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
Cam timing -- again
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="Robert Watson" data-source="post: 84342" data-attributes="member: 38"><p>The last three engine I set up I set the cam timing as close as I could with crossover of the valves at 4 deg BTDC. They have all run well at that. The A Rapide with 5X cams, TTR with 5X cam and C rapide with Robinson stellated MK11 cams, but I never thought to check any of them with the opening and closing as outlined in “The Books”.</p><p></p><p></p><p>So I am messing with my Comet that requires some timing chest attention and have just replaced the cam with a Mk2 (Stock one out and a Robinson stellite one in) and set it up at 4 degrees, and for entertainment checked the opening and closings at 10 thou lift.</p><p></p><p>I get</p><p></p><p></p><p>In open at 44 BTDC (Richardson says Mk1 at 40-42 and lightning at 55)</p><p></p><p>In close at 83 ATDC (Richardson says Mk1 at 60-64 and lightning at 68)</p><p></p><p></p><p>Ex open at 46 BBDC (Richardson says Mk1 at 72-70 and lightning at 73)</p><p></p><p>Ex close at 62 ATDC (Richardson says Mk1 at 28-33 and lightning at 50)</p><p></p><p></p><p>I see if I move the cam back about 10 deg I would get 54, 73, 56, and 52, somewhat closer to Mk2 specs. But crossover would be 14 deg BTDC.</p><p></p><p></p><p>Anyone got any thoughts??</p></blockquote><p></p>
[QUOTE="Robert Watson, post: 84342, member: 38"] The last three engine I set up I set the cam timing as close as I could with crossover of the valves at 4 deg BTDC. They have all run well at that. The A Rapide with 5X cams, TTR with 5X cam and C rapide with Robinson stellated MK11 cams, but I never thought to check any of them with the opening and closing as outlined in “The Books”. So I am messing with my Comet that requires some timing chest attention and have just replaced the cam with a Mk2 (Stock one out and a Robinson stellite one in) and set it up at 4 degrees, and for entertainment checked the opening and closings at 10 thou lift. I get In open at 44 BTDC (Richardson says Mk1 at 40-42 and lightning at 55) In close at 83 ATDC (Richardson says Mk1 at 60-64 and lightning at 68) Ex open at 46 BBDC (Richardson says Mk1 at 72-70 and lightning at 73) Ex close at 62 ATDC (Richardson says Mk1 at 28-33 and lightning at 50) I see if I move the cam back about 10 deg I would get 54, 73, 56, and 52, somewhat closer to Mk2 specs. But crossover would be 14 deg BTDC. Anyone got any thoughts?? [/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
Cam timing -- again
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