Return-Path: Received: from [65.54.169.53] (HELO hotmail.com) by logan.com (CommuniGate Pro SMTP 4.3c2) with ESMTP id 762863 for flyrotary@lancaironline.net; Mon, 28 Feb 2005 12:09:48 -0500 Received-SPF: pass receiver=logan.com; client-ip=65.54.169.53; envelope-from=lors01@msn.com Received: from mail pickup service by hotmail.com with Microsoft SMTPSVC; Mon, 28 Feb 2005 09:09:00 -0800 Message-ID: Received: from 4.174.0.238 by BAY3-DAV23.phx.gbl with DAV; Mon, 28 Feb 2005 17:08:56 +0000 X-Originating-IP: [4.174.0.238] X-Originating-Email: [lors01@msn.com] X-Sender: lors01@msn.com From: "Tracy Crook" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] Filterr or not to Filter: FW: Cooling system update Date: Mon, 28 Feb 2005 12:08:52 -0500 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_001A_01C51D8E.44B6A830" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: MSN 9 Seal-Send-Time: Mon, 28 Feb 2005 12:08:52 -0500 X-MimeOLE: Produced By MSN MimeOLE V9.10.0011.1703 X-OriginalArrivalTime: 28 Feb 2005 17:09:00.0352 (UTC) FILETIME=[32361400:01C51DB8] This is a multi-part message in MIME format. ------=_NextPart_000_001A_01C51D8E.44B6A830 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Good points Ed. Remember that the normal coolant flow is on the order = of 30 - 40 GPM. That's a lot of water, so don't use a filter that will = be too restrictive (if you must do it at all). =20 My evaporator cores are 1970s vintage and never changed. I used 50-50 = Preston and distilled water for the first 3 years (no changes of = coolant during that time) and Dexcool (Sp?) long life (the red stuff) = and distilled water for the last 9 years. Never any sign of corrosion = or blockage in spite of the silly stories circulating about the = incompatibility of Dexcool & similar long life coolants with aluminum. =20 I do know of several cases of blocked rads from engines that had sat = around for extended periods with coolant (or plain water) in them. = Several were the 'brand new' turbo II engines obtained from various = sources. If you start with clean systems and use any good coolant and distilled = water, there is no reason to expect corrosion. Tracy ----- Original Message -----=20 From: Ed Anderson=20 To: Rotary motors in aircraft=20 Sent: Monday, February 28, 2005 7:45 AM Subject: [FlyRotary] Filterr or not to Filter: [FlyRotary] Re: FW: = Cooling system update One thing to consider anytime you place a filter or screen in any = fluid flow line where you might expect contamination (otherwise why put the = filter) is that should the filter become clogged - then all fluid flow ceases. = Not to say a filter/screen should not be used, however, its my opinion that = the source of the clogging elements should be determined forthwith = otherwise the condition will simply return. I have not had any problems with clogging or scale etc. I use Preston Antifreeze and Distilled water when I fill the coolant system. I am fairly certain that neither has Tracy with over 1600 hours - so = it clearly does not happen as a matter of course. Some tap water = (Particularly in the western part of the country) has a high gypsum? and other scale producing mineral content. I took out the thermostat to preclude interference with coolant flow = and perhaps that may contribute to more constant flow and perhaps less opportunity for scale to build up? Just a thought. Ed A ----- Original Message ----- From: "Paul" > To: "Rotary motors in aircraft" = > Sent: Monday, February 28, 2005 7:30 AM Subject: [FlyRotary] Re: FW: Cooling system update > Good idea. Unfortunately, I have all Stainless hose with AN = fittings. Would > like to see one with male/female -16 AN fittings that could be = placed > in-line. For those who are considering rubber radiator hoses, = however this > would be a nice to have item. Paul Conner > ------=_NextPart_000_001A_01C51D8E.44B6A830 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
Good points Ed.  Remember that the normal coolant flow is on = the order=20 of 30 - 40 GPM.  That's a lot of water, so don't use a filter that = will be=20 too restrictive (if you must do it at all). 
 
My evaporator cores are 1970s vintage and never changed.  = I used=20 50-50 Preston and distilled water  for the first 3 years (no = changes of=20 coolant during that time) and Dexcool (Sp?) long life (the red stuff) = and=20 distilled water for the last 9 years.  Never any sign of corrosion = or=20 blockage in spite of the silly stories circulating about the = incompatibility of=20 Dexcool & similar long life coolants with aluminum. 
 
I do know of several cases of blocked rads from engines that had = sat around=20 for extended periods with coolant (or plain water) in them.  = Several were=20 the 'brand new' turbo II engines obtained from various sources.
 
If you start with clean systems and use any good coolant and = distilled=20 water, there is no reason to expect corrosion.
 
Tracy
----- Original Message -----
From: Ed Anderson
To: Rotary motors in = aircraft
Sent: Monday, February 28, 2005 = 7:45=20 AM
Subject: [FlyRotary] Filterr or = not to=20 Filter: [FlyRotary] Re: FW: Cooling system update

One thing to consider anytime you place a filter or = screen in=20 any fluid flow
line where you might expect contamination (otherwise = why put=20 the filter) is
that should the filter become clogged - then all = fluid flow=20 ceases.  Not to
say a filter/screen should not be used, = however, its=20 my opinion that the
source of the clogging elements should be = determined=20 forthwith otherwise the
condition will simply return.

I have = not had=20 any problems with clogging or scale etc.  I use = Preston
Antifreeze and=20 Distilled water when I fill the coolant system.
I am fairly certain = that=20 neither has Tracy with over 1600 hours - so it
clearly does not = happen as a=20 matter of course.  Some tap water (Particularly
in the western = part of=20 the country) has a high gypsum? and other scale
producing mineral=20 content.

I took out the thermostat to preclude interference = with=20 coolant flow and
perhaps that may contribute to more constant flow = and=20 perhaps less
opportunity for scale to build up?  Just a=20 thought.

Ed A


----- Original Message -----
From: = "Paul"=20 <sqpilot@bellsouth.net>
To= :=20 "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Sent:=20 Monday, February 28, 2005 7:30 AM
Subject: [FlyRotary] Re: FW: = Cooling=20 system update


> Good idea. Unfortunately, I have all = Stainless=20 hose with AN fittings.
Would
> like to see one with = male/female -16=20 AN fittings that could be placed
> in-line.  For those who = are=20 considering rubber radiator hoses, however
this
> would be a = nice to=20 have item. Paul Conner
>
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