X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Wed, 21 May 2008 20:48:50 -0400 Message-ID: X-Original-Return-Path: Received: from mta13.adelphia.net ([68.168.78.44] verified) by logan.com (CommuniGate Pro SMTP 5.2.3) with ESMTP id 2931840 for lml@lancaironline.net; Wed, 21 May 2008 08:46:21 -0400 Received-SPF: pass receiver=logan.com; client-ip=68.168.78.44; envelope-from=glcasey@adelphia.net Received: from [76.166.22.191] by mta13.adelphia.net (InterMail vM.6.01.05.02 201-2131-123-102-20050715) with ESMTP id <20080521124435.DGQR21875.mta13.adelphia.net@[76.166.22.191]> for ; Wed, 21 May 2008 08:44:35 -0400 Mime-Version: 1.0 (Apple Message framework v753) In-Reply-To: References: Content-Type: multipart/alternative; boundary=Apple-Mail-13--1008979098 X-Original-Message-Id: From: Gary Casey Subject: Re: Electronic ignition spark plugs X-Original-Date: Wed, 21 May 2008 05:45:38 -0700 X-Original-To: "Lancair Mailing List" X-Mailer: Apple Mail (2.753) --Apple-Mail-13--1008979098 Content-Transfer-Encoding: 7bit Content-Type: text/plain; charset=US-ASCII; delsp=yes; format=flowed In my opinion, there is no advantage to using rare-earth-electrode plugs. The typical methodology is to change the electronic-ignition plugs every annual or 100 hours, where aircraft-type plugs are generally never changed, except on condition. There are two reasons for this - the automotive plugs used in the(most, anyway) electronic systems are cheap and they have less clearance between the insulator and housing and therefore are more prone to suffer from lead fouling. The reason aircraft plugs are so large is to have a large enough gap to allow lead buildup, and to allow easy cleaning. If you are going to throw the plugs away after 100 hours of use the extra durability of the iridium plugs won't buy you anything. I would not spend the money. Gary Casey > Is there any advantage in using Iridium plugs in the electronic > ignition system? > > Annual next week and plan to change plugs. > > Cheers > > Dom --Apple-Mail-13--1008979098 Content-Transfer-Encoding: quoted-printable Content-Type: text/html; charset=ISO-8859-1 In my opinion, there is no advantage to using rare-earth-electrode = plugs. =A0The typical methodology is to change the electronic-ignition = plugs every annual or 100 hours, where aircraft-type plugs are generally = never changed, except on condition. =A0There are two reasons for this - = the automotive plugs used in the(most, anyway) electronic systems are = cheap and they have less clearance between the insulator and housing and = therefore are more prone to suffer from lead fouling. =A0The reason = aircraft plugs are so large is to have a large enough gap to allow lead = buildup, and to allow easy cleaning. =A0If you are going to throw the = plugs away after 100 hours of use the extra durability of the iridium = plugs won't buy you anything. =A0I would not spend the = money.

Gary Casey

Is there any = advantage in using Iridium plugs in the electronic ignition = system?

Annual next week and plan to change = plugs.

Cheers

Dom

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