X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from imo-m18.mx.aol.com ([64.12.138.208] verified) by logan.com (CommuniGate Pro SMTP 5.1c.2) with ESMTP id 1315626 for flyrotary@lancaironline.net; Tue, 25 Jul 2006 16:01:02 -0400 Received-SPF: pass receiver=logan.com; client-ip=64.12.138.208; envelope-from=Lehanover@aol.com Received: from Lehanover@aol.com by imo-m18.mx.aol.com (mail_out_v38_r7.5.) id q.527.476b143 (14502) for ; Tue, 25 Jul 2006 16:00:07 -0400 (EDT) From: Lehanover@aol.com Message-ID: <527.476b143.31f7d247@aol.com> Date: Tue, 25 Jul 2006 16:00:07 EDT Subject: Re: [FlyRotary] Re: Cooling coupling To: flyrotary@lancaironline.net MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="-----------------------------1153857607" X-Mailer: 9.0 Security Edition for Windows sub 5319 X-Spam-Flag: NO -------------------------------1153857607 Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: 7bit In a message dated 7/25/2006 12:45:16 P.M. Eastern Daylight Time, ALVentures@cox.net writes: Lynn; I understand that we can abuse the oil a bit, and out-of-control coolant temp is a disaster. The question this raises is the oil temp limit not being the oil, but the risk to the side seals of oil temps over about 220F for more than very short period. Early oil scraper seal failure is the long term problem. In the short term, oil in the wedge on the bearing face is at a much higher temperature than what the oil temp gage is reporting. So rotor bearing failure is closer. Also the oil is indicative of rotor face temperatures and in a turbo installation that means running closer to detonation charge temperatures. Our engine builder (Daryl Drummond) advises that oil temps above 160 degrees are cutting into engine power. But in a NA engine detonation is not as big a problem. Lynn E. Hanover -------------------------------1153857607 Content-Type: text/html; charset="US-ASCII" Content-Transfer-Encoding: quoted-printable

In a message dated 7/25/2006 12:45:16 P.M. Eastern Daylight Time,=20 ALVentures@cox.net writes:

<= FONT=20 style=3D"BACKGROUND-COLOR: transparent" face=3DVerdana color=3D#0000ff siz= e=3D2>

Lynn;

I understand=20= that=20 we can abuse the oil a bit, and out-of-control coolant temp is a disaster.= =20 The question this raises is the oil temp limit not being the oil, bu= t=20 the risk to the side seals of oil temps over about 220F for more than very= =20 short period.

Early oil scraper seal failure is the long=20= term=20 problem. In the short term, oil in the wedge on the bearing face is at a muc= h=20 higher temperature than what the oil temp gage is reporting.

So rotor bearing failure is closer. Also th= e oil is=20 indicative of rotor face temperatures and in a turbo installation that means= =20 running closer to detonation charge temperatures. Our engine builder (Daryl=20 Drummond) advises that oil temps above 160 degrees are cutting into engine power. But in a NA engine detonati= on is=20 not as big a problem.

<= FONT=20 style=3D"BACKGROUND-COLOR: transparent" face=3DVerdana color=3D#0000ff>

Lynn E.=20 Hanover

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