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 1023391 for flyrotary@lancaironline.net; Mon, 27 Jun 2005 12:57:02 -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 AABBNAM7EAKER3XS for (sender ); Mon, 27 Jun 2005 09:56:04 -0700 (PDT) X-UNTD-OriginStamp: Y+Mfppm2QyGfnY/dq+iW1TvwP45RV1XrklfMFbLVX4+vlIbxHBY+3w== Received: (from jbker@juno.com) by m15.nyc.untd.com (jqueuemail) id KWH2N65X; Mon, 27 Jun 2005 09:55:51 PDT To: flyrotary@lancaironline.net Date: Mon, 27 Jun 2005 12:51:35 -0400 Subject: Re: [FlyRotary] Re: Coolant Leak Message-ID: <20050627.125423.836.20.JBKER@juno.com> X-Mailer: Juno 5.0.33 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary=--__JNP_000_5e94.476c.75e3 X-Juno-Line-Breaks: 8-6,7-8,10-14,16-17,19-30,32-34,41-45,48-52,54,62-63,64-32767 From: WALTER B KERR X-ContentStamp: 9:4:4227610345 X-MAIL-INFO:121941e969490d3011614db18d00898d31e15179f5899170cd7995a1d42d04b43d1d3499ddd579d5846914b0d0f9a1d4c5c4c444f4b93471556d1901703d94858490e48101606510c080c991e4f0bd1560d9546969e025292179d9d900 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_5e94.476c.75e3 Content-Type: text/plain; charset=iso-8859-1 Content-Transfer-Encoding: 8bit Hi Georges, I agree that my system is not adequate for sustained WOT operation at low altitudes. Bernie On Mon, 27 Jun 2005 09:30:54 -0700 (Pacific Standard Time) "Echo Lake Fishing Resort (Georges Boucher)" writes: Bernie 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. Georges B. -------Original Message------- From: Rotary motors in aircraft Date: 06/27/05 09:02:09 To: Rotary motors in aircraft Subject: [FlyRotary] Re: Coolant Leak 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_5e94.476c.75e3 Content-Type: text/html; charset=iso-8859-1 Content-Transfer-Encoding: quoted-printable

Hi Georges, I agree that my system is not adequate for sustained WOT=20 operation at low altitudes.

Bernie

On Mon, 27 Jun 2005 09:30:54 -0700 (Pacific Standard Time) "Echo Lake= =20 Fishing Resort (Georges Boucher)" <echolakeresort@telus.net>=20 writes:

Bernie

IMO if everything is normal at other than WOT your = coolant=20 temp must be rising as well, your cooling system is inadequate = ;for=20 constant WOT.

Georges B.

-------Original=20 Message-------

From: Rotary motors in=20 aircraft

Date: 06/27/= 05=20 09:02:09

To: Rotary motors in=20 aircraft

Subject: [= FlyRotary]=20 Re: Coolant Leak

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=20 swirl pot, but I thought that it was decided some time back that = higher=20 pressures were better than lower pressures. The higher = pressures=20 are supposed provide more margin of safety before a boil-over = occurs,=20 permitting a thinner ethylene-glycol solution and enabling the = engine to=20 tolerate higher temps before experiencing catastrophic boiling.&= nbsp;=20 So, I=92m wondering where this leaves us. Is it better to run= at low=20 (7-8 psi) pressures, or high (28-30psi) pressures? =20

Mark S.= =20

I agree, Al, = inquiring=20 minds at least like a plausible hypothesis and I think the = discussion=20 has led to that. Perhaps I'll leave the "cup" of air, just = for=20 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=20 boiling temp, but conversely more apt to leak.

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

Bernie

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