X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from [129.116.87.143] (HELO MAIL01.austin.utexas.edu) by logan.com (CommuniGate Pro SMTP 4.3.5) with ESMTP id 1023087 for flyrotary@lancaironline.net; Mon, 27 Jun 2005 10:08:11 -0400 Received-SPF: none receiver=logan.com; client-ip=129.116.87.143; envelope-from=mark.steitle@austin.utexas.edu X-MimeOLE: Produced By Microsoft Exchange V6.5.7226.0 Content-class: urn:content-classes:message MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----_=_NextPart_001_01C57B21.8B08650B" Subject: RE: [FlyRotary] Re: Coolant Leak Date: Mon, 27 Jun 2005 09:07:24 -0500 Message-ID: <87DBA06C9A5CB84B80439BA09D86E69E016C1A9B@MAIL01.austin.utexas.edu> X-MS-Has-Attach: X-MS-TNEF-Correlator: Thread-Topic: [FlyRotary] Re: Coolant Leak Thread-Index: AcV6mwob6MPOjuWNSrOATRxFUMfsDwAhVeYw From: "Mark R Steitle" To: "Rotary motors in aircraft" This is a multi-part message in MIME format. ------_=_NextPart_001_01C57B21.8B08650B Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable =20 Ed,=20 Not to stir the swirl pot, but I thought that it was decided some time back that higher pressures were better than lower pressures. The higher pressures are supposed provide more margin of safety before a boil-over occurs, permitting a thinner ethylene-glycol solution and enabling the engine to tolerate higher temps before experiencing catastrophic boiling. So, I'm wondering where this leaves us. Is it better to run at low (7-8 psi) pressures, or high (28-30psi) pressures? =20 =20 Mark S.=20 =20 I agree, Al, inquiring minds at least like a plausible hypothesis and I think the discussion has led to that. Perhaps I'll leave the "cup" of air, just for peace of mind {:>)=20 Ed ------_=_NextPart_001_01C57B21.8B08650B Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

 

Ed,

Not to stir the swirl pot, but I = thought that it was decided some time back that higher pressures were better than = lower pressures.  The higher pressures are supposed provide more margin = of safety before a boil-over occurs, permitting a thinner ethylene-glycol solution = and enabling the engine to tolerate higher temps before experiencing = catastrophic boiling.  So, I’m wondering where this leaves us.  Is it better to run = at low (7-8 psi) pressures, or high (28-30psi) pressures?  =

 

Mark S. =

 


I agree, Al, inquiring minds at least like a plausible hypothesis and I = think the discussion has led to that.  Perhaps I'll leave the = "cup" of air, just for peace of mind {:>)

Ed

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