Quote:
Originally posted by MadDogMe
I think more could be gained just from using 5/8 barbs with 12mm inner diametre tubing, to gain the fullest from the flow we have. matching block~channels to bore diametres of tube ect.
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BigBen, can you explain flow rate and flow speed?, I think I'd rather have as much 'mass' of water moving through as quickly as possible  .
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Well then you want a high pressure pump, which don't come cheap.
People often think flow rate is best, but really it's water velocity that counts more than flow rate. Extra flow rate does help, but only because it increases the water velocity.
It is possible to boost water velocity by about 4x easily by adding restrictions are important sections of the block and still not have flow rates tumble much.
Having high flow rates and high velocity can be done, but only by having a very large and powerful pump which will in itself add so much heat to the water that it simply stops being beneficial.
As with most things in life, there's a balance and that balance (in my mind) would be a ~30-40W pump rated for around 15lpm (~4gpm) but with as great of a pressure head as is feasible given the motor power output and a well designed impeller.
Stick that onto a block that forced the water to go through ~20mm^2 of openings boosting water velocity to about 4-5x what is typical in most of today's blocks, and you'd probably still see around 2.5-3gpm flow rates with 1/2" tubing/barbs feeding the water.
ie. it hinges on the pump.