Quote:
Originally posted by gone_fishin
High flow leads to more turbulence and more velocity. When you use a large pump with a restrictive block then you are going to be at or near it's maximum allowable volumetric flow rate which it will perform better with. A block design that allows even higher flow rates will take advantage of it with an even higher flow rate. Velocity increase goes hand in hand with increased volumetric flow.
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Yes, a higher flow rate created by the pump with all other factors constant should increase flow speed in the entire loop, but a narrow channel in the block will increase flow speed in just the block while reducing flow rate for the entire loop. This is probably appreciated by the rad, but not by the pump, which has to start fighting backpressure and gets noisy.
On the other hand, a narrow channel in the block also reduces the volume of water that is in the block at any given time, which I would think is a downside.
So..which is the better way to go...1/2" tubing with a fairly narrow block or a wider channel block?