Lamiflow. I'm glad to see someone managed to make one, and well. I'd tried to build such a block but with a configuration too ambitious (different port locations, tapered channels). It would be cheap to produce in quantity though as the parts could be stamped.
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Your grandad ought to check into these forums, jungle.
He's right, I think - the main thing is to rub that boundary layer off. You do that with restriction, one way or another. So long as people use impeller pumps to push water through blocks of the tolerances we're used to, that means high flow rate translated briefly into higher pressure in the block.
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