X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from smtp813.mail.sc5.yahoo.com ([66.163.170.83] verified) by logan.com (CommuniGate Pro SMTP 4.3c5) with SMTP id 912290 for flyrotary@lancaironline.net; Sat, 23 Apr 2005 13:54:32 -0400 Received-SPF: none receiver=logan.com; client-ip=66.163.170.83; envelope-from=tim2542@sbcglobal.net Received: from unknown (HELO ?127.0.0.1?) (tim2542@sbcglobal.net@67.117.29.217 with plain) by smtp813.mail.sc5.yahoo.com with SMTP; 23 Apr 2005 17:53:47 -0000 Message-ID: <426A8BA9.8030900@sbcglobal.net> Date: Sat, 23 Apr 2005 10:53:45 -0700 From: Tim Andres User-Agent: Mozilla Thunderbird 1.0.2 (Windows/20050317) X-Accept-Language: en-us, en MIME-Version: 1.0 To: Rotary motors in aircraft Subject: Re: [FlyRotary] Re: All Parts have arrived, Whew! References: In-Reply-To: Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Finn Lassen wrote: > George Lendich wrote: > >> Finn, >> Quite obviously you haven't been following the thread, Ed has >> exhausted most possible problems. > > Not to my satisfaction, he hasn't. > It's either a foreign object or some other factor yet to be identified > in this thread. > > Finn I'm no reotary expert (see! I can't even spell it!) but I have seen some pretty bizarre damage on piston engines caused by detonation/preingnition. Like piston rings broken and I can easily equate this to an apex seal. I haven't seen this discussed much on this thread, there might be no "witness marks" left behind. One clue might be plug color. It could be something like an intake leak, mixture problem, incorrect heat range plug, timing issue, even a long gone piece of hot carbon. FWIW, Tim Andres