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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Oil consumption
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<blockquote data-quote="davidd" data-source="post: 133006" data-attributes="member: 1177"><p>Robin,</p><p></p><p>It is hard to figure out the problem from the symptoms. It could be possible that the symptoms are not important. </p><p></p><p></p><p>I would think the answer to this is no. I cannot remember an owner with this type of problem. But your two questions are related:</p><p></p><p>I think that you are leaving out some of the oil movement in the case. When the sump fills with oil during non-use, upon start-up the sump would certainly be overfilled. You describe the symptoms of sumping, but I can see that you think it is happening with the engine running. When the engine is running the oil that makes its way to the sump is picked up by the flywheels, scraped off the wheels into the scavenge chamber at the rear of the sump. The oil that is carried into the scavenging chamber is pumped from the scavenging chamber by the bottom of the oil pump and pushed up the oil line that goes to the rockers on its way back to the tank return. </p><p></p><p>I mention this because the scavenging portion of the pump will evacuate the scavenging chamber at a very high rate. I understand this scavenge pumping rate to be much higher than the rate that the front of the oil pump supplies oil to the chest.</p><p></p><p>The revving of the engine will dump some oil in the scavenging chamber (from the flywheels slinging more oil) and it will get pumped up to the tank very quickly. This may be the "overdrive" that you are witnessing. The smoke in the exhaust could be from oil in the tunnels flooding the valve guides momentarily. The oil supply to the chest is "non-interruptible", while the oil supply from the scavenging chamber is "interruptible" because the scavenging chamber can be run dry or close to it during idle.</p><p></p><p>David</p></blockquote><p></p>
[QUOTE="davidd, post: 133006, member: 1177"] Robin, It is hard to figure out the problem from the symptoms. It could be possible that the symptoms are not important. I would think the answer to this is no. I cannot remember an owner with this type of problem. But your two questions are related: I think that you are leaving out some of the oil movement in the case. When the sump fills with oil during non-use, upon start-up the sump would certainly be overfilled. You describe the symptoms of sumping, but I can see that you think it is happening with the engine running. When the engine is running the oil that makes its way to the sump is picked up by the flywheels, scraped off the wheels into the scavenge chamber at the rear of the sump. The oil that is carried into the scavenging chamber is pumped from the scavenging chamber by the bottom of the oil pump and pushed up the oil line that goes to the rockers on its way back to the tank return. I mention this because the scavenging portion of the pump will evacuate the scavenging chamber at a very high rate. I understand this scavenge pumping rate to be much higher than the rate that the front of the oil pump supplies oil to the chest. The revving of the engine will dump some oil in the scavenging chamber (from the flywheels slinging more oil) and it will get pumped up to the tank very quickly. This may be the "overdrive" that you are witnessing. The smoke in the exhaust could be from oil in the tunnels flooding the valve guides momentarily. The oil supply to the chest is "non-interruptible", while the oil supply from the scavenging chamber is "interruptible" because the scavenging chamber can be run dry or close to it during idle. David [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Oil consumption
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