The Spares Company
Club Shop/Regalia
Parent Website
Contact Officials
Machine Registrar
Club Secretary
Membership Secretaries
MPH Editor and Forum Administrator.
Section Newsletters
Technical Databases
Photos
Home
What's new
Latest activity
Forums
New posts
What's new
New posts
Latest activity
Information
Bike Modifications
Machine Data Services
Manufacturers Manuals
Spare Parts Listings
Technical Diagrams
Whitakerpedia (Vincent Wiki)
The Club
MPH Material Archive
Flogger's Corner
Obituaries
VOC Sections
Local Sections
Local Section Newsletters
Miscellaneous
Club Assets
Club History
Club Rules
Machine Data Services
Meeting Documents
Miscellaneous
Essential Reading
Magazine/Newspaper Articles/Letters
Adverts and Sales Brochures
The Mighty Garage Videos
Bikes For Sale (Spares Company)
Log in
Register
What's new
New posts
Menu
Log in
Register
Install the app
Install
Home
Forums
Forums: Public Access
Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Spring Strengths to be used with Fully Sprung Rear Seats and AVO Coil Over Dampers
JavaScript is disabled. For a better experience, please enable JavaScript in your browser before proceeding.
You are using an out of date browser. It may not display this or other websites correctly.
You should upgrade or use an
alternative browser
.
Reply to thread
Message
<blockquote data-quote="timetraveller" data-source="post: 157158" data-attributes="member: 456"><p>OK Nigel, thanks for the input. Going through your figures and comparing them with the above table I see that for a 220 lbs rider we found that a compression of the 275 lbs/inch spring would 1.9". Converting your measurement of 160 mm back to inches for the benefit of the table gives 6.3" which when removed from the 8" length of the spring means that there is 1.7" of compression. If our figure of 1.9" is right you could give it a bit more. We did find that about 90% of the weight of the pillion passenger is passed onto the rear spring. 90% of Allyson's weight is about 150 lbs and if we add that onto your 220 lbs it just takes us off the bottom of the table but near enough to show that you woiuld need about 2.4" of preload but a 3G bump would certainly bottom out. Chris has found that with his weight, about 300 lbs, he is not getting much movement on normal road surfaces with the 350 lbs/inch spring. He is a very ingenious person. Currently he has created an indicator using a speedo cable that will show the movement of the top of the RFM along the crash bar. That way he can actually see how much damper travel is occurring. In the mean time I am going to try to produce a graph that will show what would happen if one used a double spring, say a 275 plus a 400, i.e. two equal length springs. I suspect that the 275 would be coil bound much of the time.</p></blockquote><p></p>
[QUOTE="timetraveller, post: 157158, member: 456"] OK Nigel, thanks for the input. Going through your figures and comparing them with the above table I see that for a 220 lbs rider we found that a compression of the 275 lbs/inch spring would 1.9". Converting your measurement of 160 mm back to inches for the benefit of the table gives 6.3" which when removed from the 8" length of the spring means that there is 1.7" of compression. If our figure of 1.9" is right you could give it a bit more. We did find that about 90% of the weight of the pillion passenger is passed onto the rear spring. 90% of Allyson's weight is about 150 lbs and if we add that onto your 220 lbs it just takes us off the bottom of the table but near enough to show that you woiuld need about 2.4" of preload but a 3G bump would certainly bottom out. Chris has found that with his weight, about 300 lbs, he is not getting much movement on normal road surfaces with the 350 lbs/inch spring. He is a very ingenious person. Currently he has created an indicator using a speedo cable that will show the movement of the top of the RFM along the crash bar. That way he can actually see how much damper travel is occurring. In the mean time I am going to try to produce a graph that will show what would happen if one used a double spring, say a 275 plus a 400, i.e. two equal length springs. I suspect that the 275 would be coil bound much of the time. [/QUOTE]
Insert quotes…
Verification
The Series 'A' Rapide was known as the '********' Nightmare?
Post reply
Home
Forums
Forums: Public Access
Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Spring Strengths to be used with Fully Sprung Rear Seats and AVO Coil Over Dampers
This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register.
By continuing to use this site, you are consenting to our use of cookies.
Accept
Learn more…
Top