Oil weight.?
#1
#4
A couple of years ago I was frustrated with Harley for not publishing the viscosity of their fork oils on the product or in the literature. So I sent them an email asking for clarification. After weeks I got a reply saying they don't do it because its more complicated that stating a single 'weight'. That their oil performs differently under different conditions and also that its best to stick to the stock oil.
Not too helpful seeing as every other fork oil maker manages to give a number that is helpful for comparison. So since then I have used BelRay fork oil, which is expensive but at least you know what you are getting. For my Fat Bob I have 15W and that feels just right.
Be wary of using too heavy oil as it tends to make the front end skittish and the handling weird.
#5
#7
The answer to this question seems to be a better kept secret that the Col. Sanders recipe. I asked this question on here quite some time ago, and although there is lots of good info in the thread, it never got answered definitively.
https://www.hdforums.com/forum/frame...fferences.html
https://www.hdforums.com/forum/frame...fferences.html
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#8
Well actually, Foxster's correct.
You can use the "15" wt name to indicate a heavier oil than a "10 wt." and a "5 wt." and so on. So a "15" flows more readily than a "20." ( You could also use #5,4,3,2, and 1, Or Extra Heavy, Heavy, Medium and Light nomenclature.)
How fork oil flows relative to another oil at a given temperature is more to the point.
The Screamin' Eagle flows in the "15/Heavy" category.
There are fork oil flow charts on Google showing the rate of flow at 40*C vs 100*C to give a relative "weight" as compared to other available oils.
You can use the "15" wt name to indicate a heavier oil than a "10 wt." and a "5 wt." and so on. So a "15" flows more readily than a "20." ( You could also use #5,4,3,2, and 1, Or Extra Heavy, Heavy, Medium and Light nomenclature.)
How fork oil flows relative to another oil at a given temperature is more to the point.
The Screamin' Eagle flows in the "15/Heavy" category.
There are fork oil flow charts on Google showing the rate of flow at 40*C vs 100*C to give a relative "weight" as compared to other available oils.
Last edited by Stiggy; 05-12-2012 at 04:10 PM.
#9
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#10
https://www.amsoil.com/storefront/stm.aspx This with a set of Progressive springs took the dive out of my Fatbob, it's nice and firm now.