X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Fri, 30 May 2008 09:44:46 -0400 Message-ID: X-Original-Return-Path: Received: from sfa.gami.com ([68.89.254.162] verified) by logan.com (CommuniGate Pro SMTP 5.2.3) with ESMTP id 2944879 for lml@lancaironline.net; Thu, 29 May 2008 20:07:38 -0400 Received-SPF: none receiver=logan.com; client-ip=68.89.254.162; envelope-from=gwbraly@gami.com Received: from localhost (localhost.localdomain [127.0.0.1]) by sfa.gami.com (Postfix) with ESMTP id 40BFC29C087; Thu, 29 May 2008 19:06:58 -0500 (CDT) Received: from gamimail1.Gami.local (unknown [10.10.10.33]) by sfa.gami.com (Postfix) with ESMTP id D986629C084; Thu, 29 May 2008 19:06:57 -0500 (CDT) Received: from gamimail1.Gami.local ([10.10.10.33]) by gamimail1.Gami.local ([10.10.10.33]) with mapi; Thu, 29 May 2008 19:06:55 -0500 From: George Braly X-Original-To: Lancair Mailing List X-Original-CC: Timothy Roehl , Walter Atkinson , "jdeakin@advancedpilot.com" X-Original-Date: Thu, 29 May 2008 19:06:53 -0500 Subject: RE: [LML] Re: Electronic ignition spark plugs Thread-Topic: [LML] Re: Electronic ignition spark plugs Thread-Index: AcjBNN6O31uMn6fyT4qJ8O186tUSGQAsv00A X-Original-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_C273A1B35F3C6748B52EE0CC2FCEE96C6DE070EBFCgamimail1Gami_" MIME-Version: 1.0 X-Virus-Scanned: by amavisd-new-2.3.2 (20050629) (Debian) at gami.com --_000_C273A1B35F3C6748B52EE0CC2FCEE96C6DE070EBFCgamimail1Gami_ Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Colyn, Other than curiosity - - it is not, frankly, important that I know what t= he number is supposed to be - - What is important is that nobody has a clue as to what the number is for th= e automotive spark plug mounted in the aircraft application. Keep in mind that the automotive spark plug enjoyes being "heat sunk" into= a massive water cooled cylinder head that is held at constant temperature = from a thermostat. By contrast, the aircraft spark plug is desgined for the much more variable= environment of the air cooled cylinder head which can have temperatures mo= re than twice as high as the automotive cylinder head. There is a casual acceptance of a substantial level of "under-investigati= on" that is associated with some of these often routinely accepted recomm= endations to use components that have not undergone thoughtful testing at= the boundary conditions of realistic operating environments. Regards, George PS> The answer to your question is in some of the APS class materials. We= made a power point slide that detailed the aircraft spark plug ceramic tem= perature as a function of A/F ratio. ________________________________ From: Lancair Mailing List [mailto:lml@lancaironline.net] On Behalf Of Coly= n Case at earthlink Sent: Wednesday, May 28, 2008 9:37 PM To: lml@lancaironline.net Subject: [LML] Re: Electronic ignition spark plugs George said I can tell you the answer to that question with respect to an aviation spar= k plug. okay, what's the answer? say, 50 dF LOP 32" TSIO-550 ....or whatever you ac= tually have. --_000_C273A1B35F3C6748B52EE0CC2FCEE96C6DE070EBFCgamimail1Gami_ Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Colyn,

Other than curiosity - - it is not,=20 frankly, important that I know what the number is supposed to be - -=20

What is important is that nobody has a clu= e=20 as to what the number is for the automotive spark plug mounted in = the=20 aircraft application.

Keep=20 in mind that the automotive spark plug enjoyes being "heat sunk" into= a=20 massive water cooled cylinder head that is held at constant temperature fro= m a=20 thermostat.

By=20 contrast, the aircraft spark plug is desgined for the much more variable=20 environment of the air cooled cylinder head which can have temperatures mor= e=20 than twice as high as the automotive cylinder head.

There=20 is a casual acceptance of a substantial level of <= FONT=20 face=3DArial color=3D#0000ff size=3D2>=20 "under-investigation" that is associated with some of these often=20 routinely accepted recommendations to use components that have not=20 undergone thoughtful testing at the boundary conditions of = ;=20 realistic operating environments.

Regards, George

PS> The answer to your question is in s= ome of=20 the APS class materials. We made a power point slide that detailed th= e=20 aircraft spark plug ceramic temperature as a function of A/F=20 ratio.

From: Lancair Mailing List=20 [mailto:lml@lancaironline.net] On Behalf Of Colyn Case at=20 earthlink
Sent: Wednesday, May 28, 2008 9:37 PM
To:=20 lml@lancaironline.net
Subject: [LML] Re: Electronic ignition spar= k=20 plugs

George said

I can tell you the answer to that question with r= espect=20 to an aviation spark plug.

okay, what's the answer? say, 50 dF LOP 32" TSIO= -550=20 ....or whatever you actually have.

<= /HTML> --_000_C273A1B35F3C6748B52EE0CC2FCEE96C6DE070EBFCgamimail1Gami_--