Return-Path: Sender: (Marvin Kaye) To: flyrotary Date: Wed, 28 May 2003 18:57:09 -0400 Message-ID: X-Original-Return-Path: Received: from BAY0-SMTP09.adinternal.hotmail.com ([65.54.241.116] verified) by logan.com (CommuniGate Pro SMTP 4.1b6) with ESMTP id 2366013 for flyrotary@lancaironline.net; Wed, 28 May 2003 10:16:50 -0400 X-Originating-IP: [68.7.218.110] X-Originating-Email: [alventures@msn.com] Received: from BigAl ([68.7.218.110]) by BAY0-SMTP09.adinternal.hotmail.com with Microsoft SMTPSVC(5.0.2195.5600); Wed, 28 May 2003 07:16:11 -0700 Reply-To: From: "Al Gietzen" X-Original-To: "'Rotary motors in aircraft'" Subject: RE: [FlyRotary] Re: oil return location? X-Original-Date: Wed, 28 May 2003 07:16:25 -0700 Organization: ALVentures X-Original-Message-ID: <000c01c32523$bcb72c70$6400a8c0@BigAl> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_000D_01C324E9.10585470" X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook, Build 10.0.4024 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 Importance: Normal In-Reply-To: X-Original-Return-Path: alventures@email.msn.com X-OriginalArrivalTime: 28 May 2003 14:16:11.0921 (UTC) FILETIME=[B0F19010:01C32523] This is a multi-part message in MIME format. ------=_NextPart_000_000D_01C324E9.10585470 Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: 7bit Tracy should confirm this but I think you want your oil return to enter the pan above the oil level in the pan. Otherwise you risk oil backing up in the redrive. You also risk pressurizing the drive and possibly blowing a seal. I know in turbo installs this is true and a return line into the pan below oil level is a definite no-no. I'll let Tracy speak up if he thinks this will be a problem. I just can't see it as an issue with the redrive. It's still a gravity feed, and there isn't any pressure. As I see it, the only issue with returning the oil below the oil level in the pan is if it is possible (or likely) that an air bubble gets trapped in the drain line between the drive and the oil level. Doesn't seem likely with a 3/8" drain line considering the small orifice in the feed line, but perhaps we can't rule out that there may be conditions where it could happen. Al ------=_NextPart_000_000D_01C324E9.10585470 Content-Type: text/html; charset="US-ASCII" Content-Transfer-Encoding: quoted-printable

 

 Tracy should confirm this = but I think you want your oil return to enter the pan above the oil level in = the pan. Otherwise you risk oil backing up in the redrive. You also risk = pressurizing the drive and possibly blowing a seal. I know in turbo installs this is = true and a return line into the pan below oil level is a definite no-no.

 

I’ll let Tracy speak up = if he thinks this will be a problem.  I just can’t see it as an = issue with the redrive.  It’s still a gravity feed, and there = isn’t any pressure.

 

As I see it, the only issue with returning the oil below the oil level in the pan is if it is possible = (or likely) that an air bubble gets trapped in the drain line between the = drive and the oil level.  Doesn’t seem likely with a 3/8” drain = line considering the small orifice in the feed line, but perhaps we = can’t rule out that there may be conditions where it could = happen.

 

Al

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