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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Oil, is there a definitive answer?
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<blockquote data-quote="oexing" data-source="post: 172550" data-attributes="member: 1493"><p>Skidding rollers - OWT I say. When actually skidding, there would not be any wear ?? Poor oil supply to the front cylinder - no, you´d have a seized piston there long before the big end bearing would go ! Roller and ball bearings are very sensitive to grit in the oil. That is why filters or an effective sump are so important in preventing bearing failures. Defects start with very fine surface imperfections and mini craters and progress in the long run into total destruction. Also hardness specifications might be a factor when one conrod was allright and only the other failed. </p><p> I don´t know much about those crank pins and their oil hole orientations when designed for a twin. I position my holes at 90 degrees to the rear , past TDC so to say. Effect is you get a level of oil in the drilled crankpin that supplies oil evenly into both bearings, no matter which is closer to the oil entering the crankpin from one end. And yes, oil holes not in line with rollers but both sides where the cage ends float in the conrod. </p><p></p><p> Vic</p><p></p><p>Ducati 860 conrod 35 000 km:</p><p>[ATTACH=full]59466[/ATTACH]</p><p></p><p>[ATTACH=full]59467[/ATTACH]</p><p></p><p>Vic`s special:</p><p>[ATTACH=full]59468[/ATTACH]</p></blockquote><p></p>
[QUOTE="oexing, post: 172550, member: 1493"] Skidding rollers - OWT I say. When actually skidding, there would not be any wear ?? Poor oil supply to the front cylinder - no, you´d have a seized piston there long before the big end bearing would go ! Roller and ball bearings are very sensitive to grit in the oil. That is why filters or an effective sump are so important in preventing bearing failures. Defects start with very fine surface imperfections and mini craters and progress in the long run into total destruction. Also hardness specifications might be a factor when one conrod was allright and only the other failed. I don´t know much about those crank pins and their oil hole orientations when designed for a twin. I position my holes at 90 degrees to the rear , past TDC so to say. Effect is you get a level of oil in the drilled crankpin that supplies oil evenly into both bearings, no matter which is closer to the oil entering the crankpin from one end. And yes, oil holes not in line with rollers but both sides where the cage ends float in the conrod. Vic Ducati 860 conrod 35 000 km: [ATTACH type="full"]59466[/ATTACH] [ATTACH type="full"]59467[/ATTACH] Vic`s special: [ATTACH type="full"]59468[/ATTACH] [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Oil, is there a definitive answer?
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