I think we are beating around the bush but not quite nailing it down. Using
standard pumps water cannot travel too fast in a radiator. In an automotive
cooling system, I doubt there is any laminar flow. It's all turbulent.
Having a restrictor or T-stat helps keep the water pressure in the block
significantly higher than near the cap or in the radiator. The pump's
output, coupled with the pressure rise due to the heating of the coolant
causes a rise in pressure due to the restriction of the t-stat. This
increase in pressure, minimizes the localized boiling (higher pressure
inhibits boiling) which can result in steam creation and rapid overheating.
Some restriction in the t-stat housing is required. How much is the
question.
Jack
TR's 3&8
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