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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Big end needle roller bearings
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<blockquote data-quote="oexing" data-source="post: 110961" data-attributes="member: 1493"><p>The IKO Nippon co. only lists KT types. The critical design feature are the faces at both ends of the rollers. You get immense centrifugal forces on the cage when located on a crank pin. For this condition INA designed extra large faces on the KZ cages so they can float on the oil film inside the big end bore. The cage is NOT a close fit on the crank pin , instead it operates with about 0,20 mm clearance within the big end bore and needs these faces with oil film to be supported in the rod . Other types of needle bearings will not be suitable for this application. </p><p>Look at the darker older type INA KZK cage in my photo above, it had even longer faces compared to the last types. So I cannot tell from the PDF IKO pictures if their bearings may be suitable. </p><p></p><p> Vic</p></blockquote><p></p>
[QUOTE="oexing, post: 110961, member: 1493"] The IKO Nippon co. only lists KT types. The critical design feature are the faces at both ends of the rollers. You get immense centrifugal forces on the cage when located on a crank pin. For this condition INA designed extra large faces on the KZ cages so they can float on the oil film inside the big end bore. The cage is NOT a close fit on the crank pin , instead it operates with about 0,20 mm clearance within the big end bore and needs these faces with oil film to be supported in the rod . Other types of needle bearings will not be suitable for this application. Look at the darker older type INA KZK cage in my photo above, it had even longer faces compared to the last types. So I cannot tell from the PDF IKO pictures if their bearings may be suitable. Vic [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Big end needle roller bearings
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