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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: 92484" data-attributes="member: 1177"><p>I do agree with the "forever" problem. However, I am not certain that ZDDP is an important ingredient. If you find oil film tests designed to test the film strength of oil for the purpose of using the oil in older flat tappet engines the high ZDDP oils do no do so well as one would think. I noted that Valvoline VR1 came in 46th place on film strength in a film strength test. I think the oil is still quite good and I would not jump ship. It is just that the cam to follower film strength merely "outstanding" instead of "incredible." And, I suppose that is the point. These differences often don't mean a lot in every day riding.</p><p></p><p></p><p></p><p>I always love to see Mr. Irving's advice. I do think if he were with us today he would think the multigrades were not just fine, but preferable. Multigrades today tend to provide the highest film strength and wear protection while flowing at a much higher rate, which means better cooling. </p><p></p><p>You do have to watch your thinking. If you take 5W20, 5W30 and 5W40 they are respectively 5.8, 5.9 and 6.2 times thicker than cold even though they are all the same "5". So, the number after the "W" also matters in determining how thick the cold oil is. </p><p></p><p>Assuming Phil is correct about the viscosity I would note that straight 30 is much thicker than 0W30, 5W30 amd 10W30 when cold. This means poor oiling on start up as well as reduced flow with the straight 30.</p><p></p><p>I think most owners carry too much oil in the oil tanks. Fill them up to the top when you head out for a rally.</p><p></p><p>I don't think you should drive yourself crazy with this. If you're having good luck keep doing what you are doing. I think experimenting with some of the thinner oils with incredible film strength might be worthwhile for someone like Greg who is tuning a Vincent in as many ways as he can figure. It is certainly nice to get a bike to kick start on the first kick!</p><p></p><p>David</p></blockquote><p></p>
[QUOTE="davidd, post: 92484, member: 1177"] I do agree with the "forever" problem. However, I am not certain that ZDDP is an important ingredient. If you find oil film tests designed to test the film strength of oil for the purpose of using the oil in older flat tappet engines the high ZDDP oils do no do so well as one would think. I noted that Valvoline VR1 came in 46th place on film strength in a film strength test. I think the oil is still quite good and I would not jump ship. It is just that the cam to follower film strength merely "outstanding" instead of "incredible." And, I suppose that is the point. These differences often don't mean a lot in every day riding. I always love to see Mr. Irving's advice. I do think if he were with us today he would think the multigrades were not just fine, but preferable. Multigrades today tend to provide the highest film strength and wear protection while flowing at a much higher rate, which means better cooling. You do have to watch your thinking. If you take 5W20, 5W30 and 5W40 they are respectively 5.8, 5.9 and 6.2 times thicker than cold even though they are all the same "5". So, the number after the "W" also matters in determining how thick the cold oil is. Assuming Phil is correct about the viscosity I would note that straight 30 is much thicker than 0W30, 5W30 amd 10W30 when cold. This means poor oiling on start up as well as reduced flow with the straight 30. I think most owners carry too much oil in the oil tanks. Fill them up to the top when you head out for a rally. I don't think you should drive yourself crazy with this. If you're having good luck keep doing what you are doing. I think experimenting with some of the thinner oils with incredible film strength might be worthwhile for someone like Greg who is tuning a Vincent in as many ways as he can figure. It is certainly nice to get a bike to kick start on the first kick! David [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Oil Viscosity
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