Return-Path: Sender: (Marvin Kaye) To: flyrotary Date: Sat, 29 Mar 2003 11:12:38 -0500 Message-ID: X-Original-Return-Path: Received: from cpimssmtpu10.email.msn.com ([207.46.181.85] verified) by logan.com (CommuniGate Pro SMTP 4.1b2) with ESMTP id 2091473 for flyrotary@lancaironline.net; Fri, 28 Mar 2003 19:09:54 -0500 X-Originating-IP: 68.7.218.110 Received: from BigAl ([68.7.218.110]) by cpimssmtpu10.email.msn.com with Microsoft SMTPSVC(5.0.2195.4905); Fri, 28 Mar 2003 16:09:18 -0800 Reply-To: From: "Al Gietzen" X-Original-To: "'Rotary motors in aircraft'" Subject: RE: [FlyRotary] Re: Spark Plugs X-Original-Date: Fri, 28 Mar 2003 16:09:43 -0800 Organization: ALVentures X-Original-Message-ID: <000001c2f587$8446fcb0$6400a8c0@BigAl> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook, Build 10.0.4024 Importance: Normal In-Reply-To: X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 X-Original-Return-Path: alventures@email.msn.com X-OriginalArrivalTime: 29 Mar 2003 00:09:18.0314 (UTC) FILETIME=[70E374A0:01C2F587] The rotary can survive a little detonation, but won't take much preignition. Lynn E. Hanover OK, Lynn; now you've done it. I understand that concepts that preignition is ignition of the compressed fuel/mixture prior to the normal ignition by the spark, caused by some hot spot or something; and detonation is a sort of flash, or spontaneous combustion ahead, or away from, the normal flame front caused sonic compression waves, or whatever. How can you tell the difference? And what causes one or the other? And does one lead to the other? When the piston engine in my car "pings" because the timing is too early or the octane is too low, which is it. I've never heard preignition or detonation in a rotary, but if I ever do, now I'm going to want to know which it is. Whenever you find the time. Thanks, Al Gietzen