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Synchro909 · 07-15-2014, 07:53 AM

Bill and Brobrian, I have heard the theory about water circulating too fast to get rid of the heat because it is not in the radiator long enough. I'm doubtful about that and would like to hear the opinion of others.
Here's why I'm doubtful.
If the water is circulating fast enough to spend too short a short time in the radiator to cool, then it is circulating fast enough that it is circulating through the block for too short a time to get hot. Put another way, the temperature of the engine is stable only when the heat being dissipated by the radiator matches the heat produced by the motor. Within limits, I suspect that water speed doesn't matter.
I'd like to see one of those infrared thermometers used to check the temp at top and bottom of the radiator on a car with fast moving water and again with it circulating at a lower speed.

07-15-2014, 07:53 AM	#32
Synchro909 Senior Member Join Date: Jun 2014 Location: Melbourne, Australia Posts: 7,496	Re: rebuilt water pump runs hot Bill and Brobrian, I have heard the theory about water circulating too fast to get rid of the heat because it is not in the radiator long enough. I'm doubtful about that and would like to hear the opinion of others. Here's why I'm doubtful. If the water is circulating fast enough to spend too short a short time in the radiator to cool, then it is circulating fast enough that it is circulating through the block for too short a time to get hot. Put another way, the temperature of the engine is stable only when the heat being dissipated by the radiator matches the heat produced by the motor. Within limits, I suspect that water speed doesn't matter. I'd like to see one of those infrared thermometers used to check the temp at top and bottom of the radiator on a car with fast moving water and again with it circulating at a lower speed.