<VV> Head Temp Sensor

[Sethracer at aol.com]

Mark - I know the guy asked for a recommendation. What I was trying to  do 
was help him out if he had a working gauge but a non-working sender. He 
might  even have the VDO in the buggy. In that case a new thermocouple and wire 
would  do it. If it is an old Stewart Warner- It would be a tougher quest. I 
am putting  the VDO gauge (in my gauge plates) in a Corsa dash (into a 
street Monza),  because I had a few other matching VDO gauges. I actually prefer 
the  Westach head temp gauge and thermocouples, because of the better 
mounting system  on the head. If the response is critical, I would go with these. 
I still  haven't seen a response from GaryB on which gauge he has now.  
-Seth  
 
 
In a message dated 7/10/2015 2:43:23 P.M. Pacific Daylight Time,  
virtualvairs at corvair.org writes:

You  cannot switch from one type to another sensor with the same gauge  or
wiring. Neither systems parts are compatible with the other. They  operate
on totally different principles.

The Thermocouple system is  independent and does not rely on the car's
electrical system other than for  a light for the gauge, if installed.
Dis-similar metals in the copper ring  generate and send varying voltages to
the gauge as the temperature changes.  The wiring harness is a part of the
thermocouple and must not be tampered  with.

The thermister system is no different than other gauges.Power  goes through
the gauge, down the wire and through the thermister to ground.  The amount
of current that flows (that moves the gauge needle) depends on  the
temperature of the thermister.

Just get a VDO system, make sure  you order the correct length thermocouple
wiring for your application, and  install it all. Find a bolt (preferrably
stainless steel to avoid corrosion  issues) with the correct thread for the
thermister hole, use a stainless  steel wide washer that will cover the
thermocouple fully on top of the  copper thermocouple, and tighten it up on
the head surface. The bolt will  transfer heat from the same threads the
thermister would use, as well as  contact with the head surface, and you
should get fairly reliable accuracy  out of the kit.


Mark Durham
Hauser, Idaho
62 Monza coupe  Red/Red 4 speed

On Fri, Jul 10, 2015 at 9:31 AM, frankcb--- via  VirtualVairs <
virtualvairs at corvair.org> wrote:

>
>  JR and Barry,
> `    I suspect that the thermistor type setup  (like the stock Corvair
> 140/180) depends on the resistance of the  thermistor probe changing with
> temperature, so the gauge is setup to  respond to that.  But the 
spark-plug
> type depends on a  thermoelectrical signal sent from the part under the 
plug
> back to the  gauge.  So I question if you can switch senders from one type
> to  another without switching gauges to the type that the specific sender
>  requires.
>     Maybe someone who really knows this stuff  will jump in here to respo
nd.
> Frank Burkhard
> Boonton,  NJ
>
>
> -----Original Message-----
> From: J. R. Read  via VirtualVairs <virtualvairs at corvair.org>
> To: Gary Berry  <duallycc at gmail.com>; Virtual Vairs <
>  VirtualVairs at corvair.org>
> Sent: Thu, Jul 9, 2015 8:07 pm
>  Subject: Re: <VV> Head Temp Sensor
>
>
> Uhh, a  themirster - in the original spot?
> Later, JR
>
> -----  Original Message
> -----
> From: "Gary Berry via VirtualVairs"  <virtualvairs at corvair.org>
> To:
> "Virtual Vairs"  <VirtualVairs at corvair.org>
> Sent: Thursday, July 09, 2015  5:09
> PM
> Subject: <VV> Head Temp  Sensor
>
>
> > Hey All;
> >
>  >   I have an old head
> temperature gauge in my buggy that  has the actual
> > sensor under one of the
> sparkplugs. It  doesn't work anymore. I would like
> > to replace this with a  new
> modern one. Any recommendations? Anything
> >  rather
> > than under the
> sparkplug? Thanks.
>  >
> > --
> > GaryB in Wa.
> > 1969  ManxVair
> > 1971 Corvair
> Turista
> >  _______________________________________________
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