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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Series D oil tank
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<blockquote data-quote="davidd" data-source="post: 92291" data-attributes="member: 1177"><p>Greg is certainly correct about the chain oiler being a vent on the Series B UFM's as there was no metering screw. The same could be applied to the Series C UFM's in general. I was under the impression that with the metering screw fully seated there would be no flow of oil or air down the tube resulting in the plug at the rear being redundant. For this reason I did not view the chain oiler as a vent for the oil tank on the Series C RFM's.</p><p></p><p>I have never run an chain oiler and always blocked off the the feed at the rear of the UFM and I have not to date needed any more than the oil cap to vent the oil tank. If I did have an oil tank breathing problem I would consider using the chain oiler tube as a vent. The cap has always been a sufficient vent. </p><p></p><p>I do like the Egli oil view tube. It is a much better way to monitor the oil flow. I think the Vincent block that is brazed in the filler neck should have had a down tube attached. Shooting the oil out to smash into the other side of the filler neck right next to any vent hole is an invitation for a mess. Most owners do not rev to 7000, but if you pulled of my cap at 7000 rpm you would have an oilnado even with the modest pressure Vincent oil pump. I think the racers were prone to this. </p><p></p><p>I must admit that I usually enlarge the vent holes in the caps a drill size or so bigger.</p><p></p><p>The smaller sketch of the tubes below and to the right of the drawing is drawn as a view from the rear of the RFM, so the feed pipe to the engine is on the left, the chain oiler on the right and the return tube is further up front in the middle of the tank.</p><p></p><p>David</p></blockquote><p></p>
[QUOTE="davidd, post: 92291, member: 1177"] Greg is certainly correct about the chain oiler being a vent on the Series B UFM's as there was no metering screw. The same could be applied to the Series C UFM's in general. I was under the impression that with the metering screw fully seated there would be no flow of oil or air down the tube resulting in the plug at the rear being redundant. For this reason I did not view the chain oiler as a vent for the oil tank on the Series C RFM's. I have never run an chain oiler and always blocked off the the feed at the rear of the UFM and I have not to date needed any more than the oil cap to vent the oil tank. If I did have an oil tank breathing problem I would consider using the chain oiler tube as a vent. The cap has always been a sufficient vent. I do like the Egli oil view tube. It is a much better way to monitor the oil flow. I think the Vincent block that is brazed in the filler neck should have had a down tube attached. Shooting the oil out to smash into the other side of the filler neck right next to any vent hole is an invitation for a mess. Most owners do not rev to 7000, but if you pulled of my cap at 7000 rpm you would have an oilnado even with the modest pressure Vincent oil pump. I think the racers were prone to this. I must admit that I usually enlarge the vent holes in the caps a drill size or so bigger. The smaller sketch of the tubes below and to the right of the drawing is drawn as a view from the rear of the RFM, so the feed pipe to the engine is on the left, the chain oiler on the right and the return tube is further up front in the middle of the tank. David [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Series D oil tank
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