<VV> Thermostats

[J R Read]

The "fail"position is open.
Later, JR

  ----- Original Message ----- 
  From: Jim Simpson 
  To: J R Read 
  Cc: Virtual Vairs 
  Sent: Tuesday, July 31, 2012 9:50 PM
  Subject: Re: <VV> Thermostats


  I used to be able to watch the right (passenger) side damper door close after shutting the engine down.  Yes, it has always definitely closed first, but now it seems to be on the verge of never opening -- or at least opening at a higher temperature.

  Perhaps I'm over reacting; I just drove back from Sturbridge (to Maryland) and in the ~90 temps near home, everything was hot...  I think I'll go ahead and swap in one of the reproduction thermostats and see what happens.

  Jim Simpson
  Group Corvair


  On Tue, Jul 31, 2012 at 9:54 PM, J R Read <hmlinc at sbcglobal.net> wrote:

    Jim,

    The left side opens first and closes last.  This is normal.

    It is probably not possible to stop the car and run to the RR fast enough to see that door still open.

    Later, JR


    ----- Original Message ----- From: "Jim Simpson" <simpsonj at verizon.net>
    To: "Virtual Vairs" <virtualvairs at corvair.org>
    Sent: Tuesday, July 31, 2012 7:10 PM

    Subject: <VV> Thermostats



      Does anyone know at what temperature the stock thermostats are supposed to
      open?  I can't find it in any of the standard references.  (One of the
      damper doors on my Corvair doesn't seem to open properly.  It's free to
      move, but lately even when the engine is hot, it seems to stay closed. And
      yes, it is adjusted according to the book.)

      Supposedly the thermostats are filled with one of the isomers of butyl
      alcohol but there are four varieties, each with a different boiling point.
      And the fill may be a mix.  Even if I knew which one, it's still a bit more
      complex since bellows is designed to fail open and therefore is under a
      partial vacuum when cold which would affect the boiling point.

      I've checked several reproduction thermostats and they start to expand in
      boiling water but not fully.  By contrast, the one I removed from the car
      -- a GM original -- doesn't show any signs of expanding in boiling water.

      Jim Simpson
      Group Corvair
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