X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from cdptpa-omtalb.mail.rr.com ([75.180.132.122] verified) by logan.com (CommuniGate Pro SMTP 5.4.0) with ESMTP id 5066520 for flyrotary@lancaironline.net; Thu, 28 Jul 2011 10:51:18 -0400 Received-SPF: pass receiver=logan.com; client-ip=75.180.132.122; envelope-from=eanderson@carolina.rr.com Return-Path: X-Authority-Analysis: v=1.1 cv=8mDY8c80ZOa76EOwICuS+E2YRQjxDgO9xqUnRMONc7w= c=1 sm=0 a=ZEKGMQuax1IA:10 a=rPkcCx1H5rrOSfN0dPC7kw==:17 a=-TWXWfuBAAAA:8 a=yOH4gQvd4aPpfqTL69UA:9 a=C6VY0Hpg19toFXcy_YYA:7 a=wPNLvfGTeEIA:10 a=dVayXz7UDosA:10 a=yMhMjlubAAAA:8 a=on22okXAAAAA:8 a=Ia-xEzejAAAA:8 a=cpa3rGxvY8O0VmANgAoA:9 a=Loia1KEwVQE4TC9sGg4A:7 a=at0Q5_2dr5wA:10 a=EzXvWhQp4_cA:10 a=aTnxH5rqqb0A:10 a=rPkcCx1H5rrOSfN0dPC7kw==:117 X-Cloudmark-Score: 0 X-Originating-IP: 174.110.167.5 Received: from [174.110.167.5] ([174.110.167.5:51775] helo=EdPC) by cdptpa-oedge03.mail.rr.com (envelope-from ) (ecelerity 2.2.3.46 r()) with ESMTP id F3/FF-00666-247713E4; Thu, 28 Jul 2011 14:50:42 +0000 Message-ID: From: "Ed Anderson" To: "Rotary motors in aircraft" References: In-Reply-To: Subject: Re: [FlyRotary] Coolant Restrictor Plate Date: Thu, 28 Jul 2011 10:50:09 -0400 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0019_01CC4D14.1EA1D9F0" X-Priority: 3 X-MSMail-Priority: Normal Importance: Normal X-Mailer: Microsoft Windows Live Mail 14.0.8117.416 X-MimeOLE: Produced By Microsoft MimeOLE V14.0.8117.416 This is a multi-part message in MIME format. ------=_NextPart_000_0019_01CC4D14.1EA1D9F0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable More details, Jeff? From my reading on cooling systems, the only time I have read of an = improvement in cooling using a restrictor plate is in the case where the = water pump is cavitaing. The restrictor plate improving cooling in that = case because it produces more back pressure around the impeller and = eliminates/reduces the air bubble caused by cavitations. This permits = the impeller to pump coolant rather than trying to pump air. Otherwise, the old myth about restrictors/slow water cooling better is = just that - a myth. Now it may well be that a hose size larger than 0.75" dia is unnecessary = for some installations and going above size that does not really = increase flow rate or cooling, so not saying what you found to be in = error, but just didn't want folks to think that restriction =3D better = cooling. The basic equation for heat removal ('Q') clearly shows that more mass = flow ('M') equals more heat removal. Q =3D M*Dt/Cp - M being the mass = flow of the coolant. Here is a link to one of the better non-technical discussion of all = aspects of cooling http://www.stewartcomponents.com/Tech_Tips.htm read Tech Tip #3 - Thermostats & Restrictors for a discussion about the = restriction myth FWIW Ed From: Jeff Whaley=20 Sent: Thursday, July 28, 2011 10:26 AM To: Rotary motors in aircraft=20 Subject: [FlyRotary] Coolant Restrictor Plate I saw Lynn's coolant diagram with a restrictor plate in it . you guys = with evaporator cores and 1" coolant hoses have a 1" restriction, this = based on Mazda's design of 1.5" inlet/outlet on the stock water pump and = the stock design includes a thermostat. With all of that as a = background (never had a thermostat), I decided to try a restrictor plate = in my coolant system, using a 0.75" hole in a plate at the water pump = outlet into my 1.5" radiator hoses. I can say that it doesn't do any = harm and may have actually provided about 5% improvement . more testing = to follow. =20 Jeff Whaley =20 This message, and the documents attached hereto, is intended only for = the addressee and may contain privileged or confidential information. = Any unauthorized disclosure is strictly prohibited. If you have received = this message in error, please notify us immediately so that we may = correct our internal records. Please then delete the original message. = Thank you. ------=_NextPart_000_0019_01CC4D14.1EA1D9F0 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
More details, Jeff?
 
From my reading on cooling systems, the only = time I have=20 read of an improvement in cooling using a restrictor plate is in the = case where=20 the water pump is cavitaing.  The restrictor plate improving = cooling in=20 that case because it produces more back pressure around the impeller and = eliminates/reduces the air bubble caused by cavitations. This = permits the=20 impeller to pump coolant rather than trying to pump air.
 
Otherwise, the old myth about restrictors/slow = water=20 cooling better is just that - a myth.
 
Now it may well be that a hose size larger than = 0.75" dia=20 is unnecessary for some installations and going above size that does not = really=20 increase flow rate or cooling, so not saying what you found to be in = error, but=20 just didn't want folks to think that restriction =3D better = cooling.
 
The basic equation for heat removal ('Q') = clearly shows=20 that more mass flow ('M') equals more heat removal.  Q =3D M*Dt/Cp - M being the mass flow  of the=20 coolant.
 
Here is a link to one of the better = non-technical=20 discussion of all aspects of cooling
 
http://www.stewar= tcomponents.com/Tech_Tips.htm
 
read Tech Tip #3 -=20 Thermostats & Restrictors for=20 a discussion about the restriction = myth
 
FWIW
 
Ed
 

 From: Jeff Whaley

Sent: Thursday, July 28, 2011 10:26 AM
Subject: [FlyRotary] Coolant Restrictor = Plate

I saw Lynn=92s coolant diagram with a restrictor = plate in=20 it  =85  you guys with evaporator cores and 1=94 coolant hoses = have a 1=94=20 restriction, this based on Mazda=92s design of 1.5=94 inlet/outlet on = the stock=20 water pump and the stock design includes a thermostat.  With all of = that as=20 a background (never had a thermostat), I decided to try a restrictor = plate=20  in my coolant system, using a 0.75=94 hole in a plate at the water = pump=20 outlet into my 1.5=94 radiator hoses.  I can say that it doesn=92t = do any harm=20 and may have actually provided about 5% improvement =85 more testing to=20 follow.

 

Jeff=20 Whaley

 


This message, and the documents attached hereto, is = intended only for=20 the addressee and may contain privileged or confidential information. = Any=20 unauthorized disclosure is strictly prohibited. If you have received = this=20 message in error, please notify us immediately so that we may correct = our=20 internal records. Please then delete the original message. Thank=20 you.
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