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Lubrication and Lubricants You guessed. Here is where everyone can argue over oil.

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  #1  
Old 8th December 2018
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Default Winter reading........

Wish he had tested more 20/50's!


https://540ratblog.wordpress.com/201...-test-ranking/
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Old 9th December 2018
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Winter reading about oil filters

With a little bit of info on flow rate versus pressure from an oil pump.

How to choose an oil filter
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Don't forget the xlforum's Sportsterpedia.
There's enough reading there to keep you busy til riding season.
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Old 9th December 2018
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Quote:
Originally Posted by harley506d View Post
Great read....lots of assumptions, traditions questioned
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Old 12th December 2018
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A little about oil pumps like those used in Sportsters-

A Positive Displacement Pumps is a "constant flow machine"
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Old 31st December 2018
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Here is a good link with some info on diesel engines and oil.
The requirements for motor oil


Might take all day New Years Day to read
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Old 12th January 2019
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Changes in Gasoline Manual 2009 edition-

More information a download link can be found here:

https://ethanolrfa.org/resources/auto-technicians/
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Old 17th January 2019
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Will high efficiency oil filters remove oil additives?

Lubricant additives:What degree are they removed by filtration systems?

The particles trapped from filters can range in size from 40 microns down to the 6-10 micron range.
This latter range is the focus for most filters.

Oil Additives:
A past reference states that defoamer additives are semisolid suspensions in the 5-10 micron range that can be
removed by filtration. This same reference also notes that sulfur and phosphorus EP additives that are not dissolved as
well as suspended antiscuff additives can potentially be removed by efficient 1-micron filters.

Filters:
“Filter selection is highly dependent on the clearance size of the most critical component. Hence, for
systems equipped with servo-valve applications, we would usually employ 3-micron (Beta (3) > 200) filtration efficiencies, whereas for journal bearing applications in gas turbine lubricant systems, we could go as ‘high’ as 20 microns.”

All three filter suppliers have seen no evidence that additives are removed by filters.
silicone defoamers may be the only exception.

The filter primary removal mechanism is pore blockage.
The pores (even the finest ones) are typically on the order of micron sized (10-6 meter), whereas the
dissolved additive molecules are typically on the order of normal molecular size, hence nanometers (10-9 meter) and
are at least three orders of magnitude smaller than the smallest pore.

10 to the 3rd power is 1000, additives sizes are 1000 times smaller than a micron


Lubricant Suppliers:
The lubricant supplier said that additive suppliers indicate using filters down to a 3-micron size in hydraulic fluid
and wind turbine gear oil applications should remove particulates without leading to additive removal. But use of filters below 3 microns can cause problems.
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Old 17th January 2019
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Will a lower micron rated oil filter decrease oil flow?
Will a 5 micron filter have more restriction than a 20 micron filter?

Synthetic oil filter media

Typical differential pressure across an oil filter is about 0.2 psi

With the structure of a synthetic filter medium, the differential pressure of a synthetic filter element is greatly reduced compared to a conventional filter element. This reduces the need to open the bypass valve and sometimes makes it unnecessary altogether.



Significantly lower increase in differential pressure with the use of fully synthetic filter media

(keep in mind that about 14% of the exhaust in an internal combustion engine is water) Getting to 5% water in the oil would not be too hard with many cold starts and short trips (less than about 15-20 miles on a Harley)
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Old 17th January 2019
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That and Condensation from Heating and Cooling of the engine.
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