X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from [199.185.220.223] (HELO priv-edtnes27.telusplanet.net) by logan.com (CommuniGate Pro SMTP 4.3.5) with ESMTP id 1023365 for flyrotary@lancaironline.net; Mon, 27 Jun 2005 12:31:55 -0400 Received-SPF: pass receiver=logan.com; client-ip=199.185.220.223; envelope-from=echolakeresort@telus.net Received: from boucher-oddle24 ([207.194.26.38]) by priv-edtnes27.telusplanet.net (InterMail vM.6.01.04.04 201-2131-118-104-20050224) with SMTP id <20050627163059.HNUY13826.priv-edtnes27.telusplanet.net@boucher-oddle24> for ; Mon, 27 Jun 2005 10:30:59 -0600 MIME-Version: 1.0 Message-Id: <42C029BE.00000D.03336@BOUCHER-ODDLE24> Date: Mon, 27 Jun 2005 09:30:54 -0700 (Pacific Standard Time) Content-Type: Multipart/Alternative; boundary="------------Boundary-00=_IJ4R24L0000000000000" X-Mailer: IncrediMail (3001609) From: "Echo Lake Fishing Resort (Georges Boucher)" References: To: Subject: Re: [FlyRotary] Re: Coolant Leak X-FID: FLAVOR00-NONE-0000-0000-000000000000 X-Priority: 3 --------------Boundary-00=_IJ4R24L0000000000000 Content-Type: Text/Plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Bernie=0D IMO if everything is normal at other than WOT your coolant temp must be rising as well, your cooling system is inadequate for constant WOT.=0D Georges B. =0D =0D -------Original Message-------=0D =0D From: Rotary motors in aircraft=0D Date: 06/27/05 09:02:09=0D To: Rotary motors in aircraft=0D Subject: [FlyRotary] Re: Coolant Leak=0D =0D =0D =0D On Mon, 27 Jun 2005 09:07:24 -0500 "Mark R Steitle" writes:=0D =0D Ed, =0D Not to stir the swirl pot, but I thought that it was decided some time ba= ck 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.= =20 So, I=92m wondering where this leaves us. Is it better to run at low (7-= 8 psi) pressures, or high (28-30psi) pressures? =0D =0D Mark S. =0D =0D =0D 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 ai= r, just for peace of mind {:>) =0D =0D Ed=0D =0D =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=0D I thought higher pressures were good also because the higher boiling temp= , but conversely more apt to leak.=0D My volvo reservoir shows a max cool liquid level which leaves some air. Interesting my pressures look nothing like everyone else's. Where is everyone measuring the pressure. My sensor is connected to the small stem= by the return inlet from radiator. I assumed this is one of the lowest pressures in the system. If I climb WOT, the pressure continues to climb steadily to 24 psi indicated and if the throttle is not reduced, coolant will be dumped by the cap. At 5500 rpm cruise, the pressure runs in the teens.=0D =0D Bernie=0D =0D =0D =0D =20 --------------Boundary-00=_IJ4R24L0000000000000 Content-Type: Text/HTML; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
Bernie
IMO if everything is normal at other than WOT your coolant temp= must be rising as well, your cooling system is inadequate for const= ant WOT.
Georges B. 
 
-------Original Message-------
 
Date: 06/27/05 09:= 02:09
Subject: [FlyRotar= y] Re: Coolant Leak
 
 
 
On Mon, 27 Jun 2005 09:07:24 -0500 "Mark R Steitle" <mark.steitle@austin.utexas.edu&= gt; writes:

 

Ed,

Not to stir the swi= rl pot, but I thought that it was decided some time back that higher pres= sures were better than lower pressures.  The higher pressures are su= pposed provide more margin of safety before a boil-over occurs, permittin= g a thinner ethylene-glycol solution and enabling the engine to tolerate = higher temps before experiencing catastrophic boiling.  So, I=92m wo= ndering where this leaves us.  Is it better to run at low (7-8 psi) = pressures, or high (28-30psi) pressures?  <= /P>

 

Mark S. =

 


I agree, Al, inquiring minds at least lik= e 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

 
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
I thought higher pressures were good also because the higher boiling= temp, but conversely more apt to leak.
My volvo reservoir shows a max cool liquid level which leaves some a= ir. Interesting my pressures look nothing like everyone else's. Where is = everyone measuring the pressure. My sensor is connected to the small stem= by the return inlet from radiator. I assumed this is one of the lowest p= ressures in the system. If I climb WOT, the pressure continues to climb s= teadily to 24 psi indicated and if the throttle is not reduced, coolant w= ill be dumped by the cap. At 5500 rpm cruise, the pressure runs in the te= ens.
 
Bernie
 
 
 
 
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