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
Exhaust Tappet
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="oexing" data-source="post: 119350" data-attributes="member: 1493"><p>Looking at the failed adjuster I get my doubts about oil supply from the rocker bearings - and along these lines about oiling the cams via pushrods and oil hole in follower. I can imagine all oil is flung off the rocker before it gets to the rocker end to lubricate the adjuster cup and in fact most of it runs down along the pushrod shrouds possibly. So I do not bet on cam oiling from pushrods and instead care for oil through cam spindles and their needle bearings. With same logic I lasered the follower oil hole shut .</p><p> One thing all Vincenteers should watch is unusual adjuster settings way off the initial looks with time : This is a great tell-tale of something going on in the valve train, either low down in the box of troubles or in the top end. So really this defect could have been found before dramatic failure. </p><p> I think the cups in the adjusters and in the followers as well are way too deep machined: All you need is a depth like the radius of the ball ends, anything more is of no use , in fact bad as it limits the deflection between pushrod and rocker or follower, critical for high lift cams. So I ground off one mm from the Neal Videan adjusters and the followers too, no use anything deeper. On some pushrods the waisting below the ball end seems a bit minimal so another detail to rectify. Bent pushrods and defects like above are the consequence of hitting the edge of the deep cup on deflection.</p><p> In my photo to compare sizes the top pushrod is Horex 400 alu, below BMW /5 or /6 series stainless steel, later changed to alu 10 mm 2mm wall thickness, like on my own on bottom place. See the BMW adjuster with cup depth same like radius of ball end,no need for more depth, even with that length of rod which is safe to standard 7000 rpm, in fact more than 8000 rpm. The shortened Videan adjuster on my alu rod got all that deflection you see in the photo while still sitting in the cup. </p><p> The 10 mm alu pushrods in the B-Rapides required some mods : The countersinks in the engine case for the rod shrouds and their seals don´t line up with the cups in the followers from design and were never rectified I guess ? So for extra clearance I made offset alu seal adapters and shortened the shrouds for offsetting the pushrods. Works to my likings but needs a little attention when assembling the head and pushrods. All alu engines , cylinders and heads should go with alu pushrods for keeping valve clearances, steel is not desirable here.</p><p>[ATTACH=full]34165[/ATTACH]</p><p></p><p>[ATTACH=full]34168[/ATTACH]</p><p></p><p>[ATTACH=full]34170[/ATTACH]</p></blockquote><p></p>
[QUOTE="oexing, post: 119350, member: 1493"] Looking at the failed adjuster I get my doubts about oil supply from the rocker bearings - and along these lines about oiling the cams via pushrods and oil hole in follower. I can imagine all oil is flung off the rocker before it gets to the rocker end to lubricate the adjuster cup and in fact most of it runs down along the pushrod shrouds possibly. So I do not bet on cam oiling from pushrods and instead care for oil through cam spindles and their needle bearings. With same logic I lasered the follower oil hole shut . One thing all Vincenteers should watch is unusual adjuster settings way off the initial looks with time : This is a great tell-tale of something going on in the valve train, either low down in the box of troubles or in the top end. So really this defect could have been found before dramatic failure. I think the cups in the adjusters and in the followers as well are way too deep machined: All you need is a depth like the radius of the ball ends, anything more is of no use , in fact bad as it limits the deflection between pushrod and rocker or follower, critical for high lift cams. So I ground off one mm from the Neal Videan adjusters and the followers too, no use anything deeper. On some pushrods the waisting below the ball end seems a bit minimal so another detail to rectify. Bent pushrods and defects like above are the consequence of hitting the edge of the deep cup on deflection. In my photo to compare sizes the top pushrod is Horex 400 alu, below BMW /5 or /6 series stainless steel, later changed to alu 10 mm 2mm wall thickness, like on my own on bottom place. See the BMW adjuster with cup depth same like radius of ball end,no need for more depth, even with that length of rod which is safe to standard 7000 rpm, in fact more than 8000 rpm. The shortened Videan adjuster on my alu rod got all that deflection you see in the photo while still sitting in the cup. The 10 mm alu pushrods in the B-Rapides required some mods : The countersinks in the engine case for the rod shrouds and their seals don´t line up with the cups in the followers from design and were never rectified I guess ? So for extra clearance I made offset alu seal adapters and shortened the shrouds for offsetting the pushrods. Works to my likings but needs a little attention when assembling the head and pushrods. All alu engines , cylinders and heads should go with alu pushrods for keeping valve clearances, steel is not desirable here. [ATTACH type="full"]34165[/ATTACH] [ATTACH type="full"]34168[/ATTACH] [ATTACH type="full"]34170[/ATTACH] [/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
Exhaust Tappet
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