X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from imf23aec.mail.bellsouth.net ([205.152.59.71] verified) by logan.com (CommuniGate Pro SMTP 5.0.6) with ESMTP id 932115 for flyrotary@lancaironline.net; Wed, 18 Jan 2006 18:24:21 -0500 Received-SPF: pass receiver=logan.com; client-ip=205.152.59.71; envelope-from=atlasyts@bellsouth.net Received: from ibm70aec.bellsouth.net ([65.8.117.159]) by imf24aec.mail.bellsouth.net with ESMTP id <20060118224947.ZOOK23820.imf24aec.mail.bellsouth.net@ibm70aec.bellsouth.net> for ; Wed, 18 Jan 2006 17:49:47 -0500 Received: from [192.168.0.100] (really [65.8.117.159]) by ibm70aec.bellsouth.net with ESMTP id <20060118224946.ICCY26589.ibm70aec.bellsouth.net@[192.168.0.100]> for ; Wed, 18 Jan 2006 17:49:46 -0500 Mime-Version: 1.0 (Apple Message framework v746.2) In-Reply-To: References: Content-Type: multipart/alternative; boundary=Apple-Mail-1-403613275 Message-Id: <605741A8-86F1-437E-8065-4DD73C9842CE@bellsouth.net> From: Bulent Aliev Subject: Re: [FlyRotary] Re: LS1 Coil Failures Date: Wed, 18 Jan 2006 17:50:03 -0500 To: "Rotary motors in aircraft" X-Mailer: Apple Mail (2.746.2) --Apple-Mail-1-403613275 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=WINDOWS-1252; delsp=yes; format=flowed Tracy has already a collection of 3 failed coils. How about an =20 autopsy? That may give us a better idea? Bulent "Buly" Aliev http://tinyurl.com/dcy36 On Jan 18, 2006, at 2:38 PM, Al Gietzen wrote: > > Mark, > > There may well be a duty cycle problem, but I doubt it. Older =20 > ignitions used a single coil of similar type firing all 8 =20 > cylinders. I would be more likely to suggest it was a "bathtub =20 > failure curve" failure of the solid state "trigger" circuit. > > Bill Jepson > > > Ah-h-h; and why would duty cycle not have an effect on temperature =20 > and failure rate of the =91trigger=92 circuit? The solid state =20 > components do dissipate some heat, and the more cycles, the more =20 > heat and other effects leading to failure. > > > Al G > > --Apple-Mail-1-403613275 Content-Transfer-Encoding: quoted-printable Content-Type: text/html; charset=WINDOWS-1252 Tracy has already a collection = of 3 failed coils. How about an autopsy? That may give us a better = idea?
Bulent "Buly" = Aliev

 =

On Jan 18, 2006, at 2:38 PM, Al Gietzen = wrote:

=A0

=A0Mark,

There may well be a duty cycle problem, but I = doubt it. Older ignitions used a single coil of similar type firing all = 8 cylinders. I would be more likely to suggest it was a "bathtub failure = curve" failure of the solid state "trigger" = circuit.

Bill Jepson

=A0

Ah-h-h; and why = would duty cycle not have an effect on temperature and failure rate of = the =91trigger=92 circuit?=A0 The solid state components do dissipate = some heat, and the more cycles, the more heat and other effects leading = to failure.

Al G



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