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<blockquote data-quote="timetraveller" data-source="post: 20142" data-attributes="member: 456"><p><span style="font-family: 'Times New Roman'"><span style="font-size: 12px">Sorry to disagree with Tom on this but I have been using twin start pumps for about 45 years for both road use and a bit of racing and sprinting. If you look at the design of the Vincent pump then the scavenge/return side cannot be overwhelmed as it has a larger capacity than the feed side. If it was really being overwhelmed then the crank case would fill up with oil. A restricted return pipe could cause trouble with the return flow, as could either a damaged scraper in the crank case or reduced diameter flywheels with a standard dimensioned scraper. Whether the twin start pumps are thought to be necessary or not, there are enough of us using them to be sure that the design is not the cause of any over oiling.</span></span></p><p> </p><p><span style="font-family: 'Times New Roman'"><span style="font-size: 12px">What is the capacity of your catch tank Tom? To fill it up after a hundred and fifty miles does not sound right. I know one very hard and long distance rider who fitted close clearance pistons and sealed valve guides and does not need to put any oil in between oil changes. He has a ‘D’ with the standard breather and oil pump and clearly is not pumping any significant amount of oil out.</span></span></p></blockquote><p></p>
[QUOTE="timetraveller, post: 20142, member: 456"] [FONT=Times New Roman][SIZE=3]Sorry to disagree with Tom on this but I have been using twin start pumps for about 45 years for both road use and a bit of racing and sprinting. If you look at the design of the Vincent pump then the scavenge/return side cannot be overwhelmed as it has a larger capacity than the feed side. If it was really being overwhelmed then the crank case would fill up with oil. A restricted return pipe could cause trouble with the return flow, as could either a damaged scraper in the crank case or reduced diameter flywheels with a standard dimensioned scraper. Whether the twin start pumps are thought to be necessary or not, there are enough of us using them to be sure that the design is not the cause of any over oiling.[/SIZE][/FONT] [FONT=Times New Roman][SIZE=3] [/SIZE][/FONT] [FONT=Times New Roman][SIZE=3]What is the capacity of your catch tank Tom? To fill it up after a hundred and fifty miles does not sound right. I know one very hard and long distance rider who fitted close clearance pistons and sealed valve guides and does not need to put any oil in between oil changes. He has a ‘D’ with the standard breather and oil pump and clearly is not pumping any significant amount of oil out.[/SIZE][/FONT] [/QUOTE]
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