X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from EXHUB003-2.exch003intermedia.net ([207.5.74.29] verified) by logan.com (CommuniGate Pro SMTP 5.3.1) with ESMTPS id 4084911 for flyrotary@lancaironline.net; Sat, 16 Jan 2010 10:03:54 -0500 Received-SPF: none receiver=logan.com; client-ip=207.5.74.29; envelope-from=jwhaley@datacast.com Received: from EXVMBX003-5.exch003intermedia.net ([207.5.74.45]) by EXHUB003-2.exch003intermedia.net ([207.5.74.29]) with mapi; Sat, 16 Jan 2010 07:03:17 -0800 From: Jeff Whaley To: Rotary motors in aircraft Date: Sat, 16 Jan 2010 06:58:24 -0800 Subject: RE: [FlyRotary] Alternator Filter Thread-Topic: [FlyRotary] Alternator Filter Thread-Index: AcqWOD3Mm0CoT/uaTKia/SXcYij7bgAhBwgE Message-ID: References: In-Reply-To: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: acceptlanguage: en-US Content-Type: multipart/alternative; boundary="_000_C03ABB0A7362B84BB53D544B3C305E0E01669B31FED2EXVMBX0035e_" MIME-Version: 1.0 --_000_C03ABB0A7362B84BB53D544B3C305E0E01669B31FED2EXVMBX0035e_ Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Hey Joe, if the capacitor becomes resistive and they can, you will have a d= c connection to ground. Measure the filter (if you haven't already) to ensure it is 100% open-circu= it. 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 grea= t - turn on the alternator and the engine starts to miss. Put a scope on R= 1 ignition trigger lead and sure enough missing trigger pulses. Turn alte= rnator off no more missing pulses. Looked at the alternator output with th= e scope and as expected saw some spikes. Bought an aircraft spruce alterna= tor filter. Ran the engine , worked fine until it would not prime or run a= ny more. That turned out to be a defective store switch. Replaced the swi= tch 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 c= apacitor 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 firi= ng leads, low voltage sensor, analog signals. 2. Noisy side, battery cable= s, 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 wir= e - engine in back, battery in front (canard)) everything runs fine.) Aesth= etically 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 eve= ning air. Any insight is appreciated, especially why a capacitor (which do= es not conduct DC) would render the EC2 controller inoperative would be app= reciated. Thanks, Joe This message, and the documents attached hereto, is intended only for the a= ddressee and may contain privileged or confidential information. Any unauth= orized 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. --_000_C03ABB0A7362B84BB53D544B3C305E0E01669B31FED2EXVMBX0035e_ Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
Hey Joe= , if the capacitor becomes resistive and they can, you will have a dc conne= ction to ground.
Measure= the filter (if you haven't already) to ensure it is 100% open-circuit= .
Jeff
From: Rotary motors in aircraft [fl= yrotary@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 en= gine installation.  Starts, runs great - turn on the alternator and th= e 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 alt= ernator 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 fil= ter and can not even get a pop.  Take the filter off, starts fine.&nbs= p; 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 any= one has any insight please feel to speak up.
 
I have 2 wiring ducts: 1. quiet - sign= als such as to the PCM, ignition firing leads, low voltage sensor, analog s= ignals.  2. Noisy side, battery cables, ignition power, injector power= and signal (twisted pair shielded (shield properly grounded.)
 
Alternator connects to battery cable a= t the starter.  If I run an external wire between the alternator and t= he battery (outside the airframe, long wire - engine in back, battery in fr= ont (canard)) everything runs fine.) Aesthetically this might not be a good approach, not to mention the aerodynamic impact.<= /font>
 
This problem has kicked my butt this w= eek working on it in the cool 20F evening air.  Any insight is appreci= ated, especially why a capacitor (which does not conduct DC) would render t= he EC2 controller inoperative would be appreciated.
 
Thanks,
Joe
 

This message, and the docum= ents attached hereto, is intended only for the addressee and may contain pr= ivileged or confidential information. Any unauthorized disclosure is strict= ly 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.
 --_000_C03ABB0A7362B84BB53D544B3C305E0E01669B31FED2EXVMBX0035e_--