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
Partial Single Seizure? Safe to ride?
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="greg brillus" data-source="post: 99503" data-attributes="member: 597"><p>As discussed before on this forum, later engines like the Yamaha use a much higher flow of lubricating and cooling oil to the cylinder head. The large diameter (relatively) cylinder hold down studs as well as supporting the entire forward mass of the engine, also act as heat sinks and certainly can be a common place on the inner walls of the liner to cause four points at which the piston will readily "Grab" and seize quite easily. The Vincent cylinder head is not really a large casting by mass and has many large holes cast or machined into it, thus the heat verses material is probably quite a poor ratio, much of this heat is absorbed by the cylinder muff, but also by the piston. There are many that have suffered piston issues, not least because of ignition or bad carburation, but lack of piston clearance is common, the specs by the manufacturers is not in the "Real world" of what actually happens in the engine. I have seen brand new barrel/piston kits for a Harley Sportster engine that had one thou piston clearance...........Would not have made it to the end of the street.</p></blockquote><p></p>
[QUOTE="greg brillus, post: 99503, member: 597"] As discussed before on this forum, later engines like the Yamaha use a much higher flow of lubricating and cooling oil to the cylinder head. The large diameter (relatively) cylinder hold down studs as well as supporting the entire forward mass of the engine, also act as heat sinks and certainly can be a common place on the inner walls of the liner to cause four points at which the piston will readily "Grab" and seize quite easily. The Vincent cylinder head is not really a large casting by mass and has many large holes cast or machined into it, thus the heat verses material is probably quite a poor ratio, much of this heat is absorbed by the cylinder muff, but also by the piston. There are many that have suffered piston issues, not least because of ignition or bad carburation, but lack of piston clearance is common, the specs by the manufacturers is not in the "Real world" of what actually happens in the engine. I have seen brand new barrel/piston kits for a Harley Sportster engine that had one thou piston clearance...........Would not have made it to the end of the street. [/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
Partial Single Seizure? Safe to ride?
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