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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Ditch the ESA ?
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<blockquote data-quote="oexing" data-source="post: 126266" data-attributes="member: 1493"><p>Remember with the standard ESA there is not much space for a lot harder springs, only ca. 7 mm holes for two springs. And lots of spring breakages all the times were reported anyway . They did their best to have maximum spring forces in that space, else you´d need a lot bigger parts for bigger and more powerful springs. Would not know any square section springs in that small dimension suitable for Vincents. </p><p> Also very hard springs will lead to extreme axial loads on inner bearing race and sprocket face and wear as noticed by other owners, up to misalignment of chain runs from this. This matter gets ignored each time when harder springs are discussed here to struggle on with old type ESA . That is why I would not go for hard springs to fight poor lobe shapes as you overload lobe cams from this. So I´d keep the standard springs and only provide a soft stop by o-rings in holes as suggested. Material hardness is not critical as only the soft stop is cared by rubbers , not affecting the whole range of movement in the ESA. This will not help the ESA going onto stops both directions lots of times but then not hard stops as in steel bashings like now. </p><p> So to be open, only a redesign for progressive lobe shapes would be a suitable way but for this we´d need a club vote to have this done . </p><p> I learned from axial faces wear in this forum so made up a special steel bush with maximum faces for the sprocket to bear on which also forms the lip for the outer roller main bearing at the inner side, made possible by having metric modern bearings with lots of choices. When you zoom in in the photo you see the sleeve on the crank end next to rollers and below the sprocket fitted on its place . Don´t know if there are ways to do mods on standard bearings like machining off any radius on inner race and fit a hardened spacer top hat type to get same conditions in the end. Not a brilliant detail in Vincents really, too small faces available for extreme axial loads. </p><p></p><p> Vic</p><p></p><p>[ATTACH=full]36877[/ATTACH]</p><p></p><p>[ATTACH=full]36878[/ATTACH]</p></blockquote><p></p>
[QUOTE="oexing, post: 126266, member: 1493"] Remember with the standard ESA there is not much space for a lot harder springs, only ca. 7 mm holes for two springs. And lots of spring breakages all the times were reported anyway . They did their best to have maximum spring forces in that space, else you´d need a lot bigger parts for bigger and more powerful springs. Would not know any square section springs in that small dimension suitable for Vincents. Also very hard springs will lead to extreme axial loads on inner bearing race and sprocket face and wear as noticed by other owners, up to misalignment of chain runs from this. This matter gets ignored each time when harder springs are discussed here to struggle on with old type ESA . That is why I would not go for hard springs to fight poor lobe shapes as you overload lobe cams from this. So I´d keep the standard springs and only provide a soft stop by o-rings in holes as suggested. Material hardness is not critical as only the soft stop is cared by rubbers , not affecting the whole range of movement in the ESA. This will not help the ESA going onto stops both directions lots of times but then not hard stops as in steel bashings like now. So to be open, only a redesign for progressive lobe shapes would be a suitable way but for this we´d need a club vote to have this done . I learned from axial faces wear in this forum so made up a special steel bush with maximum faces for the sprocket to bear on which also forms the lip for the outer roller main bearing at the inner side, made possible by having metric modern bearings with lots of choices. When you zoom in in the photo you see the sleeve on the crank end next to rollers and below the sprocket fitted on its place . Don´t know if there are ways to do mods on standard bearings like machining off any radius on inner race and fit a hardened spacer top hat type to get same conditions in the end. Not a brilliant detail in Vincents really, too small faces available for extreme axial loads. Vic [ATTACH type="full"]36877[/ATTACH] [ATTACH type="full"]36878[/ATTACH] [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Ditch the ESA ?
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