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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Oil loss through breather pipe
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<blockquote data-quote="timetraveller" data-source="post: 16530" data-attributes="member: 456"><p>Oh Dear! I can see that new boy Tony is going to get more advice than he can handle. I have fitted twin start oil pumps to all my engines for years, both racing and road. My idea is that it gets the oil to places that need it more quickly and anyone who looks at the oil returning through the opened cap on the oil filler neck will see the spasmodic blob-blob of the returning oil. Yes the single start pump will work very well and Ron Vane told me years ago that he used such a pump on 'The Thing' when he broke the world record. Many other people are also very happy with the original pumps. However, and this is where I start to disagree with Tom, removing the metering wire should not cause the problems which you have. It is very simple really, the capacity of the return side of the pump is much larger than that of the feed side and indeed if it were not then the whole system would quickly fail. Consider as well that the return oil is picked up only from inside the chamber behind the crankcase scraper. The whole system relies upon that scraper getting all the oil that is flung from the flywheels, which in turn pick it up from where ever is comes from, and collecting it for the return. In fact there are many of us who believe that the oil metering wires should be removed to allow more oil to flow down the push rod tubes and help to lubricate the cams and followers. Poor Tony is now going to get some conflicting advice. </p><p> </p><p>I would not dismantle bits on top of the engine and replace metering wires. They should not be necessary. Instead I would go for a ride of a few miles and then as soon as you get back drain all the oil from the crankcase and see how much you have. There should be very little as the flywheel/scraper and over-sized return pump should be keeping the inside of the crankcase relatively dry. Even allowing for drain down of internal surfaces you should not have more than, say, about a cup full. More than that and there is a problem. In principle the feed side of the pump cannot push round more oil than the return side can pick up so it should not matter how the oil is being circulated, the crankcase should stay relatively dry. If you are getting a build up of oil in the crankcase then you should be looking for either a badly fitting return pump, a partial blocking of the feed to the return pump possibly due to gasket sealer or broken bits of metal getting into the feed or the return pipe from the pump which goes over the cylinder heads etc being partly blocked. It does not need very much gasket sealer in a pipe or banjo bolt to cause a blockage as the Vincent pump is not designed to give any significant pressure. Happy hunting</p></blockquote><p></p>
[QUOTE="timetraveller, post: 16530, member: 456"] Oh Dear! I can see that new boy Tony is going to get more advice than he can handle. I have fitted twin start oil pumps to all my engines for years, both racing and road. My idea is that it gets the oil to places that need it more quickly and anyone who looks at the oil returning through the opened cap on the oil filler neck will see the spasmodic blob-blob of the returning oil. Yes the single start pump will work very well and Ron Vane told me years ago that he used such a pump on 'The Thing' when he broke the world record. Many other people are also very happy with the original pumps. However, and this is where I start to disagree with Tom, removing the metering wire should not cause the problems which you have. It is very simple really, the capacity of the return side of the pump is much larger than that of the feed side and indeed if it were not then the whole system would quickly fail. Consider as well that the return oil is picked up only from inside the chamber behind the crankcase scraper. The whole system relies upon that scraper getting all the oil that is flung from the flywheels, which in turn pick it up from where ever is comes from, and collecting it for the return. In fact there are many of us who believe that the oil metering wires should be removed to allow more oil to flow down the push rod tubes and help to lubricate the cams and followers. Poor Tony is now going to get some conflicting advice. I would not dismantle bits on top of the engine and replace metering wires. They should not be necessary. Instead I would go for a ride of a few miles and then as soon as you get back drain all the oil from the crankcase and see how much you have. There should be very little as the flywheel/scraper and over-sized return pump should be keeping the inside of the crankcase relatively dry. Even allowing for drain down of internal surfaces you should not have more than, say, about a cup full. More than that and there is a problem. In principle the feed side of the pump cannot push round more oil than the return side can pick up so it should not matter how the oil is being circulated, the crankcase should stay relatively dry. If you are getting a build up of oil in the crankcase then you should be looking for either a badly fitting return pump, a partial blocking of the feed to the return pump possibly due to gasket sealer or broken bits of metal getting into the feed or the return pipe from the pump which goes over the cylinder heads etc being partly blocked. It does not need very much gasket sealer in a pipe or banjo bolt to cause a blockage as the Vincent pump is not designed to give any significant pressure. Happy hunting [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Oil loss through breather pipe
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