X-Virus-Scanned: clean according to Sophos on Logan.com X-SpamCatcher-Score: 10 [X] Return-Path: Received: from bay0-omc1-s25.bay0.hotmail.com ([65.54.246.97] verified) by logan.com (CommuniGate Pro SMTP 5.1.7) with ESMTP id 1927770 for flyrotary@lancaironline.net; Sun, 18 Mar 2007 11:42:27 -0400 Received-SPF: pass receiver=logan.com; client-ip=65.54.246.97; envelope-from=lors01@msn.com Received: from hotmail.com ([65.54.250.80]) by bay0-omc1-s25.bay0.hotmail.com with Microsoft SMTPSVC(6.0.3790.2668); Sun, 18 Mar 2007 08:41:37 -0700 Received: from mail pickup service by hotmail.com with Microsoft SMTPSVC; Sun, 18 Mar 2007 08:41:37 -0700 Message-ID: Received: from 4.171.150.96 by BAY115-DAV8.phx.gbl with DAV; Sun, 18 Mar 2007 15:41:36 +0000 X-Originating-IP: [4.171.150.96] X-Originating-Email: [lors01@msn.com] X-Sender: lors01@msn.com From: "Tracy Crook" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] Re: water boiling point Date: Sun, 18 Mar 2007 11:41:33 -0400 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0080_01C76952.608A2750" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: MSN 9 X-MimeOLE: Produced By MSN MimeOLE V9.50.0034.2000 Seal-Send-Time: Sun, 18 Mar 2007 11:41:33 -0400 X-OriginalArrivalTime: 18 Mar 2007 15:41:37.0579 (UTC) FILETIME=[EA4367B0:01C76973] Return-Path: lors01@msn.com This is a multi-part message in MIME format. ------=_NextPart_000_0080_01C76952.608A2750 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Re: [FlyRotary] water boiling pointHigher coolant pressure will = naturally increase the risk of a leak due to blown hose, loose clamp, = radiator tank failure, etc. As in many of these matters, it is the = builders choice as to which potential problem is most important. =20 BTW, I do recommend doing a system pressure test at annual inspection = time or after making any changes. I intentionally over-pressure the = system by 50% by hooking a regulated air pressure source to the overflow = port on the cap fitting. I could be wrong but the likelihood of a blown rotor housing coolant = seal from coolant pressure is very low. If coolant pressure causes them = to leak there was a problem that needed to be addressed long before the = leak happened. Most coolant seal leaks happen at the inner seal which = normally have to seal combustion chamber pressure. Even 30 psi coolant = pressure is a very tiny fraction of that. Tracy (still waiting on Bluemountain) ----- Original Message -----=20 From: Ken Welter=20 To: Rotary motors in aircraft=20 Sent: Sunday, March 18, 2007 8:21 AM Subject: [FlyRotary] Re: water boiling point My same thought, the higher pressure the better chance of leaks, for = the last 1400 hrs I have been running a 7 lb cap with no problem, I = normally run about 180 for water temp but do see 220 on a hard climb out = on a hot day and when at high altitude its usually so cold outside that = cooling is not an issue. Ken Welter =20 Thanks for your reply Tracy! I did a google search on water boiling point. Coolant should be = higher, but it seems that water boils at 183 degrees at 16,000 feet. But = that is with no added pressure. I could not find the corrected number = for the 12 psi cap. I wonder how many blown rotor housing seals are due to higher = coolant pressure ?=20 George Graham Sarasota Florida Mazda RX7 EZ -------------------------------------------------------------------------= --- It's here! Your new message! Get new email = alerts with the free Yahoo! Toolbar. ------=_NextPart_000_0080_01C76952.608A2750 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Re: [FlyRotary] water boiling point
Higher coolant pressure will naturally increase the risk of a leak = due to=20 blown hose, loose clamp, radiator tank failure, etc.  As in many of = these=20 matters, it is the builders choice as to which potential problem is most = important.  
 
BTW, I do recommend doing a system pressure test at = annual inspection=20 time or after making any changes.  I intentionally over-pressure = the system=20 by 50% by hooking a regulated air pressure source to the = overflow port on=20 the cap fitting.
 
I could be wrong but the likelihood of a blown rotor housing = coolant seal=20 from coolant pressure is very low.  If coolant pressure causes = them to=20 leak there was a problem that needed to be addressed long before the = leak=20 happened.  Most coolant seal leaks happen at the inner seal which = normally=20 have to seal combustion chamber pressure.  Even 30 psi coolant = pressure is a very tiny fraction of that.
 
Tracy  (still waiting on Bluemountain)
----- Original Message -----
From: Ken=20 Welter
To: Rotary motors in = aircraft
Sent: Sunday, March 18, 2007 = 8:21=20 AM
Subject: [FlyRotary] Re: water = boiling=20 point

  My same thought, the higher pressure the better chance of = leaks,=20 for the last 1400 hrs I have been running a 7 lb cap with no problem, = I=20 normally run about 180 for water temp but do see 220 on a hard climb = out on a=20 hot day and when at high altitude its usually so cold outside that = cooling is=20 not an issue.
 Ken Welter

 

Thanks for your reply = Tracy!

I did a=20 google search on water boiling point.  Coolant should be = higher,
but=20 it seems that water boils at 183 degrees at 16,000 feet. But = that
is with=20 no added pressure.  I could not find the corrected number for = the 12=20 psi cap.

I wonder how many blown rotor housing seals are due = to=20 higher coolant pressure ? 




George = Graham
Sarasota=20 Florida
Mazda RX7 EZ
 
It's here! Your new = message!
Get new=20 email alerts with the free Yahoo!=20 Toolbar.

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