X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from cdptpa-omtalb.mail.rr.com ([75.180.132.121] verified) by logan.com (CommuniGate Pro SMTP 5.2c4) with ESMTP id 2695393 for flyrotary@lancaironline.net; Sun, 27 Jan 2008 09:56:31 -0500 Received-SPF: pass receiver=logan.com; client-ip=75.180.132.121; envelope-from=eanderson@carolina.rr.com Received: from edward2 ([24.74.103.61]) by cdptpa-omta02.mail.rr.com with SMTP id <20080127145551.JLNM12601.cdptpa-omta02.mail.rr.com@edward2> for ; Sun, 27 Jan 2008 14:55:51 +0000 Message-ID: <000b01c860f4$bafcde40$2402a8c0@edward2> From: "Ed Anderson" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] Re: Water Return in Radiator Date: Sun, 27 Jan 2008 09:56:00 -0500 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0008_01C860CA.D1D5D010" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2900.3138 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.3138 This is a multi-part message in MIME format. ------=_NextPart_000_0008_01C860CA.D1D5D010 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Wendell, while the heater return does return to the radiator hose, it is = not the hose connected to the output side of the pump (thermostat = housing) , but instead the heater return is routed to the hose from the = radiator to the inlet side of the pump. At least it is in the both the = 1986 and 1991 shop manuals I have. This is a low pressure area whereas = the hose from outlet of waterpump (thermostat housing) to the radiator = is in a higher pressure area. Ed Doug, I took a look at the Mazda radiator to confirm my recollection of = the car version to the heater return. It is Y connected to the radiator = and it looks to me as if it is connected to the line that comes from the = water pump. This would be a high pressure area except the way the Y is = used, it causes the flow from the heater to pass thru the radiator for = additional cooling before returning to the engine. I was thinking of = returning mine back to the water pump directly, no additional radiator = cool, but use a throttling valve to adjust flow of cut it off = completely. Wendell. ------=_NextPart_000_0008_01C860CA.D1D5D010 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
Wendell, while the heater return does return to = the=20 radiator hose, it is not the hose connected to the = output side=20 of the pump (thermostat housing) , but instead the heater return is = routed=20 to  the hose from the radiator to the inlet side = of the=20 pump.  At least it is in the both the 1986 and 1991 shop manuals I=20 have.  This is a low pressure area whereas the hose from = outlet of=20 waterpump (thermostat housing) to the radiator is in a higher pressure=20 area.
 
Ed
 
Doug,
I took a look at = the Mazda=20 radiator to confirm my recollection of the car version to the heater = return.  It is Y connected to the radiator and it looks to me = as if it=20 is connected to the line that comes from the water pump. This would = be a=20 high pressure area except the way the Y is used, it causes the flow = from the=20 heater to pass thru the radiator for additional cooling before = returning to=20 the engine.  I was thinking of returning mine back to the water = pump=20 directly, no additional radiator cool, but use a throttling valve to = adjust=20 flow of cut it off completely.
Wendell.
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