<VV> Thermister Swap?

MarK Durham 62vair at gmail.com
Fri Aug 29 22:50:49 EDT 2014


Patrick. Send me the catalog page so a comparison can be done. Does anyone
have the ohm readings for the std part cold to hot?
Mark Durham Hauser, Idaho
On Aug 29, 2014 7:06 PM, "Patrick via VirtualVairs" <
virtualvairs at corvair.org> wrote:

> To all, I have discovered that the connecting shaft or tip  on my
> thermister spins freely. I cannot tighten the small nut on the  wire. In
> addition, I
> have no reading at all on the gauge and I am  unable to gain any resistance
> when I do an Ohm test on the unit. I am thinking  that whatever wiring the
> tip is connected to beneath the porcelain has  broken resulting in a failed
> thermister.
>
> Now, I have located used original AC ones (tested) for around  $80, and
> there is a NOS thermister on eBay now for $400. Interestingly, as  I
> researched
> even further I have found info on a Rochester 3080-38  TEMPERATURE PROBE
> referenced from a FlyCorvair.com article on head temps.  In the aircraft
> catalog mentioned in the article their  Rochester thermister/temp probe
> has a
> temp rating from 250F - 550F  degrees, and it has 3/8 24 thread size, the
> same
> as the one I recovered from my  Spyder. Also, it appears DC because it is
> used in light aircraft  perhaps Corvair powered too. Cost of the new
> Rochester
> temperature  probe is $80.
>
> Question: Will this thermister work in my Spyder, is it compatible  with
> the factory gauge and CHT opening on the head?
>
> (I do not have the measurements of the Rochester temp probe but it looks
> very close to our AC unit from the picture in the catalog)
>
> Patrick
> 64 Spyder Coupe
> Metro Detroit, MI
>
>
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