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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Modified Steering Stem
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<blockquote data-quote="Chris Launders" data-source="post: 79223" data-attributes="member: 2010"><p>Gentlemen can you put your thinking caps on about this please, just to satisfy a puzzle I've had, when I fitted needle rollers to the bottom links instead of bushes I expected to have to increase the damping to compensate for the reduced friction but I've had to increase the spring rate as well quite a bit to stop the forks bottoming out.</p><p></p><p>Now an idea has lodged itself in my head that the friction of the link bushes increases as the angle increases, now this may seem strange but I think it works like this;</p><p></p><p>To simplify things, say the fork action is vertical and the links are around horizontal, the action is purely rotational, but as the angle increases a proportion of the forces acting upwards pulls against the bottom of the eccentric increasing the pressure, the extreme of this is if in theory the link could achieve the vertical ALL the forces exerted upwards would be pressing against the bush/eccentric and there would be no rotation, so we have gone from a position of low pressure/ high movement to high pressure/low movement.</p><p></p><p> To me the increase in pressure acting on the bush increases the friction so we had a system which had built in progressive damping, of course with rollers almost all of this disappears, which is why I've had to increase the spring rate.</p><p></p><p>I could of course be completely wrong !!!</p><p></p><p>Chris.</p></blockquote><p></p>
[QUOTE="Chris Launders, post: 79223, member: 2010"] Gentlemen can you put your thinking caps on about this please, just to satisfy a puzzle I've had, when I fitted needle rollers to the bottom links instead of bushes I expected to have to increase the damping to compensate for the reduced friction but I've had to increase the spring rate as well quite a bit to stop the forks bottoming out. Now an idea has lodged itself in my head that the friction of the link bushes increases as the angle increases, now this may seem strange but I think it works like this; To simplify things, say the fork action is vertical and the links are around horizontal, the action is purely rotational, but as the angle increases a proportion of the forces acting upwards pulls against the bottom of the eccentric increasing the pressure, the extreme of this is if in theory the link could achieve the vertical ALL the forces exerted upwards would be pressing against the bush/eccentric and there would be no rotation, so we have gone from a position of low pressure/ high movement to high pressure/low movement. To me the increase in pressure acting on the bush increases the friction so we had a system which had built in progressive damping, of course with rollers almost all of this disappears, which is why I've had to increase the spring rate. I could of course be completely wrong !!! Chris. [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Modified Steering Stem
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