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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Rapide Chain Problem
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<blockquote data-quote="oexing" data-source="post: 156661" data-attributes="member: 1493"><p>When a tightly mounted dynamo can produce split rollers in the triplex chain I´d be worried a lot about wrecked bearings in the dynamo ! At least in the Miller type the bearings are not particularly massiv so I would not think they´d last long in this situation. </p><p> What is current thinking about snapping chains and the reason for this ? Would not imagine it is the power of the engine. Same types of chains in Commandos and Laverdas but different ESAs or none . In case of Laverdas they have gone to 2 single row chains as triplex types no more available. No choice for Vincents as you want a dynamo drive from the middle rollers. They change chains in 20 000 km intervals for safety aspects - cheap enough I´d think. </p><p> The Harley ESA is old logic still, not overly great. There is no good reason to have same lobe shapes for both sides as you don´t get the space for geometrically progressive lobes with springs not responsible for providing a stop. That is why Japanese engines don´t adopt this old design - instead go like BMW for half a century. So in that design you don´t get same side loads from very hard springs as the steep ramp of lobes does the job. High spring forces in Vincents eat into the sprocket and ball main bearing inner race faces , no thrust bearing in there.</p><p> The springs look like Belleville dished washers ? I was thinking about these in my engines but was not quite sure about lifetime in engines. So I kept the small standard springs. See the HD dupex chain sprocket in photo above, obviously good enough there. So what is the root of snapped chains in Vincents - very long use , no changes in decades ?? </p><p></p><p> Vic</p></blockquote><p></p>
[QUOTE="oexing, post: 156661, member: 1493"] When a tightly mounted dynamo can produce split rollers in the triplex chain I´d be worried a lot about wrecked bearings in the dynamo ! At least in the Miller type the bearings are not particularly massiv so I would not think they´d last long in this situation. What is current thinking about snapping chains and the reason for this ? Would not imagine it is the power of the engine. Same types of chains in Commandos and Laverdas but different ESAs or none . In case of Laverdas they have gone to 2 single row chains as triplex types no more available. No choice for Vincents as you want a dynamo drive from the middle rollers. They change chains in 20 000 km intervals for safety aspects - cheap enough I´d think. The Harley ESA is old logic still, not overly great. There is no good reason to have same lobe shapes for both sides as you don´t get the space for geometrically progressive lobes with springs not responsible for providing a stop. That is why Japanese engines don´t adopt this old design - instead go like BMW for half a century. So in that design you don´t get same side loads from very hard springs as the steep ramp of lobes does the job. High spring forces in Vincents eat into the sprocket and ball main bearing inner race faces , no thrust bearing in there. The springs look like Belleville dished washers ? I was thinking about these in my engines but was not quite sure about lifetime in engines. So I kept the small standard springs. See the HD dupex chain sprocket in photo above, obviously good enough there. So what is the root of snapped chains in Vincents - very long use , no changes in decades ?? Vic [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Rapide Chain Problem
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