Return-Path: Sender: "Marvin Kaye" To: lml@lancaironline.net Date: Fri, 21 Jan 2005 19:13:33 -0500 Message-ID: X-Original-Return-Path: Received: from [208.57.0.8] (HELO mgci.com) by logan.com (CommuniGate Pro SMTP 4.2.8) with SMTP id 616722 for lml@lancaironline.net; Fri, 21 Jan 2005 16:43:38 -0500 Received-SPF: none receiver=logan.com; client-ip=208.57.0.8; envelope-from=woodruff@swefco.com Received: (qmail 15123 invoked by uid 0); 21 Jan 2005 21:43:08 -0000 Received: from unknown (HELO ?192.168.0.2?) (66.18.129.84) by mgci.com with SMTP; 21 Jan 2005 21:43:08 -0000 User-Agent: Microsoft-Entourage/10.1.4.030702.0 X-Original-Date: Fri, 21 Jan 2005 13:43:01 -0800 Subject: Re: [LML] Re: IV-P continental detonati.. From: Hal Woodruff X-Original-To: Lancair Mailing List X-Original-Message-ID: In-Reply-To: Mime-version: 1.0 Content-type: multipart/alternative; boundary="B_3189159782_5139391" > This message is in MIME format. Since your mail reader does not understand this format, some or all of this message may not be legible. --B_3189159782_5139391 Content-type: text/plain; charset="ISO-8859-1" Content-transfer-encoding: quoted-printable Jeff, About a year ago I had problems when running LOP at 31=B2 MAP & 2500 rpm. At any setting LOP I would get a =B3surging=B2 sensation, and at leaner settings (16.5 gph and less) the engine would backfire (forward fire? Unused gas would burn rapidly in the exhaust) causing a popping or banging sound. Running at 125=B0 ROP the problem would immediately go away. Doing a mag check in flight revealed a problem with the right magneto. When I removed the magneto I found some sort of =B3growth=B2 (fungus?) inside the right mag. I ultimately ended up replacing the mag and have never had any backfiring or surging since. Problem solved. Also, you should check the pressurization lines going to the mags. I found that the blue filter device that=B9s inline between the mags and the intake manifold was loose. The clamps had loosened. My first inclination was tha= t I wasn=B9t developing deck pressure in the mags allowing arcing at high altitude. This might have been happening but I think the gunk in the right mag was the ultimate culprit. I don=B9t think that I=B9ve ever experienced a compressor stall. I typically cruise at 31=B2 MAP, 2450 RPM, and 16.5 gal/hr with no problems. I=B9ve got an =B3E=B2 engine. Good luck, Hal Woodruff --B_3189159782_5139391 Content-type: text/html; charset="ISO-8859-1" Content-transfer-encoding: quoted-printable Re: [LML] Re: IV-P continental detonati.. Jeff,

About a year ago I had problems when running LOP at 31” MAP & 250= 0 rpm.  At any setting LOP I would get a “surging” sensatio= n, and at leaner settings (16.5 gph and less) the engine would backfire (for= ward fire?  Unused gas would burn rapidly in the exhaust) causing a pop= ping or banging sound.   Running at 125° ROP the problem would= immediately go away.  Doing a mag check in flight revealed a problem w= ith the right magneto.

When I removed the magneto I found some sort of “growth” (fungu= s?) inside the right mag.  I ultimately ended up replacing the mag and = have never had any backfiring or surging since.  Problem solved.

Also, you should check the pressurization lines going to the mags.  I = found that the blue filter device that’s inline between the mags and t= he intake manifold was loose.  The clamps had loosened.  My first = inclination was that I wasn’t developing deck pressure in the mags all= owing arcing at high altitude.  This might have been happening but I th= ink the gunk in the right mag was the ultimate culprit.

I don’t think that I’ve ever experienced a compressor stall. &n= bsp;I typically cruise at 31” MAP, 2450 RPM, and 16.5 gal/hr with no p= roblems.  I’ve got an “E” engine.

Good luck,
Hal Woodruff


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