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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Oil Viscosity
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<blockquote data-quote="davidd" data-source="post: 95360" data-attributes="member: 1177"><p>Tommy,</p><p></p><p>It is a little difficult for me to answer because it is a racing bike that is being tested. 250ml does not sound excessive. I used to run the oil for two meets, but there is so much metal in it I went to changing it every meet. I would have some oil in the sump when I did not change it every meet.</p><p></p><p>David Tompkins first alerted me to the lower viscosity issue and I was reminded by Martyn that Mr. Irving seemed inclined to lower viscosity oils. We have been testing lower viscosity oils that have incredibly high wear resistance (best for flat tappets). Interestingly, there are no high ZDDP oils that test well enough to get high marks in the high film strength tests (none in the top ten, I believe). The oils that are being tested are in the 5W30 range.</p><p></p><p>So far the oil has shown higher temps in the UFM than the higher viscosity oils. To me, this a good sign because the tank oil temperature has always been remarkably low (except at top end speeds). </p><p></p><p>I was thinking that your flywheel must be to slippery for oil to stick to it if you have too much oil in the sump! The sump, being in two parts, carries the oil via the flywheel, or flywheel windage, into the second sump just clear of the flywheel. The oil pools in this second chamber until the scavenge side of the pump sends it up toward the heads on its way to the ufm.</p><p></p><p>I added a drain plug to this second sump, so I could remove the oil in this chamber. I had a situation where I had trouble with the old contaminated oil in this chamber ruining the clean oil. It was a rare situation, but because it was a Comet the drain plug was easy to install. In normal use, I would expect the scavenge pump to drain this chamber very quickly.</p><p></p><p>Personally, I don't worry much about the oil in the sump. I drain it and add a little more if it is low in the tank. The old pumps that are still good let as much oil by as the new pumps, otherwise there would be lots of new oil pumps sticking in their bores.</p><p></p><p>David</p></blockquote><p></p>
[QUOTE="davidd, post: 95360, member: 1177"] Tommy, It is a little difficult for me to answer because it is a racing bike that is being tested. 250ml does not sound excessive. I used to run the oil for two meets, but there is so much metal in it I went to changing it every meet. I would have some oil in the sump when I did not change it every meet. David Tompkins first alerted me to the lower viscosity issue and I was reminded by Martyn that Mr. Irving seemed inclined to lower viscosity oils. We have been testing lower viscosity oils that have incredibly high wear resistance (best for flat tappets). Interestingly, there are no high ZDDP oils that test well enough to get high marks in the high film strength tests (none in the top ten, I believe). The oils that are being tested are in the 5W30 range. So far the oil has shown higher temps in the UFM than the higher viscosity oils. To me, this a good sign because the tank oil temperature has always been remarkably low (except at top end speeds). I was thinking that your flywheel must be to slippery for oil to stick to it if you have too much oil in the sump! The sump, being in two parts, carries the oil via the flywheel, or flywheel windage, into the second sump just clear of the flywheel. The oil pools in this second chamber until the scavenge side of the pump sends it up toward the heads on its way to the ufm. I added a drain plug to this second sump, so I could remove the oil in this chamber. I had a situation where I had trouble with the old contaminated oil in this chamber ruining the clean oil. It was a rare situation, but because it was a Comet the drain plug was easy to install. In normal use, I would expect the scavenge pump to drain this chamber very quickly. Personally, I don't worry much about the oil in the sump. I drain it and add a little more if it is low in the tank. The old pumps that are still good let as much oil by as the new pumps, otherwise there would be lots of new oil pumps sticking in their bores. David [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Oil Viscosity
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