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Originally Posted by Cathar
Made a cut-out that is about 1.5mm larger on each edge over the Barton AthlonXP core size (i.e. an 17x10mm rectangle). It effectively blocks off about half of the tubes. The blocked off tubes do receive a small amount of flow as the water flows through the chamfers between the jet intakes.
After some testing, I'm seeing basically at least a full 0.5C improvement with the Iwaki MD30-RZ pump, which I guess is about as much as I would expect..
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Blocking off 50% of the jets should make even a bigger difference at lower flow rates. You should get double the velocity at the same flow rate so the cascade may give near the same performance at .5 gpm that it does at 1 gpm without the blockage. This would amount to 1C according to pHaestus' results