X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Sun, 15 Jul 2007 20:28:54 -0400 Message-ID: X-Original-Return-Path: Received: from mail.stoel.com ([198.36.178.142] verified) by logan.com (CommuniGate Pro SMTP 5.1.10) with SMTP id 2178985 for lml@lancaironline.net; Sun, 15 Jul 2007 12:57:59 -0400 Received-SPF: pass receiver=logan.com; client-ip=198.36.178.142; envelope-from=CSLEWIS@stoel.com Received: from gateway1.stoel.com ([198.36.178.141]) by mail.stoel.com (SMSSMTP 4.1.9.35) with SMTP id M2007071509571308965 for ; Sun, 15 Jul 2007 09:57:13 -0700 Received: from sea-mx1.stoel.com (unknown [172.17.103.4]) by gateway1.stoel.com (Firewall Mailer Daemon) with ESMTP id B7FCBAF056 for ; Sun, 15 Jul 2007 09:57:25 -0700 (PDT) X-MimeOLE: Produced By Microsoft Exchange V6.5 Content-class: urn:content-classes:message MIME-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Subject: RE: [LML] Re: oil seperator X-Original-Date: Sun, 15 Jul 2007 09:57:28 -0700 X-Original-Message-ID: X-MS-Has-Attach: X-MS-TNEF-Correlator: Thread-Topic: [LML] Re: oil seperator Thread-Index: AcfGc+ne3QlyPS8SQrSIlqhjX6E6ZAAjVA8/ References: From: "Lewis III, Charles S." X-Original-To: "Lancair Mailing List" Peter: =20 Do you mean to say that your normal oil pressure is 75 psi on an = IO-550N? =20 Carl Lewis Legacy N14CL =20 =20 ________________________________ From: Lancair Mailing List on behalf of PJHWFD@aol.com Sent: Sat 7/14/2007 5:03 PM To: lml@lancaironline.net Subject: [LML] Re: oil seperator Brad I have been going trough a lot of trouble shooting on my Legacy = IO-550exp related to oil blowby. I have the Andair separator. My = problems related to two issues. If you are blowing a lot of oil this = system can be overwhelmed and if it fills to the outlet port. You will = really start blowing oil because of back pressure. I originally plumbed = into the accessory case for the drain back oil with poor results on long = trips. Lancair recommended this but Continental, Airwolf, M20, Cirrus = all say the only low pressure place to return oil is the rocker valve = cover or push rod tube. The accessory case sees high crankcase = pressures and has oil spraying onto the port. I also tried a remote = collection cup sold by Andair which worked OK till it filled. I am now = plumbed into the rocker valve cover with good results but do not have = enough data on long flights to be sure. Many of these systems rely on = pressure from a vacuum pump to aid siphoning back to the crankcase. = Without that you have a little disadvantage and be sure there is good = gravity feed back to the engine. =20 Why am I loosing so much oil? I think oil levels play a very important = part in this and would like to hear from others on their opinion. I = originally ran at 6 quarts because the common wisdom was that anymore = and it would just get blown out the breather. I am worried that anything = less than 6 could cause cavitation and foaming in the oil pan and = accelerate the oil blowby problem. Cirrus specifically recommends not = letting the level drop below 6. Not a lot of fun watching oil pressures = drop from 75 to 50 and getting out of the plane and having the belly = smeared with oil. I am now running closer to 7 and hope this gives = better results. My oil temps run near 180 and have never gone above 200 except during = extended ground operation. I have the oil cooler door and tried removing = it because I never used it but my oil temps were to low in the winter. = Home base Vermont. Hope to visit with a lot of you at Oshkosh. =20 =20 Peter Hebert N23PH LEG2/G pjhwfd@aol.com ________________________________ Get a sneak peak of the all-new AOL.com = = .