X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from m15.nyc.untd.com ([64.136.22.78] verified) by logan.com (CommuniGate Pro SMTP 4.3.5) with SMTP id 1023336 for flyrotary@lancaironline.net; Mon, 27 Jun 2005 12:02:09 -0400 Received-SPF: pass receiver=logan.com; client-ip=64.136.22.78; envelope-from=jbker@juno.com Received: from m15.nyc.untd.com (localhost [127.0.0.1]) by m15.nyc.untd.com with SMTP id AABBNAJYFAUVH3KS for (sender ); Mon, 27 Jun 2005 09:01:09 -0700 (PDT) X-UNTD-OriginStamp: Y+Mfppm2QyGfnY/dq+iW1dI7NeC5DkXkKKY9njgV2F+l4jvFXJy1VQ== Received: (from jbker@juno.com) by m15.nyc.untd.com (jqueuemail) id KWHXH4L5; Mon, 27 Jun 2005 09:00:39 PDT To: flyrotary@lancaironline.net Date: Mon, 27 Jun 2005 11:47:17 -0400 Subject: Re: [FlyRotary] Re: Coolant Leak Message-ID: <20050627.115916.836.12.JBKER@juno.com> X-Mailer: Juno 5.0.33 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary=--__JNP_000_0511.2702.7238 X-Juno-Line-Breaks: 8-6,7-8,10-12,19-23,26-30,32,40-41,42-32767 From: WALTER B KERR X-ContentStamp: 25:12:4147662458 X-MAIL-INFO:04cdedbccd05753128bc0528a8cc49a5f9f5e1ddd13c2cbdd8998138581d4cf82c758585f159a908fcf90581f57ce8a918b911d9a8bc457c4861c81898ccc1c1dd69956819989815 X-UNTD-Peer-Info: 127.0.0.1|localhost|m15.nyc.untd.com|jbker@juno.com This message is in MIME format. Since your mail reader does not understand this format, some or all of this message may not be legible. ----__JNP_000_0511.2702.7238 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 8bit On Mon, 27 Jun 2005 09:07:24 -0500 "Mark R Steitle" writes: 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 =========================================== 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 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. Bernie ----__JNP_000_0511.2702.7238 Content-Type: text/html; charset=us-ascii Content-Transfer-Encoding: quoted-printable

On Mon, 27 Jun 2005 09:07:24 -0500 "Mark R Steitle" <mark.steitle@austin.utexas.= edu>=20 writes:

Ed,=20

Not to stir = the swirl=20 pot, but I thought that it was decided some time back that higher = pressures=20 were better than lower pressures. The higher pressures are supposed= =20 provide more margin of safety before a boil-over occurs, permitting a = thinner=20 ethylene-glycol solution and enabling the engine to tolerate higher temps= =20 before experiencing catastrophic boiling. So, I’m wondering = where this=20 leaves us. Is it better to run at low (7-8 psi) pressures, or high= =20 (28-30psi) pressures?

Mark S.=20

I agree, Al, inquiring = minds=20 at least like a plausible hypothesis and I think the discussion has led = to=20 that. Perhaps I'll leave the "cup" of air, just for peace of mind=20 {:>)

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= =20 temp, but conversely more apt to leak.

My volvo reservoir shows a max cool liquid level which leaves some = air.=20 Interesting my pressures look nothing like everyone else's. Where is = everyone=20 measuring the pressure. My sensor is connected to the small stem by the = return=20 inlet from radiator. I assumed this is one of the lowest pressures in the= =20 system. If I climb WOT, the pressure continues to climb steadily to 24 = psi=20 indicated and if the throttle is not reduced, coolant will be dumped by = the=20 cap. At 5500 rpm cruise, the pressure runs in the teens.

Bernie

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