<VV> Cylinder head temperature switch

[BobHelt at aol.com]

Dave,
The overheat switch was set at 450 degrees starting in  1961.
Bob Helt
 
 
In a message dated 3/2/2016 10:04:56 A.M. US Mountain Standard Time,  
virtualvairs at corvair.org writes:

525 for  the "regular" cars, 575 for turbo, 140 and AC.  It's seems clear
that  GM knew that the high performance engines (turbo and 140) had a
tendency to  overheat.  They discovered this, no doubt, during
pre-production  testing.  The logical thing to have done would have
been to  >improve
the cooling, but that would have cost time and money.   Instead, hey took
the cheap and easy way out, and simply increased the  actuation
temperature of the snap switch from 525F to 575F for those  engines
(and AC cars).
If 575F is a safe operating limit for the high  performance and AC cars, why
isn't it safe for the other cars?  It  costs money to use two different part
numbers.
>The use of a 575F  snap switch is, in my opinion, one of the reasons for
the high rate of  dropped seats in the 140 engines.  You can run your 140
just below  575F for long periods and for multiple cycles and never know
it.  The  turbos at least had a CHT gauge.  525F is unreasonably high, but
575F  is very high.  Clearly, GM knew that the high performance engines  ran
hotter, but felt that setting the over-temperature indication just  short of
meltdown was a satisfactory solution.


Dave  Keillor

On Wed, Mar 2, 2016 at 10:29 AM, Jim Simpson via VirtualVairs  <
virtualvairs at corvair.org> wrote:

> Other than the  mounting threads, what is the difference between the
> "regular" Corvair  cylinder head temperature switch and the Corsa
> (140/turbo) head temp  switch?  I seem to recall claims that they operated
> at different  temperatures (the Corsa version being higher), but I can't
> seem to  find anywhere that's documented.
>
> Anyone know for sure and  where to find it?
>
> Jim Simpson
> Group  Corvair
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