Ah, and Cova, that is the hell of it. The reason people with big rads do well is that not only can they have faster flow, but they keep their coolant in there longer. I see your point, though. Your best bet in those systems is a slow flow system that, say, has the equivalent flow diameter of 1-1.5" hosing on your .5" system. While your pressure will remain high, you'll have a maximum amount of water in it at a time. That is similar to what happens in your car. The downside of a rad like that is that they are large (this is why I suggested the full size radiator in my previous example as a good idea ... maximum time for cooling).
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