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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Cam Suppliers
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<blockquote data-quote="oexing" data-source="post: 110208" data-attributes="member: 1493"><p>Norman, simple mod, just fabricate some loose hardened steel bushes for spacers between needle sets. The genuine Andrews cam sets had very large chamfers at the ends so I made chamfered rings as well to keep the needles at their place. The spacers are nice push fit on the shafts but half a mm smaller o.d. in the cam spindles, for not obstructing oil flow along the shafts. </p><p> By the way, the layshafts in car gear boxes have typically crowded needle rollers at their ends for max. loads when e.g. in first gear and very high load in that state. Even in some gearboxes the individual gears got crowded needle bearings in them - just remembering the old Moss box on our 3.8 E-Type. </p><p> I do have some affection for crowded needle bearings - after decent considerations about operating conditions and suitability for that type of bearing. Certainly you would not decide on this when expecting very high speeds. The classic Guzzi singles up to the late sixties had crowded needle big end bearings for many decades , 3.5 mm needles 25mm long, - and that with split conrods due to one piece cranks !! No problems with that, at least no risk of breaking stone age brass cages in big ends as is a big thing today with vintage bikes still on the old cages.</p><p></p><p> Vic</p><p></p><p>[ATTACH=full]28849[/ATTACH]</p></blockquote><p></p>
[QUOTE="oexing, post: 110208, member: 1493"] Norman, simple mod, just fabricate some loose hardened steel bushes for spacers between needle sets. The genuine Andrews cam sets had very large chamfers at the ends so I made chamfered rings as well to keep the needles at their place. The spacers are nice push fit on the shafts but half a mm smaller o.d. in the cam spindles, for not obstructing oil flow along the shafts. By the way, the layshafts in car gear boxes have typically crowded needle rollers at their ends for max. loads when e.g. in first gear and very high load in that state. Even in some gearboxes the individual gears got crowded needle bearings in them - just remembering the old Moss box on our 3.8 E-Type. I do have some affection for crowded needle bearings - after decent considerations about operating conditions and suitability for that type of bearing. Certainly you would not decide on this when expecting very high speeds. The classic Guzzi singles up to the late sixties had crowded needle big end bearings for many decades , 3.5 mm needles 25mm long, - and that with split conrods due to one piece cranks !! No problems with that, at least no risk of breaking stone age brass cages in big ends as is a big thing today with vintage bikes still on the old cages. Vic [ATTACH type="full"]28849[/ATTACH] [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Cam Suppliers
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