Return-Path: Received: from [24.25.9.101] (HELO ms-smtp-02-eri0.southeast.rr.com) by logan.com (CommuniGate Pro SMTP 4.2.8) with ESMTP id 622809 for flyrotary@lancaironline.net; Wed, 26 Jan 2005 08:22:50 -0500 Received-SPF: none receiver=logan.com; client-ip=24.25.9.101; envelope-from=eanderson@carolina.rr.com Received: from edward2 (cpe-024-074-185-127.carolina.rr.com [24.74.185.127]) by ms-smtp-02-eri0.southeast.rr.com (8.12.10/8.12.7) with SMTP id j0QDMF4S024334 for ; Wed, 26 Jan 2005 08:22:16 -0500 (EST) Message-ID: <002001c503aa$0dffaab0$2402a8c0@edward2> From: "Ed Anderson" To: "Rotary motors in aircraft" References: Subject: 2 cycle oil in Sump was Re: [FlyRotary] Re: oil analysis results Date: Wed, 26 Jan 2005 08:22:16 -0500 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_001D_01C50380.24FC5120" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2800.1106 X-MIMEOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 X-Virus-Scanned: Symantec AntiVirus Scan Engine This is a multi-part message in MIME format. ------=_NextPart_000_001D_01C50380.24FC5120 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable MessageBased on the experience of Finn, Tracy and myself, there is no = doubt that unburnt 2 cycle oil does (at least for us) migrate to the = sump with pre-mix. Apparently a small amount of the 2 cycle oil in the = fuel is deposited on the metal surfaces including the sides of the = combustion chamber. As the rotor oscillates its seals apparently sweeps = some of this oil into the center housing to mix with the cooling sump = oil dumped there and then flows to the sump. The rate of 2 cycle oil build up seems dependent upon the ratio of the = mixture. I find that mixing 1 oz per gallon, I will have approx 1/2 cup = of additional oil in the sump after 10-15 hours. If I reduce the oil to = 3/4 oz per gallon, it seems to reduce it to practically nothing. The first time Tracy told me his engine was making oil, I would have = been very skeptical (had it been anyone other than Tracy). Then I begin = noticing that after a period of time my oil level would be up to the = drain level of my PSRU return, so I would drain 1/2 cup or so. FWIW Ed A ----- Original Message -----=20 From: Bob Perkinson=20 To: Rotary motors in aircraft=20 Sent: Wednesday, January 26, 2005 2:12 AM Subject: [FlyRotary] Re: oil analysis results =20 =20 a portion of the fuel/air mixture is pushed into the crankcase (for = lack of a better term). =20 Finn made a statement a few weeks back that he had to drain oil from = his sump because of the fuel that had gotten past the side seals. And = he's flying. =20 Bob Perkinson =20 ------=_NextPart_000_001D_01C50380.24FC5120 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Message
Based on the experience of Finn, Tracy = and myself,=20 there is no doubt that unburnt 2 cycle oil does (at least for = us) migrate=20 to the sump with pre-mix.  Apparently a small amount of the 2 cycle = oil in=20 the fuel is deposited on the metal surfaces including the sides of the=20 combustion chamber.  As the rotor oscillates its = seals apparently=20 sweeps some of this oil into the center housing to mix with the cooling = sump oil=20 dumped there and then flows to the sump.
 
The rate of 2 cycle oil build up seems = dependent=20 upon the ratio of the mixture.  I find that mixing 1 oz per gallon, = I will have approx 1/2 cup of additional oil in the sump after = 10-15=20 hours.  If I reduce the oil to 3/4 oz per gallon, it seems to = reduce it to=20 practically nothing.
 
The first time Tracy told me his engine = was making=20 oil, I would have been very skeptical (had it been anyone other than=20 Tracy).  Then I begin noticing that after a period of time my oil = level=20 would be up to the drain level of my PSRU return, so I would drain 1/2 = cup or=20 so.
 
FWIW
 
Ed A
 
 
----- Original Message -----
From:=20 Bob=20 Perkinson
Sent: Wednesday, January 26, = 2005 2:12=20 AM
Subject: [FlyRotary] Re: oil = analysis=20 results

 

 

a portion=20 of the fuel/air mixture is pushed into the crankcase (for lack of = a=20 better term).

 

Finn made a = statement a few=20 weeks back that he had to drain oil from his sump because of the fuel = that had=20 gotten past the side seals.  = And=20 he=92s flying.

 

Bob=20 Perkinson

 

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