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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Conways Anti Sumping Valve on Twin start pumps
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<blockquote data-quote="Peter Holmes" data-source="post: 43870" data-attributes="member: 302"><p>Question, My Rapide wet sumps horribly, I don't think it did in my early years of ownership from 1965 on, but then I did use the bike pretty much every day, but following a total rebuild by a very well respected Vincent engineer it wet sumps, it is not a problem if I use the bike every day or even once a week, but after that I would need to drain the sump before attempting to start. I did purchase a few years back a Conways anti sumping device but as yet lack the courage to install it, my fear is that as the pump is clearly leaky/inefficient, would it have sufficient power to lift the sprung loaded ball bearing off its seat to allow the full flow of the oil, I believe that some experts are of opinion that at best the standard pump is a bit marginal, by the way, I am not an engineer and do not have an opinion on that. The Conways device seems to require an enormous amount of human suction, about the same effort as when you first try to inflate a balloon but in reverse. I seem to remember Marcus Bowden removing one from a fellow rallyists Vincent whilst in Ireland, I believe the machine was overheating and on the verge of siezing, removing the device solved the problem, might have been Henry Martini, not 100% sure.</p><p>I am sure the device is good and is well tested and it is not my intention to "rubbish" it, but my question is, is the device OK to use with leaky pump that presumably is not working to full efficiency when taking into account that is what it is designed to be used for.</p></blockquote><p></p>
[QUOTE="Peter Holmes, post: 43870, member: 302"] Question, My Rapide wet sumps horribly, I don't think it did in my early years of ownership from 1965 on, but then I did use the bike pretty much every day, but following a total rebuild by a very well respected Vincent engineer it wet sumps, it is not a problem if I use the bike every day or even once a week, but after that I would need to drain the sump before attempting to start. I did purchase a few years back a Conways anti sumping device but as yet lack the courage to install it, my fear is that as the pump is clearly leaky/inefficient, would it have sufficient power to lift the sprung loaded ball bearing off its seat to allow the full flow of the oil, I believe that some experts are of opinion that at best the standard pump is a bit marginal, by the way, I am not an engineer and do not have an opinion on that. The Conways device seems to require an enormous amount of human suction, about the same effort as when you first try to inflate a balloon but in reverse. I seem to remember Marcus Bowden removing one from a fellow rallyists Vincent whilst in Ireland, I believe the machine was overheating and on the verge of siezing, removing the device solved the problem, might have been Henry Martini, not 100% sure. I am sure the device is good and is well tested and it is not my intention to "rubbish" it, but my question is, is the device OK to use with leaky pump that presumably is not working to full efficiency when taking into account that is what it is designed to be used for. [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Conways Anti Sumping Valve on Twin start pumps
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