Return-Path: Sender: "Marvin Kaye" To: lml@lancaironline.net Date: Wed, 26 Jan 2005 10:38:51 -0500 Message-ID: X-Original-Return-Path: Received: from [65.32.5.131] (HELO ms-smtp-01.tampabay.rr.com) by logan.com (CommuniGate Pro SMTP 4.2.8) with ESMTP id 622992 for lml@lancaironline.net; Wed, 26 Jan 2005 10:33:16 -0500 Received-SPF: none receiver=logan.com; client-ip=65.32.5.131; envelope-from=ckohler1@cfl.rr.com Received: from 34025820001 (152.227.204.68.cfl.rr.com [68.204.227.152]) by ms-smtp-01.tampabay.rr.com (8.12.10/8.12.7) with SMTP id j0QFWhNj006392 for ; Wed, 26 Jan 2005 10:32:44 -0500 (EST) X-Original-Message-ID: <008101c503bc$64b0a3c0$6401a8c0@34025820001> From: "Charlie Kohler" X-Original-To: "Lancair Mailing List" References: Subject: Re: [LML] Re: Plugs and Mags X-Original-Date: Wed, 26 Jan 2005 10:33:32 -0500 MIME-Version: 1.0 Content-Type: text/plain; format=flowed; charset="iso-8859-1"; reply-type=response Content-Transfer-Encoding: 7bit X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2900.2180 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.2180 X-Virus-Scanned: Symantec AntiVirus Scan Engine I have discovered that the life of the iridium plug seems to be dependent upon the porcelain. I had several (three to be exact) when over 500 hours, that I would discover a mag drop that traced to a individual plug which had a cracked insulator. No other indications anywhere of detonation/mechanical/dropped plugs during its history. Can it be that the porcelain becomes more brittle or soft or??? Any ideas?? I have replaced the iridium's several times now. By the way, never do the new plugs show up a cracked insulator. During their 500 hours the gap never changed and only rarely would I have to take bromide deposits out of the bottom of plug. Thanks to running LOP. FWIW Charlie K.