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
oil holes in Crank pin?
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="DucATIRadeon" data-source="post: 172601" data-attributes="member: 5456"><p>just my thoughts:</p><p>- holes@TDC the centrifugal force is maximum so all oil is slung out there with largest (radial) velocity.</p><p>depending on where you have the holes (inside or outside the running surface of the bearings) the oil can be slung past the bearings and Conrad to the pistons en cylinder walls (or even go nowhere if the spacer is between the conrods), or slung direct into the bearing rollers (where you actually want the oil to be cooling the bearings).</p><p></p><p>- holes 30 degrees before and after TDC still gives you the centrifugal force for the oil to get out, and distributes the oil more evenly for cooling during compression and working strokes.</p><p>if the holes are within the running surface of the bearing track, and if done properly, the needles wil not suffer nor will the holes in the main pin get chipped.</p><p></p><p>have look at how modern, high powered single piston performance engines with needle bearing bigends have the oil ways located (for example JAWA 500 889/ICE engine, 500cc capable of running at 13000rpm producing anywhere from 65 to 95hp depending on camshaft used, on standard 35x42x19 needle bearing running direct in the conrod).</p></blockquote><p></p>
[QUOTE="DucATIRadeon, post: 172601, member: 5456"] just my thoughts: - holes@TDC the centrifugal force is maximum so all oil is slung out there with largest (radial) velocity. depending on where you have the holes (inside or outside the running surface of the bearings) the oil can be slung past the bearings and Conrad to the pistons en cylinder walls (or even go nowhere if the spacer is between the conrods), or slung direct into the bearing rollers (where you actually want the oil to be cooling the bearings). - holes 30 degrees before and after TDC still gives you the centrifugal force for the oil to get out, and distributes the oil more evenly for cooling during compression and working strokes. if the holes are within the running surface of the bearing track, and if done properly, the needles wil not suffer nor will the holes in the main pin get chipped. have look at how modern, high powered single piston performance engines with needle bearing bigends have the oil ways located (for example JAWA 500 889/ICE engine, 500cc capable of running at 13000rpm producing anywhere from 65 to 95hp depending on camshaft used, on standard 35x42x19 needle bearing running direct in the conrod). [/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
oil holes in Crank pin?
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