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Dirt Bike Mods & Maintenance
Motorcycle Myth # 5 - You need big ports to make big horsepower
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[QUOTE="motometal, post: 1451347, member: 24727"] Thanks for sharing your knowledge Rich! Long time no talk. Can you expand on how velocity in the port is important? I think it relates to momentum of the charge forcing more air (or charge) into the chamber but why is an optimized port with its higher velocity superior to a larger port? With the larger port the charge may have to speed up as it approaches the valve. Is that the issue? I relate this a little to the chimney on a woodburning stove. Most folks say if the cross sectional area is too large, you won't get as much draw, but I haven't quite grasped why. With the larger one, velocity is reduced but why wouldn't the larger cross section compensate for this? Also, has there been any rumblings about VVT/VCT for off road bikes? Forgive me if this has been in the press as I don't keep up with magazines etc. these days. [/QUOTE]
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Motorcycle Myth # 5 - You need big ports to make big horsepower
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