Hi Tony,
Check out Stewart Components. Their website has (had? I can't find it just
now) a very informative FAQ as well as this online forum:
http://www.stewartcomponents.com/cgi-bin/yabb/YaBB.cgi#general_cat
Where you can ask questions.
The current thinking is that you need turbulent flow to maximize the heat
transfer efficiency of the cooling system, so it is important to maintain
enough water flow under all conditions. The most difficult scenario in this
case is idle, where the engine speed and the water pump speed are low.
Theo
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