X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Tue, 06 Nov 2012 08:06:17 -0500 Message-ID: X-Original-Return-Path: Received: from nm4-vm7.bullet.mail.gq1.yahoo.com ([98.136.218.166] verified) by logan.com (CommuniGate Pro SMTP 6.0c2) with ESMTPS id 5863784 for lml@lancaironline.net; Mon, 05 Nov 2012 20:11:45 -0500 Received-SPF: none receiver=logan.com; client-ip=98.136.218.166; envelope-from=mcmess1919@yahoo.com Received: from [98.137.12.190] by nm4.bullet.mail.gq1.yahoo.com with NNFMP; 06 Nov 2012 01:11:09 -0000 Received: from [98.136.185.44] by tm11.bullet.mail.gq1.yahoo.com with NNFMP; 06 Nov 2012 01:11:08 -0000 Received: from [127.0.0.1] by smtp105.mail.gq1.yahoo.com with NNFMP; 06 Nov 2012 01:11:08 -0000 X-Yahoo-Newman-Id: 884894.13059.bm@smtp105.mail.gq1.yahoo.com X-Yahoo-Newman-Property: ymail-3 X-YMail-OSG: A6r.ydcVM1nXZl0NbhzrK0BIR5ah4q1dz.yogbScQ0QZscz aLX9v2H71MJ9xmIAMdWolSiU7B.8q4fUDdCQRTeHySb9aqqHP2BQVL0B82GN FHYVG4GGw98Vi9lV_zWEEvNGfzWBE2kc2vx2WRhBtRtRM1muKp2gqt78xKck L3vLlj54OxVE0u_yXfiugFiwwrxILEkDpi._bbOzB0zGZiqA4lAB0x7MKVOw 0g2UWOjIHhq2._DTCwB2eVh8PCWCjgXg6zdKHsH.rUszTkNRh1Bp4Ba8FbK7 tejHT_KbPlgcqRN6vZEVRGpWtVxZanLB_pEeFmaqtVWaa9tYyIGptTPl1iKy fQrf_M9NxHY2WiCWQ6kJh_nwJpkDC1AXSOLlx7q42LbzoV_ljJV7mMJ1sy.5 oknfKqelvTV_6QjxE9Conv3uckRiThk1Z5tmBHGhqcts.Eu2WtDPxHMk3RD1 F6ZqXW3G7kejo7YxujhOzYG_f53PP7w-- X-Yahoo-SMTP: rK4i7HqswBC7mDE8.sOiWQeO4CeReXc- Received: from StevePC (mcmess1919@24.28.81.128 with login) by smtp105.mail.gq1.yahoo.com with SMTP; 05 Nov 2012 17:11:08 -0800 PST From: "Steve Colwell" X-Original-To: "'Lancair Mailing List'" References: In-Reply-To: Subject: Oil going overboard X-Original-Date: Mon, 5 Nov 2012 19:11:08 -0600 X-Original-Message-ID: <002601cdbbbb$9aceb950$d06c2bf0$@com> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0027_01CDBB89.50344950" X-Mailer: Microsoft Office Outlook 12.0 Thread-Index: Ac27nYsBG3hbYZ8qQmyIm+apUZTsswAGOGxQ Content-Language: en-us This is a multi-part message in MIME format. ------=_NextPart_000_0027_01CDBB89.50344950 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Craig, I learned about a blocked crankcase vent on the first flight of my first airplane (an Alon Aircoupe). It had been used as a 15 minute flight commuter causing complete blockage of the vent over time. On the return home flight, pressure would build in the crankcase until first one accessory gasket after another would blow, after the last one to blow had been fixed. We did not figure it out until three different gaskets had failed. The reason for this story is to explain that the crankcase pressure gage on our Legacy was tapped into the vent line at about the half way point. I did not block the vent line, just measured the pressure. The piston ring land and ring wear was way over tolerance on all six pistons. Replacing the Performance pistons with new ECI pistons and rings solved the problem. All cylinders were new with about 50 hours on them, one was so worn it had to be replated, the others honed out OK. ECI helped me out of a very stressful and expensive week after week search to identify the problem and it was not their pistons that failed. Steve Colwell From: Lancair Mailing List [mailto:lml@lancaironline.net] On Behalf Of Craig Berland Sent: Monday, November 05, 2012 3:35 PM To: lml@lancaironline.net Subject: [LML] Oil going overboard "I checked my crank pressure by hooking a pressure gauge to the breather (before the separator) and it is high somewhere in the 4-5 psi." Don't do this.you either had a leak at your pressure gage or you blew out a gasket. All engines have blow-by or combustion gases that get by the piston rings and you will continue to build pressure until something breaks. You must let your engine crankcase "breath". The test you wanted to do was a blow-by "flow" test. I am NOT a IO-550 expert but I would guess .5 CFM at idle and 2-3 CFM at cruise would be normal. I believe your air/oil separator inlet should be located higher than the engine fill tube vent outlet. Maybe that is causing your problem. Since the problem is intermittent, I would rule out piston rings. Craig Berland N7VG ------=_NextPart_000_0027_01CDBB89.50344950 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Craig,

 

I learned about a = blocked crankcase vent on the first flight of my first airplane (an Alon = Aircoupe).  It had been used as a 15 minute flight commuter causing = complete blockage of the vent over time.  On the return home = flight, pressure would build in the crankcase until first one accessory = gasket after another would blow, after the last one to blow had been = fixed.  We did not figure it out until three different gaskets had = failed. 

The reason for this story is to explain that the = crankcase pressure gage on our Legacy was tapped into the vent line at = about the half way point.  I did not block the vent line, just = measured the pressure. 

The piston ring land and = ring wear was way over tolerance on all six pistons.  Replacing the = Performance pistons with new ECI pistons and rings solved the = problem.  All cylinders were new with about 50 hours on them, one = was so worn it had to be replated, the others honed out OK.  ECI = helped me out of a very stressful and expensive week after week search = to identify the problem and it was not their pistons that failed.  =

 

Steve Colwell =

 

From:= = Lancair Mailing List [mailto:lml@lancaironline.net] On Behalf Of = Craig Berland
Sent: Monday, November 05, 2012 3:35 = PM
To: lml@lancaironline.net
Subject: [LML] Oil = going overboard

 

"I = checked my crank pressure by hooking a pressure gauge to the breather = (before the separator) and it is high somewhere in the 4-5 = psi."

Don’t do this…you either had a leak at your pressure = gage or you blew out a gasket.  All engines have blow-by or = combustion gases that get by the piston rings and you will continue to = build pressure until something breaks.  You must let your engine = crankcase “breath”.  The test you wanted to do was a = blow-by “flow” test.  I am NOT a IO-550 expert but I = would guess .5 CFM at idle and 2-3 CFM at cruise would be normal.  = I believe your air/oil separator inlet should be located higher than the = engine fill tube vent outlet.  Maybe that is causing your = problem.  Since the problem is intermittent, I would rule out = piston rings.

Craig Berland

N7VG

 



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