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Mark,
You are correct about being counter intuative. Take a look at the view down the port on the left hand pic - last but one in the article Here you see the dam angled across the port 45 degrees. It looks like the dam would cause fuel to flow off it's edge and up to the left and on into the cylinder wall. This is not the case. As the fuel reaches the edge of the dam it shears off perprndicular to the dam's edge. That means it is directing fuel toward the middle of the cylinder not the chamber wall or cylinder wall as it first might seem. What we see here is the reason why we need to have both wet and dry flow benches. if the air and fuel always did what you expected we would not need either of these pieces of equipment.
Hope that sorts your dilema.
DV
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