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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
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<blockquote data-quote="greg brillus" data-source="post: 128573" data-attributes="member: 597"><p>Hi there Vic........ I will say I'm a bit of a novice on these cranks, as I use to get them done by Laurie Binns down in Victoria.........he was a well known and respected machinist all his life and he generally replaced the main shafts in near all the many Vincent cranks he did over a long time. He explained to me that the stock Vincent flywheels where no more than boiler pate, and that their interference fit on the mains and big end was ok but not great.......The flywheel material has very little memory and so once the shafts have been pressed in they tend to loose a lot once removed. Because the shafts are only 1 inch in diameter the surface area is quite small for such a capable engine........I'm not sure if they rotate due to sudden stoppage, or just in long service and perhaps too much back and forth movement of the stock ESA........The shafts we use are stepped with the flywheel section at 30mm in diameter, then reduced back to the 1 inch from there. We decided not to pin this shaft, but a keyway is probably a good idea.......It is hard to come up with a fix for everything......Only folk with your skills can recommend what to do there. Cheers.........Greg.</p></blockquote><p></p>
[QUOTE="greg brillus, post: 128573, member: 597"] Hi there Vic........ I will say I'm a bit of a novice on these cranks, as I use to get them done by Laurie Binns down in Victoria.........he was a well known and respected machinist all his life and he generally replaced the main shafts in near all the many Vincent cranks he did over a long time. He explained to me that the stock Vincent flywheels where no more than boiler pate, and that their interference fit on the mains and big end was ok but not great.......The flywheel material has very little memory and so once the shafts have been pressed in they tend to loose a lot once removed. Because the shafts are only 1 inch in diameter the surface area is quite small for such a capable engine........I'm not sure if they rotate due to sudden stoppage, or just in long service and perhaps too much back and forth movement of the stock ESA........The shafts we use are stepped with the flywheel section at 30mm in diameter, then reduced back to the 1 inch from there. We decided not to pin this shaft, but a keyway is probably a good idea.......It is hard to come up with a fix for everything......Only folk with your skills can recommend what to do there. Cheers.........Greg. [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
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