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: 172661" data-attributes="member: 5456"><p>ktm 690 and Yamaha raptor (700cc), and JAWA 889 engines have the holes at 90degrees from TDC in the advance of TDC so the oil gets there before the combustion pressure exerts its force onto the rods.</p><p>I do agree with the philosophy at 90 degrees there is an oil bath and indeed all the holes get pretty much the same quantity of oil.</p><p>the Ducati bevels had the oil holes just past TDC to oil them on the actual power stroke. and the holes were in the middle of the bearing track(s).</p><p></p><p>note: I mentioned 30 degrees before as an example, not actual degrees! my bad if that put you off!</p><p></p><p>what I do miss, tbh, is a conversion to plain bearing bigends like the older Royal Enfield had them (and the latest KTM 690R and smaller 390 engines!); I suppose until there is a proper oil pump that generates sufficient pressure (more than flow!) that's out of the question, as then it doesn't really matter where the oil holes would be (aquaplaning effect so no contact between the running surfaces).</p><p></p><p>the crankshaft in above picture has mainshafts and webs from 1 piece? if so that's superior to the existing design and stiffer too! ducati bevels (singel and twins) and modern 4T single bangers with needle bearings have this too and a lot simpler to align/true during/after pressing together. </p><p>just my opinion...</p></blockquote><p></p>
[QUOTE="DucATIRadeon, post: 172661, member: 5456"] ktm 690 and Yamaha raptor (700cc), and JAWA 889 engines have the holes at 90degrees from TDC in the advance of TDC so the oil gets there before the combustion pressure exerts its force onto the rods. I do agree with the philosophy at 90 degrees there is an oil bath and indeed all the holes get pretty much the same quantity of oil. the Ducati bevels had the oil holes just past TDC to oil them on the actual power stroke. and the holes were in the middle of the bearing track(s). note: I mentioned 30 degrees before as an example, not actual degrees! my bad if that put you off! what I do miss, tbh, is a conversion to plain bearing bigends like the older Royal Enfield had them (and the latest KTM 690R and smaller 390 engines!); I suppose until there is a proper oil pump that generates sufficient pressure (more than flow!) that's out of the question, as then it doesn't really matter where the oil holes would be (aquaplaning effect so no contact between the running surfaces). the crankshaft in above picture has mainshafts and webs from 1 piece? if so that's superior to the existing design and stiffer too! ducati bevels (singel and twins) and modern 4T single bangers with needle bearings have this too and a lot simpler to align/true during/after pressing together. just my opinion... [/QUOTE]
Insert quotes…
Verification
What was Mr Irving'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