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
What's my Black Shadow balance factor?
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="Vincent Brake" data-source="post: 94535" data-attributes="member: 398"><p>i did the top 3 holes:</p><p></p><p></p><p> </p><p>Static Rebalanced:</p><p></p><p>Small end weight When levelled:</p><p></p><p>Pri side 203 gr, timing 200gr = 403 gr</p><p></p><p>Pistons complete each 457 gr</p><p></p><p>Formula: free to The Man:</p><p></p><p>Weight to balance (where we take the % from) = small end + pistons complete</p><p></p><p>1317gr = 403 +2(*457)</p><p></p><p>Test: % of wieght - smallend=FG (FG: being weight to the smallend when in balance)</p><p></p><p>638 - 403= 235gr</p><p></p><p>So 638 is 48,4 % of 1317 (being 100% reciprocating weight)</p><p></p><p>To balance to about 55%</p><p></p><p>By drilling the 4 top holes to 13mm and the middle top holes milled 12,5 and milled bit to the top</p><p></p><p>After some extra drilling FG became 303gr leaving the balance weight to 706</p><p></p><p>this being <strong>53.6% balance factor</strong> from 1317gr</p><p></p><p>that worked for me,</p><p>although still not Dynamically balanced, (one need to make a bob wieght exactly running in true, let allone the weight....) have to say i did frist both flywheels on a knife edge, bit cumbersome but one gets them more or less the same, when done in two axis.</p><p></p><p>well of course this is all shit so may god and good luck be with you, when finally you start her and she jumps like a horse<img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite8" alt=":D" title="Big Grin :D" loading="lazy" data-shortname=":D" /></p></blockquote><p></p>
[QUOTE="Vincent Brake, post: 94535, member: 398"] i did the top 3 holes: Static Rebalanced: Small end weight When levelled: Pri side 203 gr, timing 200gr = 403 gr Pistons complete each 457 gr Formula: free to The Man: Weight to balance (where we take the % from) = small end + pistons complete 1317gr = 403 +2(*457) Test: % of wieght - smallend=FG (FG: being weight to the smallend when in balance) 638 - 403= 235gr So 638 is 48,4 % of 1317 (being 100% reciprocating weight) To balance to about 55% By drilling the 4 top holes to 13mm and the middle top holes milled 12,5 and milled bit to the top After some extra drilling FG became 303gr leaving the balance weight to 706 this being [B]53.6% balance factor[/B] from 1317gr that worked for me, although still not Dynamically balanced, (one need to make a bob wieght exactly running in true, let allone the weight....) have to say i did frist both flywheels on a knife edge, bit cumbersome but one gets them more or less the same, when done in two axis. well of course this is all shit so may god and good luck be with you, when finally you start her and she jumps like a horse:D [/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
What's my Black Shadow balance factor?
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