine runs fine, added alternator = filter and can=20 not even get a pop. Take the filter off, starts fine. Filter = back on=20 (alt off), no joy. Filter on (alt on), no joy. Filter off, = runs=20 fine. I can not imagine how a filter capacitor is interfering with = the=20 ignition of the controller. If anyone has any insight please feel = to speak=20 up.

I have 2 wiring ducts: 1. quiet - = signals such as=20 to the PCM, ignition firing leads, low voltage sensor, analog = signals. 2.=20 Noisy side, battery cables, ignition power, injector power and signal = (twisted=20 pair shielded (shield properly grounded.)

Alternator connects to battery cable at = the=20 starter. If I run an external wire between the alternator and the = battery=20 (outside the airframe, long wire - engine in back, battery in front = (canard))=20 everything runs fine.) Aesthetically this might not be a good = approach, not=20 to mention the aerodynamic impact.

This problem has kicked my butt this = week working=20 on it in the cool 20F evening air. Any insight is appreciated, = especially=20 why a capacitor (which does not conduct DC) would render the EC2 = controller=20 inoperative would be appreciated.

Thanks,

Joe

------=_NextPart_000_0005_01CA960E.57CE0AF0--