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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Twin Primary Chain PD1
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<blockquote data-quote="oexing" data-source="post: 102556" data-attributes="member: 1493"><p>Yes, but the original design was wrong from the start - as with other ESAs from pre-war that got copied without thinking . That shallow cam profile may have been allright for 15 hp sidevalvers and maybe one fat spring, so the whole lot survived long enough. But really a lot more progressive action within the cam profile is required for a smoother damping effect. I still did not see a photo of the "new" reworked profile and I guess it was just corrected a bit to prevent chipped edges which was another defect due to poorly mating faces - a problem of complicated manufacture. But this does not help with the slamming onto full lock. I have no clue how they did it half a century ago, to achieve an acceptable shape somehow. </p><p></p><p> Vic</p></blockquote><p></p>
[QUOTE="oexing, post: 102556, member: 1493"] Yes, but the original design was wrong from the start - as with other ESAs from pre-war that got copied without thinking . That shallow cam profile may have been allright for 15 hp sidevalvers and maybe one fat spring, so the whole lot survived long enough. But really a lot more progressive action within the cam profile is required for a smoother damping effect. I still did not see a photo of the "new" reworked profile and I guess it was just corrected a bit to prevent chipped edges which was another defect due to poorly mating faces - a problem of complicated manufacture. But this does not help with the slamming onto full lock. I have no clue how they did it half a century ago, to achieve an acceptable shape somehow. Vic [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Twin Primary Chain PD1
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