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Date: Mon, 28 Feb 2005 14:46:49 -0600
From: Jim Sower <canarder@frontiernet.net>
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To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Subject: Re: [FlyRotary] Re: Filterr or not to Filter: FW: Cooling system
 update
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<... Never any sign of corrosion or blockage in spite of ...>

That's encouraging.  Have you ever inspected your radiator tanks for 
sediment and stuff? 

Guess the key is clean coolant with no active agents ... Jim S.


Tracy Crook wrote:

> 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). 
>  
> 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. 
>  
> 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 -----
>     *From:* Ed Anderson <mailto:eanderson@carolina.rr.com>
>     *To:* Rotary motors in aircraft <mailto:flyrotary@lancaironline.net>
>     *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" <sqpilot@bellsouth.net <mailto:sqpilot@bellsouth.net>>
>     To: "Rotary motors in aircraft" <flyrotary@lancaironline.net
>     <mailto:flyrotary@lancaironline.net>>
>     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
>     >
>