X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Wed, 28 May 2008 20:55:32 -0400 Message-ID: X-Original-Return-Path: Received: from bay0-omc3-s6.bay0.hotmail.com ([65.54.246.206] verified) by logan.com (CommuniGate Pro SMTP 5.2.3) with ESMTP id 2941674 for lml@lancaironline.net; Tue, 27 May 2008 22:10:32 -0400 Received-SPF: pass receiver=logan.com; client-ip=65.54.246.206; envelope-from=randystuart@hotmail.com Received: from hotmail.com ([65.54.168.73]) by bay0-omc3-s6.bay0.hotmail.com with Microsoft SMTPSVC(6.0.3790.3959); Tue, 27 May 2008 19:09:55 -0700 Received: from mail pickup service by hotmail.com with Microsoft SMTPSVC; Tue, 27 May 2008 19:09:55 -0700 X-Original-Message-ID: Received: from 68.183.42.32 by BAY113-DAV1.phx.gbl with DAV; Wed, 28 May 2008 02:09:50 +0000 X-Originating-IP: [68.183.42.32] X-Originating-Email: [randystuart@hotmail.com] X-Sender: randystuart@hotmail.com From: "Randy" X-Original-To: "Lancair Mailing List" References: Subject: Re: [LML] EI, plugs, detonation X-Original-Date: Tue, 27 May 2008 19:09:50 -0700 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_006D_01C8C02D.3C88AAB0" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2900.3138 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.3198 X-OriginalArrivalTime: 28 May 2008 02:09:55.0375 (UTC) FILETIME=[EC0193F0:01C8C067] X-Original-Return-Path: randystuart@hotmail.com This is a multi-part message in MIME format. ------=_NextPart_000_006D_01C8C02D.3C88AAB0 Content-Type: text/plain; charset="Windows-1252" Content-Transfer-Encoding: quoted-printable Paul,=20 With all due respect. Your guess is wrong. I was there, I saw what I = saw. I've seen the damaged parts and what's left of the plugs. I've been = building and working with hi performance engines most of my life. Your = O-235 is not the standard of all aviation engines. Anyone that thinks = aviation spark plugs and auto plugs are exactly the same, except for the = socket used to install them, should not be using auto plugs. The = application design is far different, the heat range is far different. = Aviation engines and auto engines are designed for two completely = different uses. They run at different RPM's, different loads, different = ambient pressures, different ignition systems, different timing, = different fuels. If all spark plugs were exactly the same there would = only be one spark plug on the market.=20 If your airplane's worth is a mere $1.67 per plug, then I wish you well. = But the first time you witness a very well built, hi performance = Lycoming lose a cylinder over a $1.67 auto plug, I bet you'll stop using = them.=20 When I'm flying over 200kts down the so cal coast at 50 feet, I like the = peace of mind that the parts in my engine are designed for and time = tested for aviation use.=20 Anyone that wants to run whatever they want is fine, that's why this is = called experimental.=20 Randy Stuart LNC-2 ----- Original Message -----=20 From: Paul Lipps=20 To: lml@lancaironline.net=20 Sent: Tuesday, May 27, 2008 3:54 PM Subject: [LML] EI, plugs, detonation Randy: I think what you mean is pre-ignition, not detonation, to take = out cylinders. Severe detonation may cause peening of the top of the = piston, broken ring lands, or cause hot spots which could result in = pre-ignition, but it is usually the incredible temperatures and = pressures associated with pre-ignition that will "hole" pistons. (See = Contact! magazine issue 57 for a comprehensive treatment of detonation = and pre-ignition). From your description I would hazard a guess that = what you saw resulted from incorrect timing and mixture. My O-235 is = 9.7:1, and I have dual LSE Plasma Is; My $1.67 Denso plugs run so clean, = with no electrode wear! And my coils are on top of my engine! ------=_NextPart_000_006D_01C8C02D.3C88AAB0 Content-Type: text/html; charset="Windows-1252" Content-Transfer-Encoding: quoted-printable
Paul,=20
With all due = respect. Your=20 guess is wrong. I was there, I saw what I saw. I've seen the damaged = parts and=20 what's left of the plugs. I've been building and working with hi=20 performance engines most of my life. Your O-235 is not the standard = of all=20 aviation engines. Anyone that thinks aviation spark plugs and auto plugs = are=20 exactly the same, except for the socket used to install them, should not = be=20 using auto plugs. The application design is far different, the heat = range is far=20 different. Aviation engines and auto engines are designed for two = completely=20 different uses. They run at different RPM's, different loads, different = ambient=20 pressures, different ignition systems, different timing, different = fuels. If all=20 spark plugs were exactly the same there would only be one spark plug on = the=20 market.
If your airplane's = worth is a=20 mere $1.67 per plug, then I wish you well. But the first time you = witness a very=20 well built, hi performance Lycoming lose a cylinder over a = $1.67 auto plug,=20 I bet you'll stop using them.
When I'm flying = over 200kts=20 down the so cal coast at 50 feet, I like the peace of mind that the = parts in=20 my engine are designed for and time tested for aviation use.=20
Anyone that wants = to run=20 whatever they want is fine, that's why this is called experimental.=20
 
Randy=20 Stuart
LNC-2
 
----- Original Message -----
From:=20 Paul=20 Lipps
Sent: Tuesday, May 27, 2008 = 3:54 PM
Subject: [LML] EI, plugs,=20 detonation

Randy: I think what you mean is pre-ignition, = not=20 detonation, to take out cylinders. Severe detonation may cause peening = of the=20 top of the piston, broken ring lands, or cause hot spots which could = result in=20 pre-ignition, but it is usually the incredible temperatures and = pressures=20 associated with pre-ignition that will "hole" pistons. (See Contact! = magazine=20 issue 57 for a comprehensive treatment of detonation and = pre-ignition). From=20 your description I would hazard a guess that what you saw resulted = from=20 incorrect timing and mixture. My O-235 is 9.7:1, and I have dual LSE = Plasma=20 Is; My $1.67 Denso plugs run so clean, with no electrode wear! = And my=20 coils are on top of my engine!
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