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#11
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Chain lubrication - gearbox oil
jbuch wrote:
Your chart on viscosity is for *100C* temperature, or boiling water (212F). Oops. Sorry about that. I was unable to easily find the viscosity vs temperature data for the lubricants in question. Nor could I. I can say though, that I have had both 90W gear lube and 10W-30 motor oil in my car's manual transmission (the shop manual calls for the latter), and I could scarcely feel any difference in shifting, cold or warm. Tom Ace |
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#12
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Chain lubrication - gearbox oil
jbuch wrote: Tom Ace wrote: Your chart on viscosity is for *100C* temperature, or boiling water (212F). That's the right side axis. The axis on the left is for 40 degrees C. Still a bit warm, of course - but I've ridden in that temperature. I'm surprised, though, that they can use double axes this way. That implies all the oils have the same change in viscosity with temperature, i.e. the same viscosity index. I'd have thought otherwise. The bicycle chain at cooler temperatures experiences a different lubrication viscosity than given by the charts. I'm not convinced viscosity values have any importance in lubricating a bike chain. They're certainly important in fully hydrodynamic plain bearings (like your car's crankshaft mains) but the pivoting components of a bike chain are entirely different. ISTM all we're trying to do is keep a one-molecule layer of something slippery between metal parts. Anything more than that probably does more harm than good, by collecting and retaining grinding paste. - Frank Krygowski |
#13
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Chain lubrication - gearbox oil
Tom Ace wrote:
jbuch wrote: Your chart on viscosity is for *100C* temperature, or boiling water (212F). Oops. Sorry about that. Actually, the left hand scale listed viscosity for 40C and the right hand side listed viscosity for 100C. Evidently, the relationship between viscosity and temperature is somehow pretty universal, and is built into the chart. I think that a long time ago (20 years) I read something about like that. To a large extent, my old memory seemes to recall that the log(viscosity) vs temperature curves for a variety of different SAE oil weights were parallel. That would be consistent with this left hand and right hand viscosity/temperature scaling being correct. I stopped playing lubrication engineer as soon as my job would let me, and maybe a little sooner. I was unable to easily find the viscosity vs temperature data for the lubricants in question. Nor could I. I can say though, that I have had both 90W gear lube and 10W-30 motor oil in my car's manual transmission (the shop manual calls for the latter), and I could scarcely feel any difference in shifting, cold or warm. Tom Ace I wonder if the story of the different definitions of viscosity grade for gear and automotive .... if the story is interesting and meaningful, or just silly individualism. Jim -- 1) Eat Till SATISFIED, Not STUFFED... Atkins repeated 9 times in the book 2) Exercise: It's Non-Negotiable..... Chapter 22 title, Atkins book 3) Don't Diet Without Supplimental Nutrients... Chapter 23 title, Atkins book 4) A sensible eating plan, and follow it. (Atkins, Self Made or Other) |
#14
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Chain lubrication - gearbox oil
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#15
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Chain lubrication - gearbox oil
Andrew Price wrote:
On Fri, 11 Nov 2005 03:45:39 GMT, Werehatrack wrote: Yes, it works. Most types have an obnoxious odor, however; if your ride must share living quarters with a Significant Other, this may prove to be a problem. Thanks to all who responded. The consensus would appear to be "works, but stinks". I'll think I'll just use ordinary engine oil instead. 1. high detergency is not as favorable in the wet. 2. less adequate e.p. package. |
#16
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Chain lubrication - gearbox oil
search tech archioves for drum roll please!!!!
CHAIN LUBE CHAIN LUBE CHAIN LUBE for temps over 90 go with he tran oil below try straight 50W racing synth dirt collection? pawsibley. anwer there is clean often. also pawsibley-dirt floats better on the higher viscosity giving less wear if frequently cleaned |
#17
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Chain lubrication - gearbox oil
mark wrote:
"Andrew Price" wrote ... Would car gearbox oil (HP 80 or 90) be suitable for chain lubrication, provided the chain is left to soak long enough to enable the oil to work into all the rollers? I can remember being instructed to do just that in Eugene Sloane's book "The Complete Book of Bicycling", ca 1970. Don't know how much dirt it would pick up, but it should lubricate the chain as well as it lubricates a gearbox. It's fine but it attracts dirt and it stinks - particularly the hypoid stuff. |
#18
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Chain lubrication - gearbox oil
For many years I've used gearbox oil as a chain lubricant, and it works
just fine. Since I clean my chains every 300 miles or so the "hardpack" issue isn't a major problem though I spend 15 minutes or so cleaning cogs, chainrings and pulleys. Prior to a year or so ago I'd heat the oil in a large can on an old popcorn popper (hot plate) and let the chain soak in it for several hours. After letting it "drip dry" overnight I'd wipe the chain down with a rag. For the last year or so I've changed my technique. Now, I string the chain horizontally over my workbench (I use SRAM connectors so the chain is stretched its full length) and use an oil can to put a drop or two of gearbox oil on each roller. After it sits overnight I wipe it down. The new technique results in less oil on the parts of the chain that don't really need oil, and less oil sling on other parts of the bike. Lubrication efficacy seems to be the same. Tom Young |
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