quote:
Originally posted by JFB #05177:
... your illustration shows the vent on the far common tank, thus there will be a slighly higher pressure here than if it was on the exit tank. Is that intentional? ...
Yes
quote:
Originally posted by JFB #05177:
... Is there an adaptor to use the more common threaded switches ...
Since the radiator is being rebuilt, I would personally have the OEM temp switch "bungs" removed from the radiator and replaced with M22 threaded "bungs" rather than to use an adapter. I'm sure the M22 threaded bungs are available.
quote:
Originally posted by JFB #05177:
... I was thinking if the switch was located in the outlet tank, it could determine if there was air flow causing the exiting fluid to be cooler than the thermostat regulated radiator inlet temp and thus start and stop the fan based upon car speed. it appears the original design's intent was to do this (with a 10c and 20c drop for a 192F thermostat), but the horizonal tank baffle modification defeated that for one of the switches. Is there experance to indicate this does not work? ...
I pondered this question myself. I have no experience with the temp switch installed in the outlet tank, other than Panteras. And that was a bad example
. But I know for certain that mounting the temp switch in the inlet tank works. I checked-out various older European cars (with emphasis given to the way the Germans do it) and found they installed the temp switch in the inlet tank. It occurred to me the thermostat and the fan switch comprise a closed loop control system, and from that perspective mounting the temp switch in the inlet tank makes more sense. In that configurations there is less time lag between the action of the thermostat and the fan control, and they are working together to control the same variable, i.e. the temp of the coolant exiting the engine block. The fans won't turn on until the thermostat has opened fairly wide, and that alone has proven insufficient to control the engine outlet temp. I can't say if that's why the OEMs chose to do it that way, but it would be my best guess.
Installing the switch in the outlet tank may sense the temp rise sooner, but now the fan control and the thermostat are attempting to control two different variables; i.e. one the radiator outlet temp and the other the engine outlet temp. You could get into a situation where the dog is chasing its own tail (control oscillation).
Best wishes for success what ever direction you decide to take.