Quote:
Originally Posted by bdentremont
Under ordinary conditions of radiator-limited cooling, I'm sure ctlikon0712 is right. However, if you run a thermostat in the top tube, what you might miss is feedback on it's function. If the thermostat stuck closed, the engine and the water leaving it would get unusually hot, so a top tube thermometer would indicate a problem. However, with the radiator functioning perfectly well, your water return temperature would be normal or even a little cool due to less total heat being put in the radiator.
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I think the above is a good analysis.
I remember puzzling over this when Charlie Yapp first came out with the modified inlet--he's a sharp fellow, but I still don't get it--I think he had more in mind than just a fun source of comparison data for the real, i.e, upper, gauge. I wonder if someone can describe for us a scenario problem for which the lower-mounted temperature sensor will be any help at all? It seems to me that that sensor will be the last to know.
Steve