TR6 Electric Fan help needed for TR6

[hondo402000]

I am adding an electric fan, doing away with the yellow fan on my 71 TR6, I have the fan mounted to the Radiator as a puller, my question is their are 2 types of sensors to turn the fan on, one that appears to go in the cooling system somewhere and one that has a probe that sticks in the radiator fins, anyone have a suggestion as which one is better?
Since I have webers I dont have a heated intake manifold and I could use that port for the sensor that goes into the head, however most probes are 3/8 NPT and I am sure that port is not a NPT thread, I could rethread it, I put an aluminum water pump housing on the engine too so taping AL is much easier
Hondo

 

[3798j]

From my own experience with the probe mounted in the radiator fins on my resto-modded '55 F100, the fan didn't come on early enough. The engine water temperature would get higher than I liked before the probe turned the fan on. Then the fan ran longer than I thought necessary to bring the temp back in line. Since this only was a problem sitting in traffic, I added a dash mounted toggle switch which allows me to turn the fan on as soon as I see the temps start to creep - getting a jump on the rising temp before it's a concern. It's become automatic for me to glance at the gauge - then hit the switch.

 

[poolboy]

The 2 TR6's I've owned had the sensor in different locations, neither seemed better than the other.
One was in a bung on the top right of the radiator; the other in a bung in the lower metal radiator pipe.
I'd think the fin mounted one would be under a lot of influence of the ambient temperature as opposed to totally influenced by the coolant temperature.
A cockpit mounted override switch is also a good idea, like Jay said, if you anticipate traffic conjestion, get a head start on the cooling process.

 

[TexasKnucklehead]

I have a fan mounted as a pusher, and a probe through the radiator fins on my 74 TR6 (at the top near the hose). I did not remove the red plastic fan. The engine temperature is of concern only when in stop-n-go traffic, when it's hot. The temperature does rise before it turns on, and it does seem to run a long time before shutting it off, but since it's hot, I don't think it's such a bad idea. It doesn't overheat, or come close, and that's all I'm worried about.

I know there are some probes available that allow you to select the on/off point, but I'm happy with mine the way it is. If the ambient temperature is below 90, the electric fan does not come on -but I've never tried to qualify exactly how hot it needs to be before it does comes on.

 

[Brosky]

Mine is a 185 sensor located in the top of the radiator. That works fine for me.

 

[hondo402000]

thanks all, I can take it from here unless more chime in

Hondo