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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Trevor Southwell re brakes
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<blockquote data-quote="fogrider" data-source="post: 177693" data-attributes="member: 2655"><p>The need to grind, or turn, the linings to drum size is important as any kind of distortion in shoes, pivots, cam boss etc plus drum wear is accounted for. What I now see is that the "dips" on the shoes are placing the linings away from the design ideal of 90 deg ,being biased much nearer the pivot than the cam. As the self servo effect at the leading shoe lining is more nearer the cam, I rather think that is where the Vin brakes are losing some effect. I shall have some re-lining done to test this, more to correct what I see as a built in error, rather than another mod. Does'nt require any major engineering either - same re-lining cost too.</p><p>Sadly I won't be able to report on the result until late spring. I doubt it will be a monster change to the good, but every bit helps.</p><p> Has anyone already tried moving both linings towards the cam ? And how far ?</p></blockquote><p></p>
[QUOTE="fogrider, post: 177693, member: 2655"] The need to grind, or turn, the linings to drum size is important as any kind of distortion in shoes, pivots, cam boss etc plus drum wear is accounted for. What I now see is that the "dips" on the shoes are placing the linings away from the design ideal of 90 deg ,being biased much nearer the pivot than the cam. As the self servo effect at the leading shoe lining is more nearer the cam, I rather think that is where the Vin brakes are losing some effect. I shall have some re-lining done to test this, more to correct what I see as a built in error, rather than another mod. Does'nt require any major engineering either - same re-lining cost too. Sadly I won't be able to report on the result until late spring. I doubt it will be a monster change to the good, but every bit helps. Has anyone already tried moving both linings towards the cam ? And how far ? [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Trevor Southwell re brakes
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