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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="davidd" data-source="post: 172678" data-attributes="member: 1177"><p>I don't think you received an accurate diagnosis. Synthetic oils work fine in Vincent engines. The problem is not caused by lack of friction, but too much oil in a conrod roller bearing. As the roller turns, the oil creates a "bow wave" as the roller plows the excess oil in front. The oil tries to exit underneath the roller, but there is not enough clearance in the bearing for that to happen. The result is that the roller tends to stall and it begins skipping. This causes heat damage as well as mechanical damage.</p><p></p><p>Generally, the solution is to verify that the oil cannot build up inside the bearing by increasing the clearance on both sides of the rod. As long as oil is dribbling into the flywheel, the exit doors for the oil can be wide open. You do not want any extra oil building up in the bearings because the oil cannot get out. Extra oil in the rod creates a hydraulic problem not a "slipperiness" problem. Conventional oil would do the same thing with too little side clearance for the rod. This has happened quite a lot in Vincent engines over the years.</p><p></p><p>David</p></blockquote><p></p>
[QUOTE="davidd, post: 172678, member: 1177"] I don't think you received an accurate diagnosis. Synthetic oils work fine in Vincent engines. The problem is not caused by lack of friction, but too much oil in a conrod roller bearing. As the roller turns, the oil creates a "bow wave" as the roller plows the excess oil in front. The oil tries to exit underneath the roller, but there is not enough clearance in the bearing for that to happen. The result is that the roller tends to stall and it begins skipping. This causes heat damage as well as mechanical damage. Generally, the solution is to verify that the oil cannot build up inside the bearing by increasing the clearance on both sides of the rod. As long as oil is dribbling into the flywheel, the exit doors for the oil can be wide open. You do not want any extra oil building up in the bearings because the oil cannot get out. Extra oil in the rod creates a hydraulic problem not a "slipperiness" problem. Conventional oil would do the same thing with too little side clearance for the rod. This has happened quite a lot in Vincent engines over the years. David [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Oil, is there a definitive answer?
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