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
Valve Timing
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="Mikeant" data-source="post: 127002" data-attributes="member: 3800"><p>I have just installed new 105 cams. Found the equal lift points and marked cam pinions and the crankcase adjacent. Crank set at 4deg BTDC. Inserted idler and crank pinion. Rotated crank pinion until a keyway lined up and inserted the key. Rotated engine forward by 360+50 degrees and inserted front camwheel into mesh. Next, checking, I get rear cylinder equal lift point at 7.1deg BTC and the front at 2.9deg BTDC. It seems to be the case that one or other of the cams is not inserted correctly into its wheel. There is 4.2deg error.</p><p></p><p>So questions. </p><p>1) is this timing acceptable?</p><p>2) If not, how can it be improved? (combinations of a different keyway on the crank pinion - 1.5 deg - and/or moving a camwheel by a tooth - 7.5 deg )</p><p>3) should I be moving a cam relative to its wheel?</p><p></p><p>This is a 1948 Rapide engine with 8:1 CR pistons</p></blockquote><p></p>
[QUOTE="Mikeant, post: 127002, member: 3800"] I have just installed new 105 cams. Found the equal lift points and marked cam pinions and the crankcase adjacent. Crank set at 4deg BTDC. Inserted idler and crank pinion. Rotated crank pinion until a keyway lined up and inserted the key. Rotated engine forward by 360+50 degrees and inserted front camwheel into mesh. Next, checking, I get rear cylinder equal lift point at 7.1deg BTC and the front at 2.9deg BTDC. It seems to be the case that one or other of the cams is not inserted correctly into its wheel. There is 4.2deg error. So questions. 1) is this timing acceptable? 2) If not, how can it be improved? (combinations of a different keyway on the crank pinion - 1.5 deg - and/or moving a camwheel by a tooth - 7.5 deg ) 3) should I be moving a cam relative to its wheel? This is a 1948 Rapide engine with 8:1 CR pistons [/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
Valve Timing
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