Viscosity Study
- Thread starter OldCowboy
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great post-thanks OC
Thanks Old, it's nice to see science and physical testing on here rather than speculation.
This place is full of arm chair mechanics.
This place is full of arm chair mechanics.
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Originally Posted By: Jeff_in_VABch
Thanks Old, it's nice to see science and physical testing on here rather than speculation.
This place is full of arm chair mechanics.
Very true sir!
Based on the recent thread where all the "data" is coming from the Widman Visc calc, it would be nice to see M1 10w30, 5w30 and 0w30 run through THIS test to see how that compares (or doesn't).
Thanks Old, it's nice to see science and physical testing on here rather than speculation.
This place is full of arm chair mechanics.
Very true sir!
Based on the recent thread where all the "data" is coming from the Widman Visc calc, it would be nice to see M1 10w30, 5w30 and 0w30 run through THIS test to see how that compares (or doesn't).
Originally Posted By: SubLGT
Do all three of these oils have identical density?
go ahead--get technical on us
Do all three of these oils have identical density?
go ahead--get technical on us
Originally Posted By: SubLGT
Do all three of these oils have identical density?
The 0W40 density was 0.85; the 10W40 was 0.860; and the 5W20 was 0.852.
Should I be making a correction for density? If so, how?
Do all three of these oils have identical density?
The 0W40 density was 0.85; the 10W40 was 0.860; and the 5W20 was 0.852.
Should I be making a correction for density? If so, how?
I have done some research into the Saybolt viscometer, and found that it is similar in principle to the dishwasher detergent bottle viscometer you came up with. Here is a link to a page that shows a diagram:
http://www.tpub.com/content/engine/14105/css/14105_36.htm
This page also gives the equations required to convert Saybolt Universal Seconds to centistokes. If you assume that your viscometer is analogous to the Saybolt, you could calculate the viscosities demonstrated in your tests and see how they compare to PDS values.
For times between 32 and 100 seconds, viscosity is calculated by:
KV = .226 x t - (195/t)
For times over 100 seconds, viscosity is calculated by:
KV = .220 x t - (135/t)
Judging from the flow time you got for water, it seems like your viscometer behaves similarly to the Saybolt. Water has a KV of ~1 centistoke, and 1 cS converts to 31 Saybolt seconds. You got 29 seconds in your test, so based on that one reading, it's not far off.
If you did tests at 100F, you could compare your measured KV's to those that are published on the PDS's.
http://www.tpub.com/content/engine/14105/css/14105_36.htm
This page also gives the equations required to convert Saybolt Universal Seconds to centistokes. If you assume that your viscometer is analogous to the Saybolt, you could calculate the viscosities demonstrated in your tests and see how they compare to PDS values.
For times between 32 and 100 seconds, viscosity is calculated by:
KV = .226 x t - (195/t)
For times over 100 seconds, viscosity is calculated by:
KV = .220 x t - (135/t)
Judging from the flow time you got for water, it seems like your viscometer behaves similarly to the Saybolt. Water has a KV of ~1 centistoke, and 1 cS converts to 31 Saybolt seconds. You got 29 seconds in your test, so based on that one reading, it's not far off.
If you did tests at 100F, you could compare your measured KV's to those that are published on the PDS's.
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Wow, thanks for the info. Looks like if I adjust my lines, I could easily get to 31 seconds. And with the temps we've been having lately, 100*F should be achievable at about 3 pm every day.
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