X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from cdptpa-omtalb.mail.rr.com ([75.180.132.120] verified) by logan.com (CommuniGate Pro SMTP 5.2c4) with ESMTP id 2695806 for flyrotary@lancaironline.net; Sun, 27 Jan 2008 17:37:34 -0500 Received-SPF: pass receiver=logan.com; client-ip=75.180.132.120; envelope-from=eanderson@carolina.rr.com Received: from edward2 ([24.74.103.61]) by cdptpa-omta05.mail.rr.com with SMTP id <20080127223655.XNQY9785.cdptpa-omta05.mail.rr.com@edward2> for ; Sun, 27 Jan 2008 22:36:55 +0000 Message-ID: <001301c86135$24471ba0$2402a8c0@edward2> From: "Ed Anderson" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] Re: Water Return in Radiator Date: Sun, 27 Jan 2008 17:37:04 -0500 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0010_01C8610B.3B2E3E40" 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_0010_01C8610B.3B2E3E40 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable I agree, Wendell, the angle of the heater return into the return side of = the radiator does seem a bit strange. You would certainly think they = would want it pointed toward the water pump inlet in the direction of = the flow. Sometimes production considerations override engineering = considerations - it looks like it might be a bit more difficult to = produce if the top of heater tube was oriented toward the radiator = rather than away as they have apparently done it. But, still hard to = believe they couldn't have found a better angle. =20 Ed ----- Original Message -----=20 From: Wendell Voto=20 To: Rotary motors in aircraft=20 Sent: Sunday, January 27, 2008 3:51 PM Subject: [FlyRotary] Re: Water Return in Radiator ----- 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_0010_01C8610B.3B2E3E40 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
I agree, Wendell, the angle of the heater return = into the=20 return side of the radiator does seem a bit strange.  You would = certainly=20 think they would want it pointed toward the water pump inlet in the = direction of=20 the flow.  Sometimes production considerations override engineering = considerations -  it looks like it might be a bit more difficult to = produce=20 if the top of heater tube was oriented toward the radiator rather than = away as=20 they have apparently done it.  But, still hard to believe they = couldn't=20 have found a better angle. 
 
Ed
----- Original Message -----
From:=20 Wendell = Voto=20
Sent: Sunday, January 27, 2008 = 3:51=20 PM
Subject: [FlyRotary] Re: Water = Return in=20 Radiator

 
----- Original Message -----
From:=20 Ed Anderson
To: Rotary motors in = aircraft=20
Sent: Sunday, January 27, = 2008 8:56=20 AM
Subject: [FlyRotary] Re: = Water Return=20 in 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=20 is routed to  the hose from the radiator to the inlet=20 side of the pump.  At least it is in the both the 1986 = and=20 1991 shop manuals I have.  This is a low pressure = area whereas the=20 hose from outlet of waterpump (thermostat housing) to the radiator = is in a=20 higher pressure area.
 
Ed
I stand corrected (sort = of), just=20 had 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,=20 and would be against the flow going back to the engine and IMHO = would=20 restrict coolant flow to the = heater. This is presuming that=20 the heater flow is going from the outlet on the rear = housing, to=20 the heater and then back to the engine. The additional cooling = by=20 passing the heater coolant through the radiator would be minor and = when the=20 heater is needed, it is cold and no extra engine cooling would be=20 necessary.  For max heater flow, one would want the Y facing = the=20 engine. 
 
Wendell
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