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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
ET77 Main bearing distance piece
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<blockquote data-quote="timetraveller" data-source="post: 36730" data-attributes="member: 456"><p>If you think about it, having the inner of the ET92s close up against the flywheels makes for a very stiff assembly so I would not recommend moving the whole bearing over. Vincents used special bearings with one side of the outer race ground back to give clearance with the crankpin nuts. What people have been doing over the last decade or two is to machine one side of the ET19 back to allow use of a full width outer race, pushed outwards so that there is now more bearing face between the outside of this race and the crankcase main bearing housing. This means that the rollers now run offset from the centre of outer race but that does not seem to be causing any problems. I would not want to argue with Rip Tragle. He tells us that he has only built road bikes but that some of these were so fast that a 150 mph Shadow speedo was not adequate and he had to resort to Lightning 180 mph speedos. I have to tell you that most of us could not do that. So he might be correct about the inadequacies of sand cast crankcases but I would still check the fit of the old bearings first before resorting to line boring the whole lot. If the bearings are loose then there is a very nice and elegant mod that was put into this Forum some time ago by ex-editor of MPH, Robert Watson. It consists of a new steel flanged housing for the drive side with the flange on the outside (ESA side). This takes two back to back taper roller bearings to support the mainshaft and houses an oil seal on the outer side. It is a nice way of saving a drive side crankcase and is probably a better scheme than the original.</p></blockquote><p></p>
[QUOTE="timetraveller, post: 36730, member: 456"] If you think about it, having the inner of the ET92s close up against the flywheels makes for a very stiff assembly so I would not recommend moving the whole bearing over. Vincents used special bearings with one side of the outer race ground back to give clearance with the crankpin nuts. What people have been doing over the last decade or two is to machine one side of the ET19 back to allow use of a full width outer race, pushed outwards so that there is now more bearing face between the outside of this race and the crankcase main bearing housing. This means that the rollers now run offset from the centre of outer race but that does not seem to be causing any problems. I would not want to argue with Rip Tragle. He tells us that he has only built road bikes but that some of these were so fast that a 150 mph Shadow speedo was not adequate and he had to resort to Lightning 180 mph speedos. I have to tell you that most of us could not do that. So he might be correct about the inadequacies of sand cast crankcases but I would still check the fit of the old bearings first before resorting to line boring the whole lot. If the bearings are loose then there is a very nice and elegant mod that was put into this Forum some time ago by ex-editor of MPH, Robert Watson. It consists of a new steel flanged housing for the drive side with the flange on the outside (ESA side). This takes two back to back taper roller bearings to support the mainshaft and houses an oil seal on the outer side. It is a nice way of saving a drive side crankcase and is probably a better scheme than the original. [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
ET77 Main bearing distance piece
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