X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from imo-m17.mx.aol.com ([64.12.138.207] verified) by logan.com (CommuniGate Pro SMTP 4.3.4) with ESMTP id 1004017 for flyrotary@lancaironline.net; Thu, 16 Jun 2005 10:54:30 -0400 Received-SPF: pass receiver=logan.com; client-ip=64.12.138.207; envelope-from=WRJJRS@aol.com Received: from WRJJRS@aol.com by imo-m17.mx.aol.com (mail_out_v38_r1.7.) id q.85.29c22287 (4539) for ; Thu, 16 Jun 2005 10:53:40 -0400 (EDT) From: WRJJRS@aol.com Message-ID: <85.29c22287.2fe2ec74@aol.com> Date: Thu, 16 Jun 2005 10:53:40 EDT Subject: Re: [FlyRotary] Re: turbo oil drain To: flyrotary@lancaironline.net MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="-----------------------------1118933620" X-Mailer: 9.0 SE for Windows sub 5012 -------------------------------1118933620 Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: 7bit In a message dated 6/16/2005 7:09:40 AM Pacific Standard Time, 13brv3@bellsouth.net writes: So does this mean the compressor side can have a seal, since it's not 1600 degrees? Would you almost always lose the oil out the exhaust, and not into the intake? If you lost it into the intake, it could affect the way the engine runs, but if it goes into the exhaust side, it will just blow out the pipe. Rusty, Not claiming to be an expert here, but as I understand it many of the water cooled turbos have seals on the intake. The problem again is the surface speed of the seal and the dilution of the lubrication if the turbo is "suck through" or put another way injection or carb upstream. On many difficult systems a labarynth seal is used. The labariinth seal is just close fitting ribs nearly in contact with the shaft. this works fairly well on the pressure side. The oil drain of the trubo needs to be low restriction for another reason as well. The oil leaving the turbo bearing (50,000+ RPM) is often wipped into a froth which can be very hard to move through a line. Think of it as trying to push wipped cream through the tube. The air spaces make it hard to push. Look at the TSIO-550 Continential turbos if you get a chance. They have a expansion and settling resevoir in line. It looks like a oblong box in line under the turbo. Best of luck with the project. Bill Jepson -------------------------------1118933620 Content-Type: text/html; charset="US-ASCII" Content-Transfer-Encoding: quoted-printable

In a message dated 6/16/2005 7:09:40 AM Pacific Standard Time,=20 13brv3@bellsouth.net writes:

<= FONT=20 style=3D"BACKGROUND-COLOR: transparent" face=3DArial color=3D#ff0000 size= =3D3>

So do= es this=20 mean the compressor side can have a seal, since it's not 1600 degrees?&nbs= p;=20 Would you almost always lose the oil out the exhaust, and not into the=20 intake? If you lost it into the intake, it could affect the way the=20 engine runs, but if it goes into the exhaust side, it will just blow out t= he=20 pipe.

Rusty,

Not claiming to be an expert here, but as I understand it many of= the=20 water cooled turbos have seals on the intake. The problem again is the surfa= ce=20 speed of the seal and the dilution of the lubrication if the turbo is "suck=20 through" or put another way injection or carb upstream. On many difficult=20 systems a labarynth seal is used. The labariinth seal is just close fitting=20= ribs=20 nearly in contact with the shaft. this works fairly well on the pressure=20 side. The oil drain of the trubo needs to be low restriction for anothe= r=20 reason as well. The oil leaving the turbo bearing (50,000+ RPM) is often wip= ped=20 into a froth which can be very hard to move through a line. Think of it as=20 trying to push wipped cream through the tube. The air spaces make it hard to= =20 push. Look at the TSIO-550 Continential turbos if you get a chance. Th= ey=20 have a expansion and settling resevoir in line. It looks like a oblong=20= box=20 in line under the turbo.

Best of luck with the project.

Bill Jepson

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