How does the PRT work?
Conventional thermostats – as fitted to all MGFs and early MGTFs – open purely in response to temperature on the inlet side. As temperature of the engine increases, the thermostat bulb moves to allow flow through the thermostat to permit the entry of cold water into the engine. The PRT is a little different. A PRT thermostat, in addition to opening in response to temperature, will also open its value in a manner related to engine speed – which is rather given away by its name (PR = pressure relief). In effect, this is predicting a temperature rise, as increasing engine speed means that the engine is producing more power, and more power invariably means more heat that the cooling system will have to deal with. This opening of the PRT is accomplished by a simple comparison of inlet and outlet pressure, which is achieved mechanically by a balancing spring. When the engine’s water pump spins faster (with higher engine rpm – remember it is mechanically driven off the cam belt) its inlet pre
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