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
Front Spring Boxes - pressure relief hole
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: 22659" data-attributes="member: 456"><p>This should stir up some trouble!! I have real trouble believing that air relief holes are going to make much difference unless they are very large. Imagine if the front fork inner was a piston like fit and wanted to move upwards about 2" in a very small fraction of a second and then move down again, up again and so on going over a series of bumps, pot holes or whatever. Either the air has to compress/decompress and act to some extent as a spring or it has to escape. Take a normal pump for use on pedal cycle tyres and then push it rapidly inwards leaving the outlet totally open. Pull it out and then pump it backwards and forwards a few times. You probably cannot get it to move as quickly as it has to do on a motorcycle going over bumps but the dimensions are similar and that gives you some idea of what is involved when the outlet hole is several millimetres in diameter. I know that the Vincent spring boxes are not as good a fit as a pedal cycle pump and its piston but if PTFE bushes are fitted then they are getting to be near to it. Of course the proof is in the pudding, as they say, but I have real reservations that making any holes much less than, say, quarter of an inch in diameter will make any difference. That size hole or larger is likely to suck in rain and road dirt.</p></blockquote><p></p>
[QUOTE="timetraveller, post: 22659, member: 456"] This should stir up some trouble!! I have real trouble believing that air relief holes are going to make much difference unless they are very large. Imagine if the front fork inner was a piston like fit and wanted to move upwards about 2" in a very small fraction of a second and then move down again, up again and so on going over a series of bumps, pot holes or whatever. Either the air has to compress/decompress and act to some extent as a spring or it has to escape. Take a normal pump for use on pedal cycle tyres and then push it rapidly inwards leaving the outlet totally open. Pull it out and then pump it backwards and forwards a few times. You probably cannot get it to move as quickly as it has to do on a motorcycle going over bumps but the dimensions are similar and that gives you some idea of what is involved when the outlet hole is several millimetres in diameter. I know that the Vincent spring boxes are not as good a fit as a pedal cycle pump and its piston but if PTFE bushes are fitted then they are getting to be near to it. Of course the proof is in the pudding, as they say, but I have real reservations that making any holes much less than, say, quarter of an inch in diameter will make any difference. That size hole or larger is likely to suck in rain and road dirt. [/QUOTE]
Insert quotes…
Verification
What was Mr Vincent's Christian Name?
Post reply
Home
Forums
Forums: Public Access
Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Front Spring Boxes - pressure relief hole
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