X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from x.itlnet.net ([64.19.112.9] verified) by logan.com (CommuniGate Pro SMTP 5.2c4) with ESMTPS id 2695696 for flyrotary@lancaironline.net; Sun, 27 Jan 2008 15:50:50 -0500 Received-SPF: pass receiver=logan.com; client-ip=64.19.112.9; envelope-from=jwvoto@itlnet.net Received: from x.itlnet.net (localhost.localdomain [127.0.0.1]) by x.itlnet.net (8.13.1/8.13.1) with SMTP id m0RKnej0028830 for ; Sun, 27 Jan 2008 14:49:40 -0600 Received: from itlnet.net (email2.itlnet.net [192.168.10.157]) by x.itlnet.net (x.itlnet.net [172.16.1.148]) id k0QEne12556262510L ret-id none; Sun, 27 Jan 2008 14:49:40 -0600 Received: from JWVOTO (unverified [64.19.115.138]) by itlnet.net (SurgeMail 3.8p) with ESMTP id 203765-1769559 for ; Sun, 27 Jan 2008 14:49:39 -0600 Message-ID: <002701c86126$7fe7ac40$8a731340@JWVOTO> From: "Wendell Voto" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] Re: Water Return in Radiator Date: Sun, 27 Jan 2008 14:51:21 -0600 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0024_01C860F4.14ECA940" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 5.50.4133.2400 X-MimeOLE: Produced By Microsoft MimeOLE V5.50.4133.2400 X-Authenticated-User: jwvoto@itlnet.net X-ITLnet-MailScanner-Information: Please contact the ISP for more information X-ITLnet-MailScanner: Found to be clean X-ITLnet-MailScanner-SpamCheck: not spam, SpamAssassin (not cached, score=-2.599, required 4, autolearn=not spam, BAYES_00 -2.60, HTML_MESSAGE 0.00, SPF_HELO_PASS -0.00) This is a multi-part message in MIME format. ------=_NextPart_000_0024_01C860F4.14ECA940 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable ----- Original Message -----=20 From: Ed Anderson=20 To: Rotary motors in aircraft=20 Sent: Sunday, January 27, 2008 8:56 AM Subject: [FlyRotary] Re: Water Return in Radiator 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 I stand corrected (sort of), just had the radiator upside down when = first looked at it. The angle of the heater return connection is not 90 = degrees and angles toward the radiator, and would be against the flow = going back to the engine and IMHO would restrict coolant flow to the = heater. This is presuming that the heater flow is going from the outlet = on the rear housing, to the heater and then back to the engine. The = additional cooling by passing the heater coolant through the radiator = would be minor and when the heater is needed, it is cold and no extra = engine cooling would be necessary. For max heater flow, one would want = the Y facing the engine.=20 Wendell ------=_NextPart_000_0024_01C860F4.14ECA940 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
 
----- Original Message -----
From:=20 Ed=20 Anderson
Sent: Sunday, January 27, 2008 = 8:56=20 AM
Subject: [FlyRotary] Re: Water = Return in=20 Radiator

Wendell, while the heater return does return = to the=20 radiator hose, it is not the hose connected to the = output=20 side of the pump (thermostat housing) , but instead the heater = return is=20 routed to  the hose from the radiator to the inlet = side=20 of the 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 = area.
 
Ed
I stand corrected (sort = of), just had=20 the radiator upside down when first looked at it.  The angle of = the=20 heater return connection is not 90 degrees and angles toward the = radiator, and=20 would be against the flow going back to the engine and IMHO would = restrict=20 coolant flow to the heater. This is presuming that=20 the heater flow is going from the outlet on the rear = housing, to the=20 heater and then back to the engine. The additional cooling by = passing the=20 heater coolant through the radiator would be minor and when the heater = is=20 needed, it is cold and no extra engine cooling would be = necessary.  For=20 max heater flow, one would want the Y facing the = engine. 
 
Wendell
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