X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from fed1rmmtao12.cox.net ([68.230.241.27] verified) by logan.com (CommuniGate Pro SMTP 4.3.5) with ESMTP id 1022781 for flyrotary@lancaironline.net; Mon, 27 Jun 2005 01:27:50 -0400 Received-SPF: none receiver=logan.com; client-ip=68.230.241.27; envelope-from=ALVentures@cox.net Received: from BigAl ([68.7.14.39]) by fed1rmmtao12.cox.net (InterMail vM.6.01.04.00 201-2131-118-20041027) with ESMTP id <20050627052700.RNZO550.fed1rmmtao12.cox.net@BigAl> for ; Mon, 27 Jun 2005 01:27:00 -0400 From: "Al Gietzen" To: "'Rotary motors in aircraft'" Subject: RE: [FlyRotary] Re: Coolant Leak Date: Sun, 26 Jun 2005 22:27:10 -0700 Message-ID: <000001c57ad8$de3f6b70$6400a8c0@BigAl> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0001_01C57A9E.31E30470" X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook, Build 10.0.6626 Importance: Normal In-Reply-To: X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.2180 This is a multi-part message in MIME format. ------=_NextPart_000_0001_01C57A9E.31E30470 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable I'm sorry Georges, I don't understand your statement. All auto cooling sys I'm familiar with have rad cap on top of radiator. = They are designed to have no air in the cooling system. Shortly after you = start up the car, coolant flows from cap 14psi valve to overflow bottle. This pressure increase is entirely due to coolant expansion due to heat. When = you shut car off, the pressure drop in the radiator draws in coolant from = cap 1 psi valve connected to overflow bottle back into the radiator. Thus the radiator is always full to top. =20 Al W. =20 Mercedes, Volkswagon, Volvo (to name a few) have/had radiators with no = cap, connected to an expansion tank that you fill about half way. The = expansion tank - higher than the top of the rad - has the 13-15 psi cap. =20 FWIW; =20 Al G. ------=_NextPart_000_0001_01C57A9E.31E30470 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

I'm sorry Georges, I don't understand your statement.

All auto cooling sys I'm = familiar with have rad cap on top of radiator. They are designed to have no air = in the cooling system. Shortly after you start up the car, coolant = flows from cap 14psi valve to overflow bottle. This pressure increase is entirely due to coolant expansion due to heat. When you shut car off, = the pressure drop in the radiator draws in coolant from cap 1 psi valve connected to  overflow bottle back into the radiator. Thus the = radiator is always full to top.

 

Al W.

 

Mercedes, Volkswagon, Volvo (to name a few) have/had radiators with no cap, = connected to an expansion tank that you fill about half way.  The expansion tank = – higher than the top of the rad -  has the 13-15 psi = cap.

 

FWIW;

 

Al G.

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