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Ol'Ron >>Some Good shapes were beyond my ability to make them.>>>
What your grandson's simulation might be trying to point out is that a small diameter nearly straight pipe might actually flow better than a big fat bendy port by eliminating most that big turbulent dead zone and backflows presumably caused by that big fat 90° elbow. You should be able to make a straighter port out of tubing or sheet metal that'll fit inside that big bendy port Ol'Ron. You can do it. 
