X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from mail08.syd.optusnet.com.au ([211.29.132.189] verified) by logan.com (CommuniGate Pro SMTP 5.0.3) with ESMTPS id 870350 for flyrotary@lancaironline.net; Fri, 09 Dec 2005 22:54:56 -0500 Received-SPF: none receiver=logan.com; client-ip=211.29.132.189; envelope-from=lendich@optusnet.com.au Received: from george (d220-236-121-54.dsl.nsw.optusnet.com.au [220.236.121.54]) by mail08.syd.optusnet.com.au (8.12.11/8.12.11) with SMTP id jBA3s4LJ001959 for ; Sat, 10 Dec 2005 14:54:07 +1100 Message-ID: <003801c5fd3d$630a77f0$3679ecdc@george> From: "george lendich" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] Re: Radiator Expansion Tank Date: Sat, 10 Dec 2005 13:54:13 +1000 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0035_01C5FD91.3409CD30" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2800.1106 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 This is a multi-part message in MIME format. ------=_NextPart_000_0035_01C5FD91.3409CD30 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable MessageThanks Rusty! George (down under) ----- Original Message -----=20 From: Russell Duffy=20 To: Rotary motors in aircraft=20 Sent: Saturday, December 10, 2005 10:03 AM Subject: [FlyRotary] Re: Radiator Expansion Tank Al, Rusty and others. I've been a little confused with the set- up recommended. Do you have = a pressure cap on the Radiator as well as the Expansion tank and do you = have an overflow bottle attached to the expansion tank. I've also seen where the rad pressure cap is not on the rad but on the = return to the pump.=20 I'm not sure how I got dragged into this :-) =20 Take a look at the system that Mazda used on the FD. It's a pretty = good system, give or take the plastic parts. Hmmm, I wonder if the RX-8 = uses the same system. Anyone know? As I understand it, the point is to get all the air out of the coolant = loop. The FD actually has two pressure caps, though only one has a = pressure relief valve in it. The one without the valve is simply a = filler cap, and is located at the high point of the system (WP housing = outlet on the FD). =20 The one with the pressure relief valve (normal radiator cap) is = located on top of a small tank that is appropriately named the "Air = Separator Tank" (AST). This tank has two small hoses, which flow = coolant through the tank all the time. One hose comes from the output = of the water pump, as high as possible in the engine. It runs into the = AST, about half way between top and bottom of the tank. The other AST = hose goes out the bottom of the tank, and to the inlet side of the water = pump. =20 The idea is to take water from the high point in the engine, where air = would tend to collect, and send it to the middle of the AST. When it = goes in, the air rises to the top, and the liquid stays at the bottom. = Since the other hose is on the bottom, only liquid is returned to the = engine. =20 The cap on top of the AST has a pressure relief valve, with a hose = that goes to the bottom of a basic overflow jug. When the engine warms = up, any air that was collected in the top of the AST gets pushed out to = the overflow jug. When the engine later cools, coolant is sucked back = in from the overflow jug. After a few cycles, all the air will be = purged, and it will stay that way unless the system leaks, or needs to = be drained for some other reason. =20 Keep in mind that there are any number of ways to make a functional = cooling system. All you've got to do is seal the pressure, and remove = the air. Simple :-) Cheers, Rusty (wishing it was summer here, rather than winter)=20 ------=_NextPart_000_0035_01C5FD91.3409CD30 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Message
Thanks Rusty!
George (down under)
----- Original Message -----
From:=20 Russell=20 Duffy
Sent: Saturday, December 10, = 2005 10:03=20 AM
Subject: [FlyRotary] Re: = Radiator=20 Expansion Tank

Al, Rusty = and=20 others.
 
I've been = a little=20 confused with the set- up recommended. Do you have a pressure cap = on the=20 Radiator as well as the Expansion tank and do you have an overflow = bottle=20 attached to the expansion tank.
I've also = seen=20 where the rad pressure cap is not on the rad but on the return to = the=20 pump. 
 
 
I'm not sure=20 how I got dragged into this=20 :-)  
 
Take a look at=20 the system that Mazda used on the FD.  It's a pretty good = system,=20 give or take the plastic parts.  Hmmm, I wonder if the RX-8 = uses the=20 same system.  Anyone=20 know?
 
As I understand=20 it, the point is to get all the air out of the coolant loop.  The = FD=20 actually has two pressure caps, though only one has a pressure relief = valve in=20 it.  The one without the valve is simply a filler cap, and = is=20 located at the high point of the system (WP housing outlet on the=20 FD).  
 
The one with=20 the pressure relief valve (normal radiator cap) is located on top of a = small=20 tank that is appropriately named the "Air Separator Tank" = (AST). =20 This tank has two small hoses, which flow coolant through the = tank all=20 the time.  One hose comes from the output of the water pump, = as high=20 as possible in the engine.  It runs into the AST, about half way = between=20 top and bottom of the tank.  The other AST hose goes out the = bottom=20 of the tank, and to the inlet side of the water=20 pump.  
 
The idea=20 is to take water from the high point in the engine, where air = would tend=20 to collect, and send it to the middle of the AST.  When it goes = in, the=20 air rises to the top, and the liquid stays at the bottom.  Since=20 the other hose is on the bottom, only liquid is returned to = the=20 engine.  
 
The cap on top=20 of the AST has a pressure relief valve, with a hose that = goes to the=20 bottom of a basic overflow jug.  When the engine warms up, any = air that=20 was collected in the top of the AST gets pushed out to the overflow = jug. =20 When the engine later cools, coolant is sucked back in from = the=20 overflow jug.  After a few cycles, all the air will be purged, = and it=20 will stay that way unless the system leaks, or needs to be = drained for=20 some other = reason.  
 
Keep in mind=20 that there are any number of ways to make a functional cooling=20 system.  All you've got to do is seal the pressure, and remove = the=20 air.  Simple :-)
 
Cheers,
Rusty (wishing=20 it was summer here, rather than=20 winter) 
 
 
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