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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Prototype of new AVO coilover for Series ‘D’ Vincents
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<blockquote data-quote="hadronuk" data-source="post: 98841" data-attributes="member: 1866"><p><strong>Gary,</strong></p><p></p><p>Initial feedback on the D AVO coilover road testing is that it is very comfortable and I see no reason why it cannot closely rival the Thornton in this respect. The Thornton/WP units are undoubtedly high quality, but the AVO may even perform a little better if the Thornton is not a good match for a particular riders needs.</p><p></p><p>Some comparisons of the AVO and WP D series coilovers:</p><p></p><p><strong>Springing.</strong></p><p>Looking at the photo of a WP unit, it appears that one spring can be adjusted, thereby changing the point at which the spring rate increases. Very clever.</p><p>However, the AVO unit will be available with a wide choice of spring rates and a widely adjustable preload so that it can be tailored by the customer to their personal requirements.</p><p></p><p><strong>Damping.</strong></p><p>Although we have not tested a WP D series coilover, we did dyno test a Thornton rear shock for B/C bikes. The characteristics were generally much like the AVO and Koni rear units, but with one difference. At high rebound velocities the Thornton became very stiff. It may be that in practice these test rebound velocities are never reached so are irrelevant, or the unit we tested was not representative. But I can’t see that excessive rebound stiffness is a good thing, as it can result in "ratcheting down" over rough roads.</p><p>It would be very interesting if David could provide more information about what Joe Stimola thought differentiated it from all others? Speculating, if he did more extensive testing representative of racing use, problems such as fade due to frothing could show up with some dampers.</p><p>One last point on damping.</p><p>All Vincent AVO units have damping that can be quickly adjusted on the bike to suit personal taste, a facility that no one else now offers.</p><p></p><p><strong>Ride height.</strong></p><p>I’m very optimistic that we will be able to offer a lower seat height unit with very little or no loss of comfort or load capacity. The arithmetic looks very promising, but more road testing will be needed to confirm.</p><p></p><p>Rob.</p></blockquote><p></p>
[QUOTE="hadronuk, post: 98841, member: 1866"] [B]Gary,[/B] Initial feedback on the D AVO coilover road testing is that it is very comfortable and I see no reason why it cannot closely rival the Thornton in this respect. The Thornton/WP units are undoubtedly high quality, but the AVO may even perform a little better if the Thornton is not a good match for a particular riders needs. Some comparisons of the AVO and WP D series coilovers: [B]Springing.[/B] Looking at the photo of a WP unit, it appears that one spring can be adjusted, thereby changing the point at which the spring rate increases. Very clever. However, the AVO unit will be available with a wide choice of spring rates and a widely adjustable preload so that it can be tailored by the customer to their personal requirements. [B]Damping.[/B] Although we have not tested a WP D series coilover, we did dyno test a Thornton rear shock for B/C bikes. The characteristics were generally much like the AVO and Koni rear units, but with one difference. At high rebound velocities the Thornton became very stiff. It may be that in practice these test rebound velocities are never reached so are irrelevant, or the unit we tested was not representative. But I can’t see that excessive rebound stiffness is a good thing, as it can result in "ratcheting down" over rough roads. It would be very interesting if David could provide more information about what Joe Stimola thought differentiated it from all others? Speculating, if he did more extensive testing representative of racing use, problems such as fade due to frothing could show up with some dampers. One last point on damping. All Vincent AVO units have damping that can be quickly adjusted on the bike to suit personal taste, a facility that no one else now offers. [B]Ride height.[/B] I’m very optimistic that we will be able to offer a lower seat height unit with very little or no loss of comfort or load capacity. The arithmetic looks very promising, but more road testing will be needed to confirm. Rob. [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Prototype of new AVO coilover for Series ‘D’ Vincents
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