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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Cam Wear
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<blockquote data-quote="timetraveller" data-source="post: 93626" data-attributes="member: 456"><p>I'm not sure you are right about that Vic. A small gedanken experiment for you. Suppose that the two start pump gives twice as much oil flow, then restrict one of the apertures it flows through. What will happen. I guess that we have all done this with a hosepipe. Get the water flowing and then squeeze the end of the pipe with your fingers. You know what happens. The water goes further. There is no more water flowing but the pressure has gone up. One restriction with the Vincent oil return flow is the four small holes in the banjo bolt underneath the oil tank. More oil flowing through that, and other restrictions, will increase the pressure so that all those little holes further down the return will be subject to more pressure and hopefully pass more oil. I don't think that it has anything to do with the ratio of scavenge to feed side of the pumps. Provided that the scavenge is greater than the feed the sump will stay 'dry', which is part of what we are after. Tell me where I am wrong with this if I am.</p></blockquote><p></p>
[QUOTE="timetraveller, post: 93626, member: 456"] I'm not sure you are right about that Vic. A small gedanken experiment for you. Suppose that the two start pump gives twice as much oil flow, then restrict one of the apertures it flows through. What will happen. I guess that we have all done this with a hosepipe. Get the water flowing and then squeeze the end of the pipe with your fingers. You know what happens. The water goes further. There is no more water flowing but the pressure has gone up. One restriction with the Vincent oil return flow is the four small holes in the banjo bolt underneath the oil tank. More oil flowing through that, and other restrictions, will increase the pressure so that all those little holes further down the return will be subject to more pressure and hopefully pass more oil. I don't think that it has anything to do with the ratio of scavenge to feed side of the pumps. Provided that the scavenge is greater than the feed the sump will stay 'dry', which is part of what we are after. Tell me where I am wrong with this if I am. [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Cam Wear
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