X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from wproxy.gmail.com ([64.233.184.226] verified) by logan.com (CommuniGate Pro SMTP 5.0.9) with ESMTP id 1070046 for flyrotary@lancaironline.net; Sun, 16 Apr 2006 16:05:13 -0400 Received-SPF: pass receiver=logan.com; client-ip=64.233.184.226; envelope-from=russell.duffy@gmail.com Received: by wproxy.gmail.com with SMTP id 36so911939wra for ; Sun, 16 Apr 2006 13:04:29 -0700 (PDT) DomainKey-Signature: a=rsa-sha1; q=dns; c=nofws; s=beta; d=gmail.com; h=received:from:to:subject:date:message-id:mime-version:content-type:x-priority:x-msmail-priority:x-mailer:importance:in-reply-to:x-mimeole; b=MwsskuWLPFqQy9CzOy8FtrqDv8l5nPUgpBmN2iT5GIQi05pKZJ6DhzcWjDDrKpheUTFNlSG5+iqImRChkAQLoCc7QyG9mxLzieQzNM0adzKQq2ng1Ggci2zgTt03zoCGiiQHz1/gvyaLwDHO1l36TwLeowAafTw1YXZa13Y/hd8= Received: by 10.54.120.8 with SMTP id s8mr792265wrc; Sun, 16 Apr 2006 13:04:25 -0700 (PDT) Return-Path: Received: from rd ( [65.6.194.9]) by mx.gmail.com with ESMTP id 40sm2717312wrl.2006.04.16.13.04.24; Sun, 16 Apr 2006 13:04:24 -0700 (PDT) From: "Russell Duffy" To: "'Rotary motors in aircraft'" Subject: RE: [FlyRotary] coolant header plumbing Date: Sun, 16 Apr 2006 15:04:23 -0500 Message-ID: <000001c66190$f5297e80$6101a8c0@rd> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0001_01C66167.0C537680" 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 V6.00.2900.2869 This is a multi-part message in MIME format. ------=_NextPart_000_0001_01C66167.0C537680 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable I'm currious if this will work, or if I will get air to the wrong = places. =20 =20 Hi Chris, =20 I would suggest that you use a tank, mounted to the top of the firewall = if possible, so the fill cap will be the highest location. It's not a show stopper if you can't put it there, but it will make filling the system = much more difficult if the fill cap isn't the highest point. =20 =20 The tank would have the pressure cap, with it's overflow hose going to = the bottom of any old overflow jug. It would also have two other small = nipples for hoses. One would be at the very bottom of the tank, and would = connect to the hose you labeled as "bottom of overflow tank". The second nipple = in the tank would be near the middle (top to bottom). This would connect = to the hose you labeled as "top of overflow tank". =20 =20 The idea is to use this pressurized tank to removed all the air from the system, and it's the way Mazda did it on the FD. The two hoses in your picture are connected to opposite sides of the water pump, so they = aren't at the same pressure. When you connect these both to a tank, there will be flow through the tank. Since this bypasses the radiator, you don't want these to be very big. =20 =20 What happens is the water (with air bubbles) flows from the top of the system, into the middle of your tank. The air bubbles go up, and the coolant goes down. The return flow to the engine goes out the bottom = hose in your tank, so nothing but coolant is returned. The air is collected = at the top of your tank, where the pressure cap is. During normal heat = cycles, the air will get pushed out into the overflow jug, and coolant will get sucked back in when the engine cools. =20 =20 BTW, Mazda called this (amazingly enough) an "AST" or Air Separator = Tank. =20 =20 The AST tank doesn't have to be large. Even a pint would do, but I'd = try to go a bit larger than that. Taller rather than wider would be a plus as well. The plastic overflow jug should be at least a quart, or better a quart and a half. =20 =20 Cheers, Rusty (hanging heavy expensive object on the nose now) =20 ------=_NextPart_000_0001_01C66167.0C537680 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Message
I'm currious if = this will work,=20 or if I will get air to the wrong places.   
 
Hi=20 Chris,
 
I would = suggest that you use=20 a tank, mounted to the top of the firewall if possible, so the fill cap = will be=20 the highest location.  It's not a show stopper if you can't put it = there,=20 but it will make filling the system much more difficult if the fill cap = isn't=20 the highest point. 
 
The tank would have the pressure cap, with = it's=20 overflow hose going to the bottom of any old overflow jug.  It = would=20 also have two other small nipples for hoses.  One would be at the = very=20 bottom of the tank, and would connect to the hose you labeled as = "bottom of=20 overflow tank".  The second nipple in the tank would be near the = middle=20 (top to bottom).  This would connect to the hose you labeled as = "top of=20 overflow tank".  
 
The idea is to use this pressurized tank to = removed all=20 the air from the system, and it's the way Mazda did it on the FD.  = The two=20 hoses in your picture are connected to opposite sides of the water pump, = so they=20 aren't at the same pressure.  When you connect these both to a = tank,=20 there will be flow through the tank.  Since this bypasses the = radiator, you=20 don't want these to be very big.  =
 
What happens is the water (with air bubbles) = flows from=20 the top of the system, into the middle of your tank.  The air = bubbles go=20 up, and the coolant goes down.  The return flow to the engine goes = out the=20 bottom hose in your tank, so nothing but coolant is returned.  The = air is=20 collected at the top of your tank, where the pressure cap is.  = During=20 normal heat cycles, the air will get pushed out into the overflow jug, = and=20 coolant will get sucked back in when the engine cools.  =20
 
BTW, Mazda called this (amazingly enough) an = "AST" or=20 Air Separator Tank. 
 
The AST tank doesn't have to be large.  = Even a=20 pint would do, but I'd try to go a bit larger than that.  Taller = rather=20 than wider would be a plus as well.   The plastic overflow jug = should=20 be at least a quart, or better a quart and a half. =20
 
Cheers,
Rusty (hanging heavy expensive object on the = nose=20 now) 
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