X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Thu, 23 Jun 2005 10:14:22 -0400 Message-ID: X-Original-Return-Path: Received: from systems3.net ([68.14.236.16] verified) by logan.com (CommuniGate Pro SMTP 4.3.4) with ESMTPS id 1011206 for lml@lancaironline.net; Thu, 23 Jun 2005 10:04:17 -0400 Received-SPF: none receiver=logan.com; client-ip=68.14.236.16; envelope-from=cberland@systems3.net Received: from systems0d3b724 ([192.168.1.81]) by systems3.net (8.13.4/8.13.4/Debian-1) with SMTP id j5NE3WDZ032697 for ; Thu, 23 Jun 2005 07:03:32 -0700 X-Original-Message-ID: <001001c577fc$2e698b60$5101a8c0@systems0d3b724> From: "Craig Berland" X-Original-To: "Lancair Mail List" Subject: [LML] Re: Induction air filter X-Original-Date: Thu, 23 Jun 2005 07:02:19 -0700 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_000D_01C577C1.7EF7F520" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2800.1506 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1506 This is a multi-part message in MIME format. ------=_NextPart_000_000D_01C577C1.7EF7F520 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Scott: He has de-constructed one or more pistons in the prior engine - = detonation was the culprit.=20 Amazingly, probably not! We have watched many detonation events--some = even heavy detonation events--some for extended periods-without any ill = effects on the piston, cylinder or engine in general. The danger is = these turning into pre-ignition, usually from a damaged spark plug from = the detonation. That can destroy the engine in 30 seconds and while our = observations are that detonation doesn't hole a piston, pre-ignition = will do it in a heartbeat. Detonation gets blamed for a lot for which it is completely innocent! = Walter Walter, I agree detonation will not quickly cause catastrophic damage to = an engine. However, if you ever tear down an engine and see pot marks = on the piston....that's the result of detonation. This can get bad = enough to erode the edge of the piston away and break down the ring = lands and the rings. I was driving a dyno once and saw the beam fall and = before I could accept something was wrong....there was an explosion in = the crankcase....pre-ignition....30 seconds is a good bet. Craig Berland ------=_NextPart_000_000D_01C577C1.7EF7F520 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable

Scott:
He has = de-constructed=20 one or more pistons in the prior engine - detonation was the=20 culprit.

Amazingly, probably not! We have = watched many=20 detonation events--some even heavy detonation events--some for extended=20 periods-without any ill effects on the piston, cylinder or engine in = general.=20 The danger is these turning into pre-ignition, usually from a damaged = spark plug=20 from the detonation. That can destroy the engine in 30 seconds and while = our=20 observations are that detonation doesn't hole a piston, pre-ignition = will do it=20 in a heartbeat.
Detonation gets blamed for a lot for which it is = completely=20 innocent! <g>
Walter

Walter, I agree detonation will not quickly cause catastrophic = damage to an=20 engine. However, if you ever tear down an engine and see pot marks = on the=20 piston....that's the result of detonation. This can get bad enough to = erode the=20 edge of the piston away and break down the ring lands and the rings. I = was=20 driving a dyno once and saw the beam fall and before I could accept = something=20 was wrong....there was an explosion in the = crankcase....pre-ignition....30=20 seconds is a good bet.

Craig Berland

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