X-Virus-Scanned: clean according to Sophos on Logan.com X-SpamCatcher-Score: 10 [X] Return-Path: Received: from imf19aec.mail.bellsouth.net ([205.152.59.67] verified) by logan.com (CommuniGate Pro SMTP 5.1.7) with ESMTP id 1925475 for flyrotary@lancaironline.net; Fri, 16 Mar 2007 21:37:43 -0400 Received-SPF: none receiver=logan.com; client-ip=205.152.59.67; envelope-from=rusty@radrotary.com Received: from ibm60aec.bellsouth.net ([65.6.194.9]) by imf19aec.mail.bellsouth.net with ESMTP id <20070317013658.KQES13729.imf19aec.mail.bellsouth.net@ibm60aec.bellsouth.net> for ; Fri, 16 Mar 2007 21:36:58 -0400 Received: from rd ([65.6.194.9]) by ibm60aec.bellsouth.net with ESMTP id <20070317013657.ZVKW1536.ibm60aec.bellsouth.net@rd> for ; Fri, 16 Mar 2007 21:36:57 -0400 From: "Russell Duffy" To: "'Rotary motors in aircraft'" Subject: RE: [FlyRotary] Re: Water Plumbing Date: Fri, 16 Mar 2007 20:36:57 -0500 Message-ID: <001a01c76834$c098dca0$6e01a8c0@rd> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_001B_01C7680A.D7C2D4A0" X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook, Build 10.0.6822 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.3028 Thread-Index: Acdn6i5KLPYjgVUuS6Wk1CbvaxK63wASa2eg Importance: Normal In-Reply-To: This is a multi-part message in MIME format. ------=_NextPart_000_001B_01C7680A.D7C2D4A0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Is the recommended system pressure represented at the AST cap or the = fill cap? I'm thinking that the system pressure will be set by the cap that = is lowest in pressure. Therefore, according to your recommendation, the = AST cap will set system pressure and the fill cap will probably not see much = in the way of pressure release duties. =20 =20 Hi Steve, =20 You really only need one pressure cap, and it needs to be on the AST, = since that's where the air collects. After a couple heat cycles, the air will = all be pushed out, and replaced with coolant from the overflow tank. The = only reason I mentioned another cap is because you said you had a nice inline cap, and it would be convenient to use as a fill port high in the = system. =20 =20 You can also fill the system by removing the hose at the water pump = outlet, since you said that was the highest point. That's sort of a pain to do, = but requires no extra parts or weight. =20 Cheers, Rusty =20 ------=_NextPart_000_001B_01C7680A.D7C2D4A0 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Message
Is the recommended system pressure represented at the AST cap or = the fill=20 cap?  I'm thinking that the system pressure will be set by the cap = that is=20 lowest in pressure.  Therefore, according to your recommendation, = the AST=20 cap will set system pressure and the fill cap will probably not see much = in the=20 way of pressure release duties.   
 
Hi=20 Steve,
 
You really=20 only need one pressure cap, and it needs to be on the AST, since = that's=20 where the air collects.  After a couple heat cycles, the air will = all be=20 pushed out, and replaced with coolant from the overflow tank.  The = only=20 reason I mentioned another cap is because you said you had a nice = inline=20 cap, and it would be convenient to use as a fill port high in the=20 system.   
 
You can also=20 fill the system by removing the hose at the water pump outlet, since you = said=20 that was the highest point.  That's sort of a pain to do, but = requires no=20 extra parts or weight.
 
Cheers,
Rusty  =20
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