About the same for me.  I have about 10 years on silicone heater hose.  The truckers use this stuff for a million miles before changing.

Tracy

On Mon, Sep 13, 2010 at 4:40 PM, Charlie England <ceengland@bellsouth.net> wrote:

 Yes, there is occasionally method to my madness.

I figured Ed had you beat, but I'm pretty sure there's someone else with even more hours, if not calendar time, on high quality automotive hoses.

Charlie

On 9/13/2010 2:33 PM, Ed Anderson wrote:

'Frad not Dave,
My SS radiator hoses (AN-16) have over 10 years on them - no replacement, no leaks (so far).  However, were I to do it again, I would probably not go SS due to cost and weight - but reliability has been absolutely great.
Ed
Edward L. Anderson
Anderson Electronic Enterprises LLC
305 Reefton Road
Weddington, NC 28104
http://www.andersonee.com
http://www.eicommander.com

*From:* David Leonard <mailto:wdleonard@gmail.com>
*Sent:* Monday, September 13, 2010 3:19 PM
*To:* Rotary motors in aircraft <mailto:flyrotary@lancaironline.net>
*Subject:* [FlyRotary] Re: Scheduled hose replacement



On Mon, Sep 13, 2010 at 11:53 AM, Charlie England <ceengland@bellsouth.net <mailto:ceengland@bellsouth.net>> wrote:

    On 9/13/2010 1:02 PM, David Leonard wrote:



          *The radiator manufacturer will have a maximum number based
       on how

          stiff the flat sided tubes are. Too much pressure rounds those
          tubes and then pulls them loose from the fins when pressure is
          removed. Also the rounded tubes slow airflow through the
       radiator. *
          *Racing radiators tend to have higher pressure ratings than
       auto
          radiators. *
          *Most racers run 16 to 22 pound caps. Higher pressure means
       higher
          boiling temp for the coolant.  Also more stress on the
          connections. With a 2" hose and 22 pounds you have just
       about 70
          pounds trying to pull the hose off of the fitting. With
       silicone
          hose and safety wired clamps it would not be a factor. That
       does
          not include Chinese replica clamps. Just real American made
       name
          brand clamps. You can also use real aircraft quality clamps
          already drilled for safety wire. *
          *Many modern cars use no pressure cap. Just a sealing
       filler cap
          on a make up bottle.*
          *An air space above the coolant level provides a volume of
       air to
          compress to control the pressure. If the moron at the gas
       station
          fills that bottle all the way up while reading the message
       on the
          bottle not to fill above this line,*
          *the end tank will blow off of the radiator just like on my
       wife's
          car. *
          **
          *The 22 pound cap is middle ground, a bit more insurance, not
          likely to hurt the radiator. *
          **
          *I use 22 pounds. Distilled water with 10% glycol and either
          Redline Water Wetter or 1/2 teaspoon full of dish washing
          detergent. It is gentle on the hands. Never a problem since
       1980.*
          *Lynn E. Hanover*


       Hey Lynn and the rest of you smart guys, What is your opinion
       on scheduled hose replacement?  My plane has been flying for 6
       years now and I just finished the annual.  I decided that 6
       years was long enough on some of my radiator hose and decided
       to replace it.  In particular, I ordered up the AN-16 steel
       braided hose (Earls Perform-o-flex)  for my coolant out line
       but I just couldn't bear the thought of cutting and fitting
       that stuff and hoping I don't get leaks or damage the AN hose
       fittings or cut my fingers to shreds.  So I decided the
       current hoses were good for another year.  Maybe a
       justification...

       Opinions on scheduled replacement of SS hose?

       --         David Leonard

       Turbo Rotary RV-6 N4VY
       http://N4VY.RotaryRoster.net <http://n4vy.rotaryroster.net/>
       http://RotaryRoster.net <http://rotaryroster.net/>

   I would copy the guy with the most trouble free hours on his
   coolant hoses. :-)

   Charlie

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Nice Charlie,

For braided SS in aircraft use, that might be me..  Guess I just keep going until I land on another highway...  ;-)
--
David Leonard

Turbo Rotary RV-6 N4VY
http://N4VY.RotaryRoster.net
http://RotaryRoster.net

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