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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Modified Steering Stem
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<blockquote data-quote="timetraveller" data-source="post: 80892" data-attributes="member: 456"><p>Greg (573 above) is right. Six months ago I thought that we had all the parameter well defined and then Chris decided to fit some needle roller bearings (Greg uses ball races) to the rear of the lower link. None of us involved expected, or even understand, why this should have made such a difference but it does. We first of all had to go to stronger springs, which because of the geometry/prelod have to be shorter to give the correct angle to the lower link. Then we found that what had been apparently perfect damping when the Oilite bushes were used had to be increased. If Vibrac intends to use Oilite bushes then I think that I can say with confidence that we know what is required. (30 or 33 lbs/inch springs and an AVO damper on its lightest setting. The range in the spring strengths is a function of total weight so depends upon the bike + rider weight and is not critical.) If ball races are to be used then I think that we are there but feedback from more than just Chris is needed to take into account a variety of road and rider variations. I should be able to start to send out kits with dampers once the first batch of four standard AVO dampers arrive in the next few days for those continuing to use the Oilite bushes. We think that we are also there with defining what is required when ball races are used but it will still require some feedback to ensure that I can send out the optimised combination of part to all users.</p></blockquote><p></p>
[QUOTE="timetraveller, post: 80892, member: 456"] Greg (573 above) is right. Six months ago I thought that we had all the parameter well defined and then Chris decided to fit some needle roller bearings (Greg uses ball races) to the rear of the lower link. None of us involved expected, or even understand, why this should have made such a difference but it does. We first of all had to go to stronger springs, which because of the geometry/prelod have to be shorter to give the correct angle to the lower link. Then we found that what had been apparently perfect damping when the Oilite bushes were used had to be increased. If Vibrac intends to use Oilite bushes then I think that I can say with confidence that we know what is required. (30 or 33 lbs/inch springs and an AVO damper on its lightest setting. The range in the spring strengths is a function of total weight so depends upon the bike + rider weight and is not critical.) If ball races are to be used then I think that we are there but feedback from more than just Chris is needed to take into account a variety of road and rider variations. I should be able to start to send out kits with dampers once the first batch of four standard AVO dampers arrive in the next few days for those continuing to use the Oilite bushes. We think that we are also there with defining what is required when ball races are used but it will still require some feedback to ensure that I can send out the optimised combination of part to all users. [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Modified Steering Stem
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