X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from fed1rmmtao05.cox.net ([68.230.241.34] verified) by logan.com (CommuniGate Pro SMTP 5.0.6) with ESMTP id 931705 for flyrotary@lancaironline.net; Wed, 18 Jan 2006 14:38:48 -0500 Received-SPF: none receiver=logan.com; client-ip=68.230.241.34; envelope-from=ALVentures@cox.net Received: from BigAl ([68.7.14.39]) by fed1rmmtao05.cox.net (InterMail vM.6.01.05.02 201-2131-123-102-20050715) with ESMTP id <20060118193555.HFQK17838.fed1rmmtao05.cox.net@BigAl> for ; Wed, 18 Jan 2006 14:35:55 -0500 From: "Al Gietzen" To: "'Rotary motors in aircraft'" Subject: RE: [FlyRotary] Re: LS1 Coil Failures Date: Wed, 18 Jan 2006 11:38:10 -0800 Message-ID: <001001c61c66$b72c8d30$6400a8c0@BigAl> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0011_01C61C23.A9094D30" X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook, Build 10.0.6626 Importance: Normal X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.2180 In-Reply-To: This is a multi-part message in MIME format. ------=_NextPart_000_0011_01C61C23.A9094D30 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable =20 Mark, 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 =20 Ah-h-h; and why would duty cycle not have an effect on temperature and failure rate of the 'trigger' circuit? The solid state components do dissipate some heat, and the more cycles, the more heat and other = effects leading to failure.=20 =20 Al G ------=_NextPart_000_0011_01C61C23.A9094D30 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

 

 Mark,<= /p>

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

 

Ah-h-h; and why would duty cycle = not have an effect on temperature and failure rate of the = ‘trigger’ circuit?  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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