X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Mon, 05 Nov 2012 16:35:08 -0500 Message-ID: X-Original-Return-Path: Received: from outbound-jr2.exchangedefender.com ([65.99.255.229] verified) by logan.com (CommuniGate Pro SMTP 6.0c2) with ESMTPS id 5862939 for lml@lancaironline.net; Mon, 05 Nov 2012 12:13:17 -0500 Received-SPF: none receiver=logan.com; client-ip=65.99.255.229; envelope-from=cberland@systems3.net Received: from remote.systems3.net (wsip-98-172-79-178.ph.ph.cox.net [98.172.79.178]) by outbound-jr2.exchangedefender.com (8.13.8/8.13.8) with ESMTP id qA5HCadM023986 (version=TLSv1/SSLv3 cipher=AES128-SHA bits=128 verify=OK) for ; Mon, 5 Nov 2012 12:12:37 -0500 Received: from S3SBS08SERVER.Systems3.local ([fe80::6077:364b:fa39:c71b]) by S3SBS08SERVER.Systems3.local ([fe80::6077:364b:fa39:c71b%10]) with mapi; Mon, 5 Nov 2012 10:12:30 -0700 From: Craig Berland X-Original-To: Lancair Mailing List X-Original-Date: Mon, 5 Nov 2012 10:12:29 -0700 Subject: [LML] Oil going overboard Thread-Topic: [LML] Oil going overboard Thread-Index: Ac27dDex6DPG9+noRri1m8xkvgt3PwAAj4Kw X-Original-Message-ID: References: In-Reply-To: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: acceptlanguage: en-US Content-Type: multipart/alternative; boundary="_000_D7A6B5700A0803448C27264F1F5387368099C919A9S3SBS08SERVER_" MIME-Version: 1.0 X-ExchangeDefender-Info: Please contact the ISP for more information X-ExchangeDefender-VirusScan: Found to be clean X-ExchangeDefender-From: cberland@systems3.net X-ExchangeDefender-MagicKey: 1353345159.95945@BcXlH0bP7vBbC1MwJdljUA X-Spam-Status: No --_000_D7A6B5700A0803448C27264F1F5387368099C919A9S3SBS08SERVER_ Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable "I checked my crank pressure by hooking a pressure gauge to the breather (b= efore 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 pi= ston rings and you will continue to build pressure until something breaks. = You must let your engine crankcase "breath". The test you wanted to do wa= s 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 sep= arator 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 I am flying a Lancair Legacy with an IO-550 10:1 compression - Performance= engine that has been inspected and rebuilt about 60 hrs ago. I have had a problem, which I attributed to new cylinder/rings, with excessive oil consumption. Initially I was using about a qt an hour a= nd this improved at about 15 hrs. Seemed like normal break in. Then one flight back from the coast of OR (Sea Level - I fly out of Bend = - 3500 ft), I started losing oil pressure. When I landed after the hour fl= ight I had about 5 qts left. I started with 9. I attributed it to a crazy= idea I had to hook the breather tube into the exhaust. I was getting real= ly tired of cleaning the bottom of the plane and my hangar floor. I disconnected it and flew and problem solved. Just recently on a trip back East the same thing happened. Got to Rawlings, Wy 8.5 qts running grat no problems. Next stop about 1.5 hrs, 2 added qts. On my way to Kansas City oil pressure dropping slowl= y so I diverted and now I was down to 4-5 qts. After spending the night in= Kansas city and buying a case of oil, I flew back to Bend. Used 1/2 qt in= 6 hrs. So a few things. I have a 12 qt oil pan, I have an air/oil separator, I ch= ecked my crank pressure by hooking a pressure gauge to the breather (before= the separator) and it is high somewhere in the 4-5 psi. I did a compressi= on check and. OK so why intermittently dumping from the oil breather? --_000_D7A6B5700A0803448C27264F1F5387368099C919A9S3SBS08SERVER_ Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

"I checked my crank pressure by hooking a pressure gau= ge 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 g= asket.  All engines have blow-= by or combustion gases that get by the piston rings and you will continue t= o build pressure until something breaks.&n= bsp; You must let your engine crankcase “breath”.  The test you wanted to do was a blo= w-by “flow” test.  I am NOT a IO-550 expert but I would guess .5 CFM at idle and 2-3 CFM at c= ruise would be normal.  I beli= eve your air/oil separator inlet should be located higher than the engine f= ill tube vent outlet.  Maybe t= hat is causing your problem.  = Since the problem is intermittent, I would rule out piston rings.

Craig Ber= land

N7VG

 

 

I am = flying a Lancair Legacy with an IO-550&nbs= p; 10:1 compression - Performance engine that has been inspected and= rebuilt about 60 hrs

ago.   I have had a problem, which I att= ributed to new cylinder/rings,

with e= xcessive oil consumption.  Ini= tially I was using about a qt an hour and this improved at about 15 hrs.  Seemed like normal break in.

Then one flight back from the  coast of OR (Sea Level - I fly out of = Bend  - 3500 ft), I started lo= sing oil pressure.  When I lan= ded after the hour flight I had about 5 qts left.  I started with 9.&nbs= p; I attributed it to a crazy idea I had to hook the breather tube i= nto the exhaust.  I was gettin= g really tired of cleaning the bottom of the

plane and my hangar floor. &n= bsp; I disconnected it and flew and problem

solved.  Just = recently on a trip back East the same thing happened.

Got to Rawlings, Wy 8.5 qts running grat no problems.  Next stop about

1.5 hrs, 2 added qts.=   On my way to Kansas City oil pressure dropping slowly so I di= verted and now I was down to 4-5 qts. = ; After spending the night in Kansas city and buying a case of oil, = I flew back to Bend.  Used 1/2= qt in 6 hrs.

 

So a few things.&nbs= p; I have a 12 qt oil pan, I have an air/oil separator, I checked my= crank pressure by hooking a pressure gauge to the breather (before the sep= arator) and it is high somewhere in the 4-5 psi.  I did a compression check and.

 

OK so why inte= rmittently dumping from the oil breather?



--_000_D7A6B5700A0803448C27264F1F5387368099C919A9S3SBS08SERVER_--