Oil weight.?
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Tourer
Joined: Feb 2010
Posts: 437
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From: CENTRAL VERMONT
Oil weight.?
- Does any body know the weight of the HD/screaming eagle heavy fork oil, & is that a good upgrade from the stock oil.? My buddy with a streetglide says I want 7.5 weight.....I dont realy know.!
Club Member
Joined: Feb 2008
Posts: 11,483
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From: Passaic County, NJ
Less than one minute using google, I found this:
Type "E" is 5 weight - the lightest one
Type "B" is 10 weight
Type "screamin' eagle" is 15 weight
Type "screamin' eagle racing oil" is 20 weight ( Not intended for street bikes)
Type "E" is 5 weight - the lightest one
Type "B" is 10 weight
Type "screamin' eagle" is 15 weight
Type "screamin' eagle racing oil" is 20 weight ( Not intended for street bikes)
Road Warrior
Joined: Apr 2010
Posts: 1,739
Likes: 10
From: Suffolk, England
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.
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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Seasoned HDF Member
Joined: Nov 2010
Posts: 17,547
Likes: 7,153
From: Oxford, Nc
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; May 12, 2012 at 04:10 PM.
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Road Master
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From: Bay Area, NorCal
~
Outstanding HDF Member
Joined: May 2008
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From: la
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.