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Tech. Advice: Series 'D' 500cc/1000cc Bikes
AVO COIL OVER WANTED HELP PLEASE
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<blockquote data-quote="timetraveller" data-source="post: 176597" data-attributes="member: 456"><p>Hi Chris, that is correct. You started off with 36 lbs/inch springs and the standard AVO front damper. When you changed to needle rollers as replacements for the Oilite bushes (instead of Greg's mod of two ball races each side) you thought that the damper had failed. It went back to AVOs for testing and was found to be in good order. That is when I got AVO to make some specially stiff dampers. Those stopped the pogoing effect but you still had to go up to 45 lbs/inch springs with about 5/8" of packing to stiffening the springing. I did mention a few day ago that once the new lower links are made it might be possible to modify the machining program to leave more metal around where the FF6 bronze bushes go so that needle rollers could be inserted there. The problem I envisage, but I am doing other stuff at the moment, is that it might be difficult to find imperial needle roller bearing to fit the spindles. Changing the spindle size is probably a step too far for most people.</p><p>Regarding Brian's posting above. #85, when John Emmanuel designed the new geometry it was for handling while racing. John just used different strength springs until he found what he regarded as satisfactory but he did not know what strength they were. When I started making them available I had to calculate what I thought would be suitable and then realised that the comfort could be improved by using as much travel as possible within the constraints of the existing design. I managed to get about 3" of travel and most people who use the bikes for touring seem to find that is a nice figure. Both Chris Launders and the Tilleys have made videos of the front fork movement and those videos can be found on here. They perform as I intended. </p><p>There might be some wriggle room when it comes to the travel of the front damper. Note that the original Vincent damper is about 3/8" longer than both the AVO and the earlier Armstrong. One has to use the longer lower eyebolts with the shorter dampers but it is possible that going back to the use of the original eyebolts and making use of the potential extra 3/8" damper length might allow the damping system to be installed and have the extra movement. We are not talking one or two millimetres here. Whether the total travel is 75 mm or 70 is probably not important to most people.</p><p>While discussing damping rates; I wonder whether the pneumatic dampers discussed by VIC have different damping rates between compression and extension. It is really important that the extension is more heavily damped than the compression for maximum comfort and safety. I noticed while looking through the Protech site this morning that some of their dampers have two adjuster knobs on them. If that is one for compression and one for extension then that might be exciting.</p></blockquote><p></p>
[QUOTE="timetraveller, post: 176597, member: 456"] Hi Chris, that is correct. You started off with 36 lbs/inch springs and the standard AVO front damper. When you changed to needle rollers as replacements for the Oilite bushes (instead of Greg's mod of two ball races each side) you thought that the damper had failed. It went back to AVOs for testing and was found to be in good order. That is when I got AVO to make some specially stiff dampers. Those stopped the pogoing effect but you still had to go up to 45 lbs/inch springs with about 5/8" of packing to stiffening the springing. I did mention a few day ago that once the new lower links are made it might be possible to modify the machining program to leave more metal around where the FF6 bronze bushes go so that needle rollers could be inserted there. The problem I envisage, but I am doing other stuff at the moment, is that it might be difficult to find imperial needle roller bearing to fit the spindles. Changing the spindle size is probably a step too far for most people. Regarding Brian's posting above. #85, when John Emmanuel designed the new geometry it was for handling while racing. John just used different strength springs until he found what he regarded as satisfactory but he did not know what strength they were. When I started making them available I had to calculate what I thought would be suitable and then realised that the comfort could be improved by using as much travel as possible within the constraints of the existing design. I managed to get about 3" of travel and most people who use the bikes for touring seem to find that is a nice figure. Both Chris Launders and the Tilleys have made videos of the front fork movement and those videos can be found on here. They perform as I intended. There might be some wriggle room when it comes to the travel of the front damper. Note that the original Vincent damper is about 3/8" longer than both the AVO and the earlier Armstrong. One has to use the longer lower eyebolts with the shorter dampers but it is possible that going back to the use of the original eyebolts and making use of the potential extra 3/8" damper length might allow the damping system to be installed and have the extra movement. We are not talking one or two millimetres here. Whether the total travel is 75 mm or 70 is probably not important to most people. While discussing damping rates; I wonder whether the pneumatic dampers discussed by VIC have different damping rates between compression and extension. It is really important that the extension is more heavily damped than the compression for maximum comfort and safety. I noticed while looking through the Protech site this morning that some of their dampers have two adjuster knobs on them. If that is one for compression and one for extension then that might be exciting. [/QUOTE]
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Tech. Advice: Series 'D' 500cc/1000cc Bikes
AVO COIL OVER WANTED HELP PLEASE
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