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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
New AVO coil-over for B and C series, plus damper update.
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<blockquote data-quote="timetraveller" data-source="post: 178438" data-attributes="member: 456"><p>I spoke to the manufacturers yesterday. At the moment I am getting them to concentrate on the front one first. They have finished the CAD work and ten prototypes will be machined by their engineers in a couple of weeks, or more, time. The lower body will be machined from solid aluminium and there will be a black anodised shroud over the upper part. Therefore, they will be similar in appearance to the original Vincent dampers. Adjustment will be via a knob as that is what they normally provide. I have asked them to let me have graphs showing the resistance of their dampers compared with the AVO dampers and have lent them a front AVO damper to be used for test purposes. Some of you will be aware that we found out that when the original AVOs were used in conjunction with a lower link with ball races at the rear, as opposed to Oilite bushes, by a heavy rider on a twin the dampers could not be adjusted to give enough damping for the extra mass. We had to get extra stiff dampers made by AVO. The new people use a different damping mechanism and are of the opinion that their system will give enough range to cover all users. If that is so then that will be a bonus. </p><p>At the moment I am working on the assumption that one of their standard coil over dampers will be suitable for the rear if two are used. One each side as the original Vincent spring boxes. They normally use a spherical shaped bearing, top and bottom of their coil overs, and so I have offered to provide a design for a special nut that will fit onto the original studs and fully support the spherical bearings. It might be necessary to provide a shroud of some sort to cover the upper part of the springs to prevent anything being caught in the springs while riding.</p><p>There are those, Vibrac being one of them, who would prefer to keep the weight down by using a single, centrally mounted coil over. We think that this might be possible but might need to design a new upper pivot/support eye.</p><p>As an aside they have also been approached by a tuning company based at Castle Coombe race course who have asked if they can make dampers for Vincents. If the person who had made this approach reads this then it would be helpful if we could work together to ensure that between us we come up with the best solution that we can. I am not pompous enough to guarantee to find the best solution to this design that is possible on my own.</p></blockquote><p></p>
[QUOTE="timetraveller, post: 178438, member: 456"] I spoke to the manufacturers yesterday. At the moment I am getting them to concentrate on the front one first. They have finished the CAD work and ten prototypes will be machined by their engineers in a couple of weeks, or more, time. The lower body will be machined from solid aluminium and there will be a black anodised shroud over the upper part. Therefore, they will be similar in appearance to the original Vincent dampers. Adjustment will be via a knob as that is what they normally provide. I have asked them to let me have graphs showing the resistance of their dampers compared with the AVO dampers and have lent them a front AVO damper to be used for test purposes. Some of you will be aware that we found out that when the original AVOs were used in conjunction with a lower link with ball races at the rear, as opposed to Oilite bushes, by a heavy rider on a twin the dampers could not be adjusted to give enough damping for the extra mass. We had to get extra stiff dampers made by AVO. The new people use a different damping mechanism and are of the opinion that their system will give enough range to cover all users. If that is so then that will be a bonus. At the moment I am working on the assumption that one of their standard coil over dampers will be suitable for the rear if two are used. One each side as the original Vincent spring boxes. They normally use a spherical shaped bearing, top and bottom of their coil overs, and so I have offered to provide a design for a special nut that will fit onto the original studs and fully support the spherical bearings. It might be necessary to provide a shroud of some sort to cover the upper part of the springs to prevent anything being caught in the springs while riding. There are those, Vibrac being one of them, who would prefer to keep the weight down by using a single, centrally mounted coil over. We think that this might be possible but might need to design a new upper pivot/support eye. As an aside they have also been approached by a tuning company based at Castle Coombe race course who have asked if they can make dampers for Vincents. If the person who had made this approach reads this then it would be helpful if we could work together to ensure that between us we come up with the best solution that we can. I am not pompous enough to guarantee to find the best solution to this design that is possible on my own. [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
New AVO coil-over for B and C series, plus damper update.
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