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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Comet Big End
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<blockquote data-quote="Cyborg" data-source="post: 177010" data-attributes="member: 3426"><p>That is odd because I have never measured a Vincent big end eye that was not oval to some degree. It was enough of a problem that Alpha produced a publication regarding “Special Big End Bearings for Vincent Motorcycles“. and they stated that to get maximum benefit from the caged roller it is desirable to grind the outer races internally after they are pressed into the connecting rods so that any ovality caused by distorted rods will be removed.</p><p>This problem was also discussed in some of their other literature and they mention supplying a partly finished outer race that needs to be sized after installation. There are NOS Alpha big end bearings floating around that come with the outer race pre- fitted, but better to toss the outer race and purchase one that can be sized after installation. If the outer race is only slightly oval, then it’ll likely survive ok given how these bikes are used, but Alpha’s advice to size them after installation is a much better way to go. Even if the rod eye is round, there is a good chance it won’t be after the race is pressed in.</p></blockquote><p></p>
[QUOTE="Cyborg, post: 177010, member: 3426"] That is odd because I have never measured a Vincent big end eye that was not oval to some degree. It was enough of a problem that Alpha produced a publication regarding “Special Big End Bearings for Vincent Motorcycles“. and they stated that to get maximum benefit from the caged roller it is desirable to grind the outer races internally after they are pressed into the connecting rods so that any ovality caused by distorted rods will be removed. This problem was also discussed in some of their other literature and they mention supplying a partly finished outer race that needs to be sized after installation. There are NOS Alpha big end bearings floating around that come with the outer race pre- fitted, but better to toss the outer race and purchase one that can be sized after installation. If the outer race is only slightly oval, then it’ll likely survive ok given how these bikes are used, but Alpha’s advice to size them after installation is a much better way to go. Even if the rod eye is round, there is a good chance it won’t be after the race is pressed in. [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Comet Big End
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