X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from EXHUB003-3.exch003intermedia.net ([207.5.74.110] verified) by logan.com (CommuniGate Pro SMTP 5.2.16) with ESMTPS id 3876694 for flyrotary@lancaironline.net; Tue, 06 Oct 2009 15:44:41 -0400 Received-SPF: none receiver=logan.com; client-ip=207.5.74.110; envelope-from=jwhaley@datacast.com Received: from EXVMBX003-5.exch003intermedia.net ([207.5.74.45]) by EXHUB003-3.exch003intermedia.net ([207.5.74.110]) with mapi; Tue, 6 Oct 2009 12:44:03 -0700 From: Jeff Whaley To: 'Rotary motors in aircraft' Date: Tue, 6 Oct 2009 12:44:55 -0700 Subject: Re: Seepage, no more. Oil system Thread-Topic: Re: Seepage, no more. Oil system Thread-Index: AcpGvXrdluCjwlBWQRSa+ZMd8YxvWA== Message-ID: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: acceptlanguage: en-US Content-Type: multipart/alternative; boundary="_000_C03ABB0A7362B84BB53D544B3C305E0E0153652EA3DDEXVMBX0035e_" MIME-Version: 1.0 --_000_C03ABB0A7362B84BB53D544B3C305E0E0153652EA3DDEXVMBX0035e_ Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Hi Lynn, with regards to your high-lighted comment about the check balls in= the crank - that is one item Bruce Turrentine suggested be removed in an o= verhaul for aircraft applications, replacing the balls with a carburetor je= t to allow oil flow right away and continuously. So, I did install carburet= or jets in my e-shaft during rebuild. Any comments? Anybody else out there = do the same thing? Just curious as I'm fighting high oil temps. Jeff Plus, the rotary is cold blooded. The big bearings stress the oil film to n= o great extent, and the major source of oil temperature is rotor cooling. A= t low speeds and idle, the check balls in the crank don't even open to allo= w cooling oil to spray into the engine. Those balls operate as a function o= f RPM not temperature. On the other hand, you will get a water temperature increase within one min= ute of startup. A water based coolant has very low viscosity and flow to a = distant heat exchanger will be immediate. Like the rear heater in my school= bus. Lynn E. Hanover --_000_C03ABB0A7362B84BB53D544B3C305E0E0153652EA3DDEXVMBX0035e_ Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Hi Lynn, with regards to your high-lighted comment about the= check balls in the crank – that is one item Bruce Turrentine suggested be removed in an overhaul for aircraft applications, replacing the balls with = a carburetor jet to allow oil flow right away and continuously. So, I did ins= tall carburetor jets in my e-shaft during rebuild. Any comments? Anybody else ou= t there do the same thing?  Just curious as I’m fighting high oil temps.

Jeff

 

Plus, the rotary is cold blooded. T= he big bearings stress the oil film to no great extent, and the major source o= f oil temperature is rotor cooling. At low speeds and idle, the check balls i= n the crank don't even open to allow cooling oil to spray into the engine. Th= ose balls operate as a function of RPM not temperature. 

 

On the other hand, you will get a water temperature increase within one minute= of startup. A water based coolant has very low viscosity and flow to a di= stant heat exchanger will be immediate. Like the rear heater in my school bus.

 

Lynn E. Hanover

 

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