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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
anti sumping valve
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<blockquote data-quote="timetraveller" data-source="post: 20840" data-attributes="member: 456"><p><span style="font-family: 'Times New Roman'">Oh dear! Only the fifth day of the year and I already have to disagree with someone. Derek might be correct in principal but in reality just how much oil leaks around the outside of the pump housing and how much between the plunger and the sleeve? Can we really expect that enough oil is going to force its way through some very narrow gaps to continue to allow the return side to continuously pump oil back through the filler neck when there is a much easier flow route through the intended route? If you were an oil molecule which route would you take?</span></p><p><span style="font-family: 'Times New Roman'">On the subject of wearing cams; there were a few examples of original cams lasting for decades but these were the rarity. I suspect that the quality control on the original cams was poor. When I started tuning my own bike and those of others in about 1960 I would look through boxes of new MkII cams to find ones where there was not a flat at the start or end of the lift. These flats could be seen by eye. If they could not even get the shape correct then there is no reason to expect that the hardening would be any more competent. The lever action of the Vincent cam design means that there is much more pressure at part of the cycle than there would be if the cams had a straight lift. This cannot help but it is noticeable that Stellited cams and followers do not wear.</span></p></blockquote><p></p>
[QUOTE="timetraveller, post: 20840, member: 456"] [FONT=Times New Roman]Oh dear! Only the fifth day of the year and I already have to disagree with someone. Derek might be correct in principal but in reality just how much oil leaks around the outside of the pump housing and how much between the plunger and the sleeve? Can we really expect that enough oil is going to force its way through some very narrow gaps to continue to allow the return side to continuously pump oil back through the filler neck when there is a much easier flow route through the intended route? If you were an oil molecule which route would you take?[/FONT] [FONT=Times New Roman]On the subject of wearing cams; there were a few examples of original cams lasting for decades but these were the rarity. I suspect that the quality control on the original cams was poor. When I started tuning my own bike and those of others in about 1960 I would look through boxes of new MkII cams to find ones where there was not a flat at the start or end of the lift. These flats could be seen by eye. If they could not even get the shape correct then there is no reason to expect that the hardening would be any more competent. The lever action of the Vincent cam design means that there is much more pressure at part of the cycle than there would be if the cams had a straight lift. This cannot help but it is noticeable that Stellited cams and followers do not wear.[/FONT] [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
anti sumping valve
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