Landracing Forum
Tech Information => Technical Discussion => Topic started by: panic on August 27, 2005, 06:40:43 PM
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For Mod. class max WB is 68", yes?
Assuming that my stock WB is 54" and that I want to extend only the swing-arm, how to figure what length? Bike will only go 125-135.
Looks like longer = more stable but less traction?
Any site I should visit for ideas?
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Yup, much more stable. It is in my case, anyway. And that little annoyance of lofting the front went away.
I don't think wheelspin will be a problem until you hit the "aero wall."
You can always drill and fill with lead shot later, if needed.
Sam
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What's your old vs. new wheelbase?
How much added to the arm?
Any suspension mods to compensate for the diff in leverage against the shock, and weight dist. change?
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I added on 10 1/2 inches from a donor swingarm. Seems to be adjustable from 67 3/4 to 68 1/2 now. (wonder how that happened?) That left the shock mounts OEM (I use struts). And moved a lot of weight to the rear. Sorry, no numbers, but the lower-back-factor comfirms it.
Sam
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Unless the course is in great condition shocks may have better results than a rigid rear...
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Luckily (actually, some planning for a change) the swing-arm I'm using has parallel sections exactly 1" X 2" X .090"(? with paint), I'm going to patch in some 11 gauge (.110").
I assume it's good practice to close up the "nose" of the open area to about the same safe distance to the tire as stock (i.e., add 12", close off empty forward area by 12") to improve rigidity? Tire is about same OD as stock.
I'm going to retain the suspension - if my engineering/fabrication skills are up to it!
I see the small cross-section arms (like mine, as opposed to 'Busa, R1, etc.) generally have some bracing added both along the top or bottom and also in 3rd dimension above or below at the pivot.
Other than clearance to some part of the bike or surface, isn't a bottom brace stronger for the same amount of metal? IMHO if the welds are good a tube will be stiffer in tension (on the bottom, being stretched up) than compression (on the top, being "folded" in compression). Am I overlooking something?
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I wonder if history will repeat itself as in 2002.
Flooded in September and white concrete for the World Finals.
I'll be sure to bring my shocks next time, just in case.
Sam
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Yes white concrete would be nice..
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Yes white concrete would be nice..
:lol: we have "white concrete " all the time, only problem it only 100 miles long
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White concrete "only" 100 miles long---and that is a problem???? :D
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Yes white concrete would be nice..
:lol: we have "white concrete " all the time, only problem it only 100 miles long
No problem for us, we hope to see you next year in Oz... :wink: