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 4084943 for flyrotary@lancaironline.net; Sat, 16 Jan 2010 10:36:52 -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 20100116153616157 for ; Sat, 16 Jan 2010 10:36:16 -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 CDV63396; Sat, 16 Jan 2010 10:36:15 -0500 (EST) Message-ID: <00f901ca96c1$c6249060$6405a8c0@home01> From: "Joe Ewen" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] Re: Alternator Filter Date: Sat, 16 Jan 2010 10:37:12 -0500 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_00F6_01CA9697.DD3B7590" 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_00F6_01CA9697.DD3B7590 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Been there don that. Thaks for the input. Joe ----- Original Message -----=20 From: Jeff Whaley=20 To: Rotary motors in aircraft=20 Sent: Saturday, January 16, 2010 9:58 AM Subject: [FlyRotary] Re: Alternator Filter Hey Joe, if the capacitor becomes resistive and they can, you will = have a dc connection to ground. Measure the filter (if you haven't already) to ensure it is 100% = open-circuit. Jeff -------------------------------------------------------------------------= ----- From: Rotary motors in aircraft [flyrotary@lancaironline.net] On = Behalf Of Joe Ewen [jewen@comporium.net] Sent: Friday, January 15, 2010 6:12 PM To: Rotary motors in aircraft Subject: [FlyRotary] Alternator Filter 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 This message, and the documents attached hereto, is intended only for = the addressee and may contain privileged or confidential information. = Any unauthorized disclosure is strictly prohibited. If you have received = this message in error, please notify us immediately so that we may = correct our internal records. Please then delete the original message. = Thank you. ------=_NextPart_000_00F6_01CA9697.DD3B7590 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
Been there don that.  Thaks for = the=20 input.
 
Joe
----- Original Message -----
From:=20 Jeff=20 Whaley
Sent: Saturday, January 16, = 2010 9:58=20 AM
Subject: [FlyRotary] Re: = Alternator=20 Filter

Hey Joe, = if the capacitor=20 becomes resistive and they can, you will have a dc connection to=20 ground.
Measure = the filter=20 (if you haven't already) to ensure it is 100% = open-circuit.
Jeff
From: Rotary motors in aircraft=20 [flyrotary@lancaironline.net] On Behalf Of Joe Ewen=20 [jewen@comporium.net]
Sent: Friday, January 15, 2010 6:12=20 PM
To: Rotary motors in aircraft
Subject: = [FlyRotary]=20 Alternator Filter

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=20 saw some spikes.  Bought an aircraft spruce alternator = filter.  Ran=20 the engine , worked fine until it would not prime or run any = more.  That=20 turned out to be a defective store switch.  Replaced the switch = and back=20 to 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=20 on (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=20 speak up.
 
I have 2 wiring ducts: 1. quiet - = signals such as=20 to the PCM, ignition firing leads, low voltage sensor, analog = signals. =20 2. Noisy side, battery cables, ignition power, injector power and = signal=20 (twisted 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=20 battery (outside the airframe, long wire - engine in back, battery in = front=20 (canard)) everything runs fine.) Aesthetically this might not be = a good=20 approach, not 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,=20 especially why a capacitor (which does not conduct DC) would render = the EC2=20 controller inoperative would be appreciated.
 
Thanks,
Joe
 

This message, and the documents = attached hereto,=20 is intended only for the addressee and may contain privileged or = confidential=20 information. Any unauthorized disclosure is strictly prohibited. If = you have=20 received this message in error, please notify us immediately so that = we may=20 correct our internal records. Please then delete the original message. = Thank=20 you.
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