Pins superior to fins? I think so. I remember JD being of the same opinion. The MCW6000 series is a center inelt pin block that performs exceptionally well. What you need is a practical viewpoint. Pines might be too difficult for you to cut, and they might not improve performance enough to make a difference. If your flow is low, less than .5gpm, I'd say that pins would improve performance substantially. If your flow is above 1gpm I don't think the performance increase would be worth it. Look at the flow vs. CW curves of the WW and the MCW6000 to aid your decision. This will tell you if pins are worth the effort.
To the pros: don't you have to worry about Laminar flow if you get your pins spacing too narrow and/or too deep/shallow?
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