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X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: <13brv3@bellsouth.net> Received: from imf22aec.mail.bellsouth.net ([205.152.59.70] verified) by logan.com (CommuniGate Pro SMTP 5.0c2) with ESMTP id 731952 for flyrotary@lancaironline.net; Sat, 24 Sep 2005 15:10:24 -0400 Received-SPF: pass receiver=logan.com; client-ip=205.152.59.70; envelope-from=13brv3@bellsouth.net Received: from ibm67aec.bellsouth.net ([65.6.194.9]) by imf22aec.mail.bellsouth.net with ESMTP id <20050924190940.PMEK3196.imf22aec.mail.bellsouth.net@ibm67aec.bellsouth.net> for ; Sat, 24 Sep 2005 15:09:40 -0400 Received: from rd ([65.6.194.9]) by ibm67aec.bellsouth.net with ESMTP id <20050924190939.FOCF19803.ibm67aec.bellsouth.net@rd> for ; Sat, 24 Sep 2005 15:09:39 -0400 From: "Russell Duffy" <13brv3@bellsouth.net> To: "'Rotary motors in aircraft'" Subject: RE: [FlyRotary] pressure in the crank-case Date: Sat, 24 Sep 2005 14:09:37 -0500 Message-ID: <000001c5c13b$83ff6030$6101a8c0@rd> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0001_01C5C111.9B2BA220" X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook, Build 10.0.6626 Importance: Normal In-Reply-To: X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.2527 This is a multi-part message in MIME format. ------=_NextPart_000_0001_01C5C111.9B2BA220 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Hi Dave,=20 =20 Sorry to hear of the odd problem.=20 =20 So I fix the oil filler stem but on a ground run there is now oil coming = out of the turbo.=20 =20 When you say coming out of the turbo, where exactly is it coming out? = The exhaust? The turbo housing? =20 =20 If I take the oil filler cap off, oil stops coming out of the turbo. So something is pressurizing the crank-case. Engine is running fine = otherwise. The crank case vent is not plugged (but is too small to let out large amounts of gas). The oil does not appear to have water in it, so it = seems to be either compression or exhaust gas that is getting in.=20 =20 What causes that? A blown side seal? =20 =20 That's all I can think of. When you leave the oil cap off, and rev the engine, do you get a lot of oil fog out of the filler opening? If so, = I'd say the side seals, or corner seals are history. =20 =20 Have you been running the snot out of the engine recently? High RPM and boost? Are you absolutely sure you haven't lost oil pressure, or = severely overheated the oil recently? =20 =20 You really do seem to be finding the failure modes for everyone else. = Good luck. =20 Cheers, Rusty (Slingshot likely to be HKS powered, shopping for new project for = the single rotor) ------=_NextPart_000_0001_01C5C111.9B2BA220 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Message

Hi Dave,=20

Sorry to hear=20 of the odd problem.

So I fix the oil filler stem but on a ground run there is now oil = coming=20 out of the turbo.

When=20 you say coming out of the turbo, where exactly is it coming = out? The=20 exhaust? The turbo housing?

If I take the oil filler cap off, oil stops coming out of the = turbo. =20 So something is pressurizing the crank-case. Engine is running = fine=20 otherwise. The crank case vent is not plugged (but is too small to = let out=20 large amounts of gas). The oil does not appear to have water in = it, so it=20 seems to be either compression or exhaust gas that is getting in.

What causes that? A blown side seal?

That's all I=20 can think of. When you leave the oil cap off, and rev the engine, = do you=20 get a lot of oil fog out of the filler opening? If so, I'd say the side seals, = or corner seals=20 are history.

Have you been=20 running the snot out of the engine recently? High RPM and=20 boost? Are you absolutely sure you haven't lost oil = pressure,=20 or severely overheated the oil recently?

You really do=20 seem to be finding the failure modes for everyone else. Good=20 luck.

Cheers,

Rusty=20 (Slingshot likely to be HKS powered, shopping for new project for the = single=20 rotor)

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