X-Virus-Scanned: clean according to Sophos on Logan.com X-SpamCatcher-Score: 73 [XX] (100%) HEADERS: mail has MS Outlook properties but missing "Outlook" in "X-Mailer" Headers Return-Path: Received: from bay0-omc1-s7.bay0.hotmail.com ([65.54.246.79] verified) by logan.com (CommuniGate Pro SMTP 5.1.7) with ESMTP id 1926409 for flyrotary@lancaironline.net; Sat, 17 Mar 2007 11:51:50 -0400 Received-SPF: pass receiver=logan.com; client-ip=65.54.246.79; envelope-from=lors01@msn.com Received: from hotmail.com ([65.54.250.77]) by bay0-omc1-s7.bay0.hotmail.com with Microsoft SMTPSVC(6.0.3790.2668); Sat, 17 Mar 2007 08:51:04 -0700 Received: from mail pickup service by hotmail.com with Microsoft SMTPSVC; Sat, 17 Mar 2007 08:51:04 -0700 Message-ID: Received: from 4.171.114.204 by BAY115-DAV5.phx.gbl with DAV; Sat, 17 Mar 2007 15:51:02 +0000 X-Originating-IP: [4.171.114.204] X-Originating-Email: [lors01@msn.com] X-Sender: lors01@msn.com From: "Tracy Crook" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] pressure caps Date: Sat, 17 Mar 2007 11:50:58 -0400 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_007C_01C7688A.873DAC50" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: MSN 9 X-MimeOLE: Produced By MSN MimeOLE V9.50.0034.2000 Seal-Send-Time: Sat, 17 Mar 2007 11:50:58 -0400 X-OriginalArrivalTime: 17 Mar 2007 15:51:04.0765 (UTC) FILETIME=[11EB5ED0:01C768AC] Return-Path: lors01@msn.com This is a multi-part message in MIME format. ------=_NextPart_000_007C_01C7688A.873DAC50 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable I flew for several years with the stock 13lb cap. I did have a minor = boil over once at 16,000 ft when climbing WOT at low speed (trying to = out-climb a storm front). Smelled the sweet smell of coolant and backed = off and all was well but that prompted a change to a higher pressure = cap. Coolant boiling point of 260F is at sea level since the cap is a gauge = pressure (relative to ambient) not absolute. Absolute pressure = determines boiling point. I haven't done the math to determine how much = lower it would be at 16,000 ft. Tracy ----- Original Message -----=20 From: George Graham=20 To: Rotary motors in aircraft=20 Sent: Friday, March 16, 2007 10:44 PM Subject: [FlyRotary] pressure caps I have been flying for almost ten years with the stock radiator cap. = It is at the highest location, and vents into a one quart gatorade = bottle. Has never had a coolant problem, has climbed to eighteen thousand = feet. Usually has a water temp at the 190 deg stock thermostat setting. As I understand it, the twelve pounds of pressure raise the boiling = point to 260 deg. George Graham Sarasota Florida Mazda RX7 EZ=20 -------------------------------------------------------------------------= --- No need to miss a message. Get email on-the-go = with Yahoo! Mail for Mobile. Get = started. -------------------------------------------------------------------------= ----- Sucker-punch = spam with award-winning protection. Try the free Yahoo! Mail = Beta. ------=_NextPart_000_007C_01C7688A.873DAC50 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
I flew for several years with the stock 13lb cap.  I did have = a minor=20 boil over once at 16,000 ft when climbing WOT at low speed (trying = to=20 out-climb a storm front).  Smelled the sweet smell of coolant and = backed=20 off and all was well but that prompted a change to a higher pressure = cap.
 
Coolant boiling point of 260F is at sea level since the cap is a = gauge=20 pressure (relative to ambient) not absolute.  Absolute pressure = determines=20 boiling point.  I haven't done the math to determine how much lower = it=20 would be at 16,000 ft.
 
Tracy
 
----- Original Message -----
To: Rotary motors in = aircraft
Sent: Friday, March 16, 2007 = 10:44=20 PM
Subject: [FlyRotary] pressure = caps




I=20 have been flying for almost ten years with the stock radiator = cap.  It=20 is at the highest location, and vents into a one quart gatorade=20 bottle.

Has never had a coolant problem, has climbed to = eighteen=20 thousand feet.  Usually has a water temp at the 190 deg stock=20 thermostat setting.

As I understand it, the twelve pounds of = pressure=20 raise the boiling point to 260 deg.




George=20 Graham
Sarasota Florida
Mazda RX7 EZ=20
No need to miss a message. Get=20 email on-the-go
with Yahoo! Mail for Mobile. Get=20 started.

Sucker-punch=20 spam with award-winning protection.
Try the free=20 Yahoo! Mail Beta.
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