X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from smtpauth05.mail.atl.earthlink.net ([209.86.89.65] verified) by logan.com (CommuniGate Pro SMTP 4.3c5) with ESMTP id 910915 for flyrotary@lancaironline.net; Thu, 21 Apr 2005 23:14:53 -0400 Received-SPF: pass receiver=logan.com; client-ip=209.86.89.65; envelope-from=Dastaten@earthlink.net Received: from [24.238.206.157] (helo=earthlink.net) by smtpauth05.mail.atl.earthlink.net with asmtp (Exim 4.34) id 1DOocK-00049L-Pm for flyrotary@lancaironline.net; Thu, 21 Apr 2005 23:14:08 -0400 DomainKey-Signature: a=rsa-sha1; q=dns; c=simple; s=test1; d=earthlink.net; h=Message-ID:Date:From:User-Agent:X-Accept-Language:MIME-Version:To:Subject:References:In-Reply-To:Content-Type:Content-Transfer-Encoding; b=fTEv7ZNEg9t0SBoTA/DYezjfRjkmz1WPM4/OHFt0s91o1ocjcRUlvwKwvLhFScdk; Message-ID: <42686BF1.3090304@earthlink.net> Date: Thu, 21 Apr 2005 22:13:53 -0500 From: David Staten User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.4) Gecko/20030624 Netscape/7.1 (ax) X-Accept-Language: en-us, en MIME-Version: 1.0 To: Rotary motors in aircraft Subject: Re: [FlyRotary] Bernie building time 1.8 hours today References: In-Reply-To: Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit X-ELNK-Trace: 9a30bff84e6cb88f95c85d38d22416599ef193a6bfc3dd486dc4b3ecfd3b8c501eee551eb0cada2230febb85a5f48815350badd9bab72f9c350badd9bab72f9c X-Originating-IP: 24.238.206.157 jbker@juno.com wrote: >The only thing that made me uncomfortable today was that when I throttle back to stay out of the red arc on the A/S to about 15 manifold pressue, the engine goes into the unstable up and down hunting that no mixture ratio seems to fix. Any ideas?? > >Bernie, 13+ hours now. > > > I would guess that you have a portion of your mixture map "corrupted" or mis-programmed. Just a hunch.. either that or (not knowing a single thing about your upper deck setup) perhaps your MAP sense lines are in a turbulent spot behind the throttle plate(s). Just thinking out loud without any practical experience to back it up. Dave Staten