That's a great idea: two level sensors.
One to detect that you are loosing coolant (low coolant level at the waterpump)  and the other to detect blowby (higher than normal level in the overflow bottle).

Finn

Dale Rogers wrote:

>Jim Sower <canarder@frontiernet.net> wrote:
> >  >
>>>... Blowby from
>>>compression and/or combustion gasses forcing air into the coolant system
...
>>>
>>>      >>>
>
>  >
>>How long would it take a coolant pressure gauge to pick up on that one??
>>
>>    >>
>
>   That partly depends on how close your cap pressure is to >the actual operating pressure.  It shouldn't take long at >all for an compression/exhaust leak to raise coolant >pressure to the cap pressure.  So the change in coolant >pressure should be notable.
>
>   An easy sanity check is a variation on Perry Mick's >method, put a go/no-go "fluid level" detector in the overflow bottle (not
the recovery tank).  It should normally >be empty, or nearly so.  Exhaust in the coolant will fairly >quickly push some liquid past the pressure cap and trigger >the sensor.  Late 80's GM V-6's commonly use such a sensor >near the top of the radiator tank - I think the current >cost is about $35.00.
>
>Dale R.
>COZY MkIV-R #1254
>
>
>
>  >
>>> Homepage:  http://www.flyrotary.com/
>>> Archive:   http://lancaironline.net/lists/flyrotary/List.html
>>>      >>>
>
>
>  >