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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Oil Viscosity
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<blockquote data-quote="greg brillus" data-source="post: 85307" data-attributes="member: 597"><p>I just thought I might mention about different grades of oil and the effects it can have on our engines. After the rebuild of my Rapide last year, and after the first 500 miles I changed the oil and filter. Ordinarily I have mostly used a 20w/50 mineral oil, but this time I opted to use a Penrite 20w/60 that had added Zinc for better protection of the cams and followers, so I gave it a try. Since the rebuild I have noticed that the engine has been more difficult to start, but the main change had in reality been the change of cams, from original Mk 3's to some type of Mk 2, I say that because I have no idea as to their origin, Only that their specs match most other Mk 2 cams giving about 0.385" lift at the valves. With this newer oil I had chosen, I noticed that it is definitely thicker, and it appeared to me that when kicking the engine over that it felt as though it had wet sumped, as I could feel the extra drag as the engine tried to rotate. The only thing was, that if I removed the sump plug that only about 150 Ml's of oil would drain out, so hardly a wet sumping problem. So with the new engine at about 1200 Miles now last Thursday I changed the oil/filter, and used a 15w/40 mineral oil for Diesel engines. Started the engine after I first primed all the oil ways and filter chamber, and on the Saturday the wife and I headed off for a local bike rally where we clocked up about 100 miles or more on the Saturday stopping here and there for a toilet stop and for lunch. I guess over the weekend I must have started the engine 7 or 8 times, and it basically started first kick every time, and I noticed how much easier the engine spun over considerably quicker than with the heavier oil. It is surprising how much extra drag is imparted within all the roller races and to some extent from the piston skirts to the cylinder walls. Before this my level of frustration was climbing rapidly as nothing is more annoying than trying to start an engine on a newly rebuilt bike that you and everyone else around you knows should not be that difficult to start. After last weekend, I could not have been happier with how it started, because when it is running, it really goes very well. Interesting results.............</p></blockquote><p></p>
[QUOTE="greg brillus, post: 85307, member: 597"] I just thought I might mention about different grades of oil and the effects it can have on our engines. After the rebuild of my Rapide last year, and after the first 500 miles I changed the oil and filter. Ordinarily I have mostly used a 20w/50 mineral oil, but this time I opted to use a Penrite 20w/60 that had added Zinc for better protection of the cams and followers, so I gave it a try. Since the rebuild I have noticed that the engine has been more difficult to start, but the main change had in reality been the change of cams, from original Mk 3's to some type of Mk 2, I say that because I have no idea as to their origin, Only that their specs match most other Mk 2 cams giving about 0.385" lift at the valves. With this newer oil I had chosen, I noticed that it is definitely thicker, and it appeared to me that when kicking the engine over that it felt as though it had wet sumped, as I could feel the extra drag as the engine tried to rotate. The only thing was, that if I removed the sump plug that only about 150 Ml's of oil would drain out, so hardly a wet sumping problem. So with the new engine at about 1200 Miles now last Thursday I changed the oil/filter, and used a 15w/40 mineral oil for Diesel engines. Started the engine after I first primed all the oil ways and filter chamber, and on the Saturday the wife and I headed off for a local bike rally where we clocked up about 100 miles or more on the Saturday stopping here and there for a toilet stop and for lunch. I guess over the weekend I must have started the engine 7 or 8 times, and it basically started first kick every time, and I noticed how much easier the engine spun over considerably quicker than with the heavier oil. It is surprising how much extra drag is imparted within all the roller races and to some extent from the piston skirts to the cylinder walls. Before this my level of frustration was climbing rapidly as nothing is more annoying than trying to start an engine on a newly rebuilt bike that you and everyone else around you knows should not be that difficult to start. After last weekend, I could not have been happier with how it started, because when it is running, it really goes very well. Interesting results............. [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Oil Viscosity
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