X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from [24.25.9.102] (HELO ms-smtp-03-eri0.southeast.rr.com) by logan.com (CommuniGate Pro SMTP 4.3.5) with ESMTP id 1022375 for flyrotary@lancaironline.net; Sun, 26 Jun 2005 16:58:50 -0400 Received-SPF: pass receiver=logan.com; client-ip=24.25.9.102; envelope-from=eanderson@carolina.rr.com Received: from edward2 (cpe-065-188-083-049.carolina.res.rr.com [65.188.83.49]) by ms-smtp-03-eri0.southeast.rr.com (8.12.10/8.12.7) with SMTP id j5QKw1Y5022202 for ; Sun, 26 Jun 2005 16:58:03 -0400 (EDT) Message-ID: <002301c57a91$c1ce8170$2402a8c0@edward2> From: "Ed Anderson" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] Re: Coolant Leak Date: Sun, 26 Jun 2005 16:58:08 -0400 MIME-Version: 1.0 Content-Type: text/plain; format=flowed; charset="iso-8859-1"; reply-type=response Content-Transfer-Encoding: 7bit X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2900.2180 X-MIMEOLE: Produced By Microsoft MimeOLE V6.00.2900.2180 X-Virus-Scanned: Symantec AntiVirus Scan Engine >>>> Homepage: http://www.flyrotary.com/ >>>> Archive: http://lancaironline.net/lists/flyrotary/List.html >>> >> >> > Keep in mind the total incompressibility of liquid, in an air free system > 1 additional drop of water can send the pressure skyrocketing. The only > expansion room available is probably your hoses then the cap. Tim A > > Hi Tim, I think something like you mention is occurring. In fact, thinking further about it, it may be that the initial heat of the combustion chamber causes the water in the side housings next to the combustion chamber to elevate in temperature almost immediately and expand in a constrained space with no air. Thus as you suggested, giving rise to the rapid pressure increase. Then after a few minutes of running the metal of the block (and other parts) will have heated (and expanded) increasing the coolant volumetric area resulting in more volume and therefore less pressure. Ed A