X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Thu, 08 Nov 2012 09:21:33 -0500 Message-ID: X-Original-Return-Path: Received: from nm40-vm7.bullet.mail.ne1.yahoo.com ([98.138.229.183] verified) by logan.com (CommuniGate Pro SMTP 6.0c2) with ESMTPS id 5868235 for lml@lancaironline.net; Thu, 08 Nov 2012 07:12:45 -0500 Received-SPF: none receiver=logan.com; client-ip=98.138.229.183; envelope-from=casey.gary@yahoo.com Received: from [98.138.226.179] by nm40.bullet.mail.ne1.yahoo.com with NNFMP; 08 Nov 2012 12:12:06 -0000 Received: from [98.138.89.168] by tm14.bullet.mail.ne1.yahoo.com with NNFMP; 08 Nov 2012 12:12:06 -0000 Received: from [127.0.0.1] by omp1024.mail.ne1.yahoo.com with NNFMP; 08 Nov 2012 12:12:06 -0000 X-Yahoo-Newman-Property: ymail-3 X-Yahoo-Newman-Id: 576778.1657.bm@omp1024.mail.ne1.yahoo.com Received: (qmail 91390 invoked by uid 60001); 8 Nov 2012 12:12:06 -0000 DomainKey-Signature:a=rsa-sha1; q=dns; c=nofws; s=s1024; d=yahoo.com; h=X-YMail-OSG:Received:X-Rocket-MIMEInfo:X-Mailer:References:Message-ID:Date:From:Reply-To:Subject:To:In-Reply-To:MIME-Version:Content-Type; b=4btNZgSaxWLdU4gHuPmOWxtqnY64BrI6iprpy2WQ4DV/XeaiDnhOfaZH3mvwR8B5EdWM74tiN8eAq9vC3w7ht7nhxTZXtuZ9eEh+m8ewB6gGuurCwsFdonAQcA0UXwlR4jMoRtC27ZpZqsxvAAn1nQQofWy3Qhc8OJysdDisbG8=; X-YMail-OSG: V83xXDgVM1mLeuuKmDoX8bSQSbf8jyNEWF0pKWc.h_LWHBI 2mLLxAQ2m6FZ.FPMqdS3skS0cykmrnQujC3T0U0ydSrttYMVY0FDc6n6k2Xj R3QkzJ0KniaBcM0Ly8.gfoo17Y4hzn3unnUac2O_qXrKQ8_Pfqpf.CuC.qm8 nmu_dPxGda8dEdSD97Wu9zgK6igtCn8i1ZOJMCvoBuT6Y8KySGkREDCkw2le Aor4llXUYfZVuur3ZrrdX1stcEkETJ.IUUnfuF7MZotdsDtTzDxTmJt3k9aw 4uaS1nX73VtFVCl5J.FefmPjyYs_v6k0oq1Gxp.eJLd4hW3j43TUdpA1qavt p2sM.xwU4985lvlGdQuVtJaTLWMs_GrGuqhp2QlZksKjfOoZ1cOCG_0sBkRS A.tUEDX.lP6CH5CE98jUg6v53JLXCS81LmrcpsDNzoDPcS4xfqZWzrmeBvik k1CZUyaS4cffft7UtXs.hXpdMIgRj3FBFjFqMWAx.hLH2OZipak_1doUXQX3 LobSgLIhO8fI0 Received: from [71.208.250.23] by web120104.mail.ne1.yahoo.com via HTTP; Thu, 08 Nov 2012 04:12:05 PST X-Rocket-MIMEInfo: 001.001,VGhhdCdzIGEgZ29vZCBwb2ludCwgUGF1bC4gwqBJIGhhdmUgc2VlbiAibmV3IiBDZXNzbmFzIHdpdGggYW4gaW5zdWxhdGluZyB3cmFwIGFyb3VuZCB0aGUgYnJlYXRoZXIgdHViZS4gwqBJIHN1c3BlY3QgdGhlcmUgYXJlIHR3byBwbGFjZXMgd2hlcmUgdGhhdCB3b3VsZCBoZWxwIHByZXZlbnQgaWNlIGJ1aWxkdXAgYW5kIHN1YnNlcXVlbnQgb2JzdHJ1Y3Rpb24uIMKgT25lIGlzIG9uIHRvcCBvZiB0aGUgZW5naW5lIHdoZXJlIGEgZ29vZCBsZW5ndGggb2YgYnJlYXRoZXIgdHViZSBpcyBpbiB0aGUgImNvbGQBMAEBAQE- X-Mailer: YahooMailWebService/0.8.123.460 References: X-Original-Message-ID: <1352376725.91307.YahooMailNeo@web120104.mail.ne1.yahoo.com> X-Original-Date: Thu, 8 Nov 2012 04:12:05 -0800 (PST) From: Gary Casey Reply-To: Gary Casey Subject: Re: 0-550 Engine Oil Loss - Oil going overboard X-Original-To: Lancair Mailing List In-Reply-To: MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="-1312421089-754509518-1352376725=:91307" ---1312421089-754509518-1352376725=:91307 Content-Type: text/plain; charset=iso-8859-1 Content-Transfer-Encoding: quoted-printable That's a good point, Paul. =A0I have seen "new" Cessnas with an insulating = wrap around the breather tube. =A0I suspect there are two places where that= would help prevent ice buildup and subsequent obstruction. =A0One is on to= p of the engine where a good length of breather tube is in the "cold" side = of the engine. =A0The other is near the outlet where the blowby has already= cooled and the exposed portion is in the cold airstream. =A0But my specula= tion is that a pressure drop in the system causes oil to be pushed out of t= he crankcase through the separator drain line, and for that to happen the r= estriction (caused by freezing or something else) has to be between the bre= ather vent and separator. =A0I wonder if it isn't best to just add more sim= plicity by eliminating the separator and accepting the minor oil loss. =A0H= as any OEM included separators with their product? =A0Maybe, but I've never= seen one.=0AGary=0A=0APreviously from Paul:=0AFWIW, I have the Legacy IO-5= 50 and no separator installed.=A0 Factory new engine with almost 700 hours.= =A0 I go through about 1.5QT of oil between 25-30h oil changes (W100).=A0 I= have a small amount on the belly to clean off and the breather exit is loc= ated on the bottom. Compressions are high 70s on all the cylinders.=0A=0ATh= e breathers on my previous TSIO-520s (Cessna) experienced freezing at FL al= titudes and Cessna had drilled a hole at the top of the tube and facing upw= ards as a safety measure if blockage occurred.=A0 Is there any chance that = temperature is playing a role in these incidents?=0A=0APaul=0A ---1312421089-754509518-1352376725=:91307 Content-Type: text/html; charset=iso-8859-1 Content-Transfer-Encoding: quoted-printable
That's a good point, Paul.  I h= ave seen "new" Cessnas with an insulating wrap around the breather tube. &n= bsp;I suspect there are two places where that would help prevent ice buildu= p and subsequent obstruction.  One is on top of the engine where a goo= d length of breather tube is in the "cold" side of the engine.  The ot= her is near the outlet where the blowby has already cooled and the exposed = portion is in the cold airstream.  But my speculation is that a pressu= re drop in the system causes oil to be pushed out of the crankcase through = the separator drain line, and for that to happen the restriction (caused by= freezing or something else) has to be between the breather vent and separator.  I wonder if it isn't best to just add more simplicity by = eliminating the separator and accepting the minor oil loss.  Has any O= EM included separators with their product?  Maybe, but I've never seen= one.
Gar= y

Previously = from Paul: