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Yeah, HD motors are a real dichotomy of design. An undersquare motor with a very long stroke, very low operating rpm's, they should have a vastly different intake tract. That said, the improvements made in the Evo, TC, and now Milwaukee Eight designs have been moving them in the right direction.
Take a look at any old Ironhead Sportster, Shovel, or Pan for examples of the very worst of the worse. Tremendously oversized ports and valves for the displacement and rpm's they have to feed. One has to wonder what on earth they were thinking.
The last Buells, with the intake up under where the gas tank normally is (the gas was carried the the big aluminum frame) were the best they ever did. That design carried through to the XR1200's as well. The Buells made the best power of any Harley motor ever made.
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Jeff
'72 911T 3.0 MFI
'93 Ducati 900 Super Sport
"God invented whiskey so the Irish wouldn't rule the world"
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