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Yamaha MX & Off-Road Dirt Bikes
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[QUOTE="DualSportr, post: 156119, member: 19592"] Rich, a little help here??? I could respond to Aust520exc, but I'm hoping Professor Rohrich will take us all to school :p okay, okay, just one question Aust -- where, exactly, is the modern four stroke gaining the additional rotating mass? The crank? Nope, same or lighter than a two stroke of similar displacement. The flywheel? Not on the modern thumpers I've seen. Clutch - those are normally more beefy, that's correct - they make them bigger to handle the increased TORQUE of the four stroke - you know, that non-existent torque we're talking about. Oh, the valve train, yes, the additional rotating mass of moving the valves. That's like adding a whole four or five ounces to a flywheel at least! Okay, by your theory then, a counter balanced two stroke will feel more....er....torquey....than a non counter balanced two stroke of the same displacement. Since the counter balanced engine has all that extra rotating mass....er...."storing" energy. Is this a valid argument? I'm wondering - have you been dyno testing these engines a bunch, and extrapolating data from these tests? I hope you've been using a hydro style dyno, since the drum dyno does not actually test torque. I really want to see this data, since it's counter-intuitive to every test I've seen in the last 5 years. [/QUOTE]
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Dirt Bike Discussions By Brand
Yamaha MX & Off-Road Dirt Bikes
Grunt??
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