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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Modified Steering Stem
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<blockquote data-quote="hadronuk" data-source="post: 75685" data-attributes="member: 1866"><p>I am surprised that the AVO front damper seemed so stiff. It may be that it needs to bed-in a little as you say. </p><p>Hand testing dampers can be very deceptive!</p><p>We dyno tested several dampers. All except the original Vincent damper had a fairly "flat" bump characteristic in that the damping force quickly reached a "plateau", then did not greatly increase.</p><p>This "plateau" is at about 25 lbs for an AVO front. </p><p>The original Vincent damper, being a simple fixed orifice design,<em> was initially very soft, but reached over 60lbs at higher velocities. </em>(Fixed orifice designs are not used now, because they allow low frequency wallowing but are harsh at higher speeds.)</p><p>My Armstrong had a plateau at about 11 lbs. </p><p>On the road <em>with well bedded in Girdraulics</em>, I found the Armstrong to be comfortable, but just too soft at any speed over less than smooth roads. The final setting for the AVO was chosen to be just stiff enough to give control, but comfort still felt as good as the Armstrong.</p><p></p><p>There is a very big caveat to be borne in mind on this subject. There is a lot of friction in Girdraulics! My test measurements showed that even a well bedded-in pair of spring cases provide about 8 lbs of damping when the forks are extended and about 24 lbs when the forks are compressed. That's just the friction in the spring cases, I have not measured the friction from the link bearings.</p><p>SO THE TOTAL FRICTION DAMPING IN GIRDRAULICS MAY BE GREATER THAN THE HYDRAULIC! </p><p>This makes it harder to assess small differences in damper settings, especially if they are not tested on the same bike.</p><p>The Thornton damper we tested was for the rear. This had a plateau at about 40lbs mid range and reached 50lbs at max velocity. This is similar to the settings of the AVO rear.</p><p>I would be very surprised if a Thornton front damper tested as soft as the Armstrong on a dyno. As I said, hand testing dampers can be very misleading.</p></blockquote><p></p>
[QUOTE="hadronuk, post: 75685, member: 1866"] I am surprised that the AVO front damper seemed so stiff. It may be that it needs to bed-in a little as you say. Hand testing dampers can be very deceptive! We dyno tested several dampers. All except the original Vincent damper had a fairly "flat" bump characteristic in that the damping force quickly reached a "plateau", then did not greatly increase. This "plateau" is at about 25 lbs for an AVO front. The original Vincent damper, being a simple fixed orifice design,[I] was initially very soft, but reached over 60lbs at higher velocities. [/I](Fixed orifice designs are not used now, because they allow low frequency wallowing but are harsh at higher speeds.) My Armstrong had a plateau at about 11 lbs. On the road [I]with well bedded in Girdraulics[/I], I found the Armstrong to be comfortable, but just too soft at any speed over less than smooth roads. The final setting for the AVO was chosen to be just stiff enough to give control, but comfort still felt as good as the Armstrong. There is a very big caveat to be borne in mind on this subject. There is a lot of friction in Girdraulics! My test measurements showed that even a well bedded-in pair of spring cases provide about 8 lbs of damping when the forks are extended and about 24 lbs when the forks are compressed. That's just the friction in the spring cases, I have not measured the friction from the link bearings. SO THE TOTAL FRICTION DAMPING IN GIRDRAULICS MAY BE GREATER THAN THE HYDRAULIC! This makes it harder to assess small differences in damper settings, especially if they are not tested on the same bike. The Thornton damper we tested was for the rear. This had a plateau at about 40lbs mid range and reached 50lbs at max velocity. This is similar to the settings of the AVO rear. I would be very surprised if a Thornton front damper tested as soft as the Armstrong on a dyno. As I said, hand testing dampers can be very misleading. [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Modified Steering Stem
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