X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from eastrmmtao02.cox.net ([68.230.240.37] verified) by logan.com (CommuniGate Pro SMTP 5.0.9) with ESMTP id 1070121 for flyrotary@lancaironline.net; Sun, 16 Apr 2006 17:24:56 -0400 Received-SPF: none receiver=logan.com; client-ip=68.230.240.37; envelope-from=candtmallory@cox.net Received: from chrish7s5nwiv2 ([68.106.204.110]) by eastrmmtao02.cox.net (InterMail vM.6.01.06.01 201-2131-130-101-20060113) with SMTP id <20060416212410.DBKB17664.eastrmmtao02.cox.net@chrish7s5nwiv2> for ; Sun, 16 Apr 2006 17:24:10 -0400 Message-ID: <000901c6619c$2ba7af80$6ecc6a44@chrish7s5nwiv2> From: "chris mallory" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] Re: coolant header plumbing Date: Sun, 16 Apr 2006 16:24:39 -0500 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0006_01C66172.4289F020" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2600.0000 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2600.0000 This is a multi-part message in MIME format. ------=_NextPart_000_0006_01C66172.4289F020 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable MessageThanks Russell! Great explanation. At least this part of the = install will be easy. Hopefully I didn't just jink myself. Chris ----- Original Message -----=20 From: Russell Duffy=20 To: Rotary motors in aircraft=20 Sent: Sunday, April 16, 2006 3:04 PM Subject: [FlyRotary] Re: coolant header plumbing I'm currious if this will work, or if I will get air to the wrong = places. =20 Hi Chris, 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 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 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 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 BTW, Mazda called this (amazingly enough) an "AST" or Air Separator = Tank. =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 Cheers, Rusty (hanging heavy expensive object on the nose now) =20 ------=_NextPart_000_0006_01C66172.4289F020 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Message
Thanks Russell! Great = explanation.  At least=20 this part of the install will be easy.  Hopefully I didn't just = jink=20 myself.
 
Chris
----- Original Message -----
From:=20 Russell=20 Duffy
Sent: Sunday, April 16, 2006 = 3:04=20 PM
Subject: [FlyRotary] Re: = coolant header=20 plumbing

I'm currious if = this will=20 work, or if I will get air to the wrong places.   
 
Hi=20 Chris,
 
I would = suggest that you=20 use a tank, mounted to the top of the firewall if possible, so the = fill cap=20 will be the highest location.  It's not a show stopper if you = can't put=20 it there, but it will make filling the system much more difficult if = the fill=20 cap isn't 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=20 of overflow tank".  The second nipple in the tank would be near = the=20 middle (top to bottom).  This would connect to the hose you = labeled as=20 "top of overflow tank".  
 
The idea is to use this pressurized tank to = removed=20 all the air from the system, and it's the way Mazda did it on the = FD. =20 The two hoses in your picture are connected to opposite sides of the = water=20 pump, so they aren't at the same pressure.  When you connect = these=20 both to a tank, there will be flow through the tank.  Since this = bypasses=20 the radiator, you don't want these to be very big. =20
 
What happens is the water (with air = bubbles) flows=20 from the top of the system, into the middle of your tank.  The = air=20 bubbles go up, and the coolant goes down.  The return flow to the = engine=20 goes out the bottom hose in your tank, so nothing but coolant is=20 returned.  The air is collected at the top of your tank, where = the=20 pressure cap is.  During normal heat cycles, the air will get = pushed out=20 into the overflow jug, and coolant will get sucked back in when the = engine=20 cools.  
 
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=20 should 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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