X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: <13brv3@bellsouth.net> Received: from imf19aec.mail.bellsouth.net ([205.152.59.67] verified) by logan.com (CommuniGate Pro SMTP 4.3.6) with ESMTP id 613427 for flyrotary@lancaironline.net; Sun, 24 Jul 2005 10:36:14 -0400 Received-SPF: pass receiver=logan.com; client-ip=205.152.59.67; envelope-from=13brv3@bellsouth.net Received: from ibm60aec.bellsouth.net ([65.6.194.9]) by imf19aec.mail.bellsouth.net with ESMTP id <20050724143521.GOZI27112.imf19aec.mail.bellsouth.net@ibm60aec.bellsouth.net> for ; Sun, 24 Jul 2005 10:35:21 -0400 Received: from rd ([65.6.194.9]) by ibm60aec.bellsouth.net with ESMTP id <20050724143520.RJTI3347.ibm60aec.bellsouth.net@rd> for ; Sun, 24 Jul 2005 10:35:20 -0400 From: "Russell Duffy" <13brv3@bellsouth.net> To: "'Rotary motors in aircraft'" Subject: RE: [FlyRotary] Re: Lycoming debugging test - -HELP! Date: Sun, 24 Jul 2005 09:35:20 -0500 Message-ID: <008201c5905c$eb3a88c0$6101a8c0@rd> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0083_01C59033.026480C0" X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook, Build 10.0.6626 Importance: Normal X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.2527 In-Reply-To: This is a multi-part message in MIME format. ------=_NextPart_000_0083_01C59033.026480C0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable What kind of problems? How would a [small enough to be hard to detect] exhaust leak cause such a massive power failure? What kind of failure = might that be? At 2100 rpm the plane is just barely capable of level flight. Hi Jim, =20 As I mentioned, this cracking of exhaust is probably more of a two = stroke problem, but I knew I had read a similar account where the exhaust crack = was the problem. The following is a reply to someone who was changing his = fuel pump again, because he couldn't figure out what was causing his = problems. Again, this was a Rotax. No reason to believe it would work the same on = a Lycoming, or a rotary, but I figured it wouldn't hurt to throw it out = there. =20 Rusty (happy to not be at the 110F heat index hanger today) =20 I had a similar problem a few years ago which had me running around = in circles. It turned out I had a hairline crack in the muffler. When = things began to heat up the crack would open and everything would go to hell, engine would roughen, egts would go up. I'd land and then start it again and = it would run fine. It turned out the crack would only open up when the = engine was at opperating temp. When the engine was cold you couldn't see it. = This by the way is an excellent argument for using the Jet hot process on = your muffler because it will show a black line or soot from any leak. = Anyway, good luck, and take a good look at you exhaust system for leaks. =20 =20 ------=_NextPart_000_0083_01C59033.026480C0 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Message
What kind = of=20 problems?  How would a [small enough to be hard to detect] exhaust = leak=20 cause such a massive power failure?  What kind of failure might = that=20 be?  At 2100 rpm the plane is just barely capable of level=20 flight.
Hi Jim,
 
As I mentioned, this cracking of exhaust is probably = more of a two=20 stroke problem, but I knew I had read a similar account where the = exhaust crack=20 was the problem.  The following is a reply to someone who was = changing his=20 fuel pump again, because he couldn't figure out what was causing his = problems.=20 Again, this was a Rotax.  No reason to believe it would work the = same on a=20 Lycoming, or a rotary, but I figured it wouldn't hurt to throw it out=20 there.
 
Rusty (happy to not be at the 110F heat index hanger=20 today)
 
   I had a = similar=20 problem a few years ago which had me running around in
circles.  = It=20 turned out I had a hairline crack in the muffler.  When = things
began to=20 heat up the crack would open and everything would go to hell, = engine
would=20 roughen, egts would go up.  I'd land and then start it again and=20 it
would run fine.  It turned out the crack would only open up = when the=20 engine
was at opperating temp.  When the engine was cold you = couldn't=20 see it.  This
by the way is an excellent argument for using the = Jet hot=20 process on your
muffler because it will show a black line or soot = from any=20 leak.  Anyway, good
luck, and take a good look at you exhaust = system for=20 leaks.
 
 

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