Well I'll throw in the towel on this one. I was wrong. Though this illlustrates the purpose of forums. I threw an idea out there, we discussed it, and we sort of have a conclusion. This explains why koolance's diminuitive pumps are able to force water through relatively large loops (think of their full tower with four blcoks in series). So far the consensus is that only pressure drops and friction would inhibit flow in a closed loop, not necessarily the height of certain components relative to the pump. Anyone else have something to add?
If friction is a concern in closed loops do I hear some votes for 45 degree inlets and outlets on water blocks? Always something I wanted to try but have never had the time....
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