X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Sun, 30 Apr 2006 13:53:39 -0400 Message-ID: X-Original-Return-Path: Received: from smtp108.sbc.mail.mud.yahoo.com ([68.142.198.207] verified) by logan.com (CommuniGate Pro SMTP 5.0.9) with SMTP id 1085222 for lml@lancaironline.net; Sat, 29 Apr 2006 00:40:35 -0400 Received-SPF: none receiver=logan.com; client-ip=68.142.198.207; envelope-from=elippse@sbcglobal.net Received: (qmail 87052 invoked from network); 29 Apr 2006 04:39:49 -0000 Received: from unknown (HELO Computerroom) (elippse@sbcglobal.net@70.237.144.95 with login) by smtp108.sbc.mail.mud.yahoo.com with SMTP; 29 Apr 2006 04:39:48 -0000 X-Original-Message-ID: <000501c66b46$f81498e0$5f90ed46@Computerroom> From: "Paul Lipps" X-Original-To: "Marv Kaye" Subject: pre-ignition X-Original-Date: Fri, 28 Apr 2006 21:39:55 -0700 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0002_01C66B0C.4A122300" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2900.2869 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.2869 This is a multi-part message in MIME format. ------=_NextPart_000_0002_01C66B0C.4A122300 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Forgive this old fart's faulty memory; In my previous posting, I said = that pre-ignition could occur as much as 90 degrees before TDC. In = re-reading the article, here is what he says: "I want to emphasis [sic] = that when most people think of pre-ignition, they generally accept the = fact that the charge was ignited before the spark plug fires. However, I = believe they limit their thinking to 5-10 degrees before the spark plug = fires. You have to really accept that the most likely point for = pre-ignition to occur is 180 degrees BTDC, some 160 degrees before the = spark plug would have fired because that's the point (if there is a = glowing ember in the chamber) when it's most likely to be ignited. We = are talking some 160-180 degrees of burn being compressed that would = normally be relatively cool. A piston will only take a few revolutions = of that distress before it fails. As for detonation, it can get hammered = on for seconds, minutes, or hours before any damage occurs, pre-ignition = damage is almost instantaneous." This article is a must for anyone who = wants to run a lot of boost! ------=_NextPart_000_0002_01C66B0C.4A122300 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
Forgive this old fart's faulty memory; In my = previous=20 posting, I said that pre-ignition could occur as much as 90 degrees = before TDC.=20 In re-reading the article, here is what he says: "I want to=20 emphasis [sic] that when most people think of = pre-ignition, they=20 generally accept the fact that the charge was ignited before the spark = plug=20 fires. However, I believe they limit their thinking to 5-10 degrees = before the=20 spark plug fires. You have to really accept that the most likely point = for=20 pre-ignition to occur is 180 degrees BTDC, some 160 degrees before the = spark=20 plug would have fired because that's the point (if there is a glowing = ember in=20 the chamber) when it's most likely to be ignited. We are talking some = 160-180=20 degrees of burn being compressed that would normally be relatively cool. = A=20 piston will only take a few revolutions of that distress before it = fails. As for=20 detonation, it can get hammered on for seconds, minutes, or hours = before=20 any damage occurs, pre-ignition damage is almost = instantaneous."=20 This article is a must for anyone who wants to run a lot of=20 boost!
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