<VV> Thermister Swap?

[John Beck]

Wow,  it does look like a thermistor rather than a thermocouple.  I saw 
photos but no data sheet.  I wonder if the curve is anything like the 
Corvairs.  I thought about rebuilding some DOS (dead old stock) ones 
about ten years ago and couldn't find any bare, off the shelf 
thermistors that were close to the original curve.  Building additional 
electronics to match the curve seemed like way to much work so I lost 
interest.   This unit looks like they had the Corvair sensor in mind 
when they designed it.  --J.B.

Patrick via VirtualVairs 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
>
>