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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: 110972" data-attributes="member: 1493"><p>Norman,</p><p>I have never come across nitrided cranks in pressed up designs, usually nitriding is only done to plain bearing car or truck engine cranks to extend life of journals. You may be right with very poor quality low strength material but then I would never accept crappy steel in my engines. </p><p> The original Vincent cranks are not overly hard steel, allright, but application of a good EP lubricant on the crank pin and bore should be good to save press fits without seizures. But then, a standard Vincent crank web is not suitable for parallel press fits, the bore just too short for a rigid assembly, due to the counterbore for the crankpin nut. For a 40 mm pin I machine the crank bore 0.10-0.11 mm undersize so this is quite some press fit. The pin has to have a nice polished radius at its edge so as not to score the bore - plus some EP lubricant. </p><p></p><p> Vic</p></blockquote><p></p>
[QUOTE="oexing, post: 110972, member: 1493"] Norman, I have never come across nitrided cranks in pressed up designs, usually nitriding is only done to plain bearing car or truck engine cranks to extend life of journals. You may be right with very poor quality low strength material but then I would never accept crappy steel in my engines. The original Vincent cranks are not overly hard steel, allright, but application of a good EP lubricant on the crank pin and bore should be good to save press fits without seizures. But then, a standard Vincent crank web is not suitable for parallel press fits, the bore just too short for a rigid assembly, due to the counterbore for the crankpin nut. For a 40 mm pin I machine the crank bore 0.10-0.11 mm undersize so this is quite some press fit. The pin has to have a nice polished radius at its edge so as not to score the bore - plus some EP lubricant. Vic [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Big end needle roller bearings
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