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Re: [T3] Thermostats


>>Were the ones that Bob saw failed in the closed
position, possibly some of the brazilian made ones
that depended on a bi-metal type spring?? 
They do fail in the closed position.<<
Just the other day I saw a good writeup on the
Brazilian thermostats (I think it was on Samba). 
Somebody had disected one to see how they work.  Turns
out it's a wax-motor type.  There's a plunger
surrounded by a rubber bladder, surrounded by wax,
surrounded by the metal case.  It turns out the big
spring is there to MAKE THE PLUNGER RETRACT!  So, yes,
they will fail closed when the wax leaks out.  Too bad
it's not a bi-metal.  Then it would be almost
bulletproof.

Any metallurgists on the list up for producing a new
bi-metal thermostat for us?

Tony Rongey
'70 Fasty (in progress)

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