X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from [161.88.255.140] (account marv@lancaironline.net) by logan.com (CommuniGate Pro WebUser 4.3.4) with HTTP id 1011258 for lml@lancaironline.net; Thu, 23 Jun 2005 10:55:57 -0400 From: "Marvin Kaye" Subject: Re: [LML] Re: Induction air filter To: lml X-Mailer: CommuniGate Pro WebUser Interface v.4.3.4 Date: Thu, 23 Jun 2005 10:55:57 -0400 Message-ID: In-Reply-To: References: MIME-Version: 1.0 Content-Type: text/plain; charset="ISO-8859-1"; format="flowed" Content-Transfer-Encoding: 8bit Posted for Walter Atkinson : Craig: Thanks. Good points. As George pointed out, a lot of the problem is the fuzzy definitions between light, medium, and heavy detonation AND then being able to determine without doubt that there was no pre-ignition. One engine in particular was run about 20 hours in light detonation, about 2-3 hours in medium detonation and under about 30 minutes of heavy detonation and upon tear-down it looked like a very clean, normal engine. No pot-marks, no visible ill effects whatsoever. BUT, we were very confident that it had never experienced pre-ignition. This experience is what changed our view of the dangers of detonation--as long as CHTs are controlled and there is no pre-ignition, it's far less damaging than we have thought. Without an engine monitor download, that's pretty hard to determine. If there is an engine monitor download, it's not so hard to see whether or not there was some pre-ignition. Walter