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Old 07-23-2002, 06:39   #1 (permalink)
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Oils 2 - a bit more advanced

Comments invited below:
Cheers
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Old 07-23-2002, 16:46   #2 (permalink)
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Not to take away from this very useful info that you have presented, but I'm sure I downloaded a free e-book intro on oils that had this very info in it. Maybe a link to the info will help others that want this data on hand? I think this was it?:

http://www.motor-oil-bible.com/

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Old 07-23-2002, 16:50   #3 (permalink)
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AP's quiz:
"What is the study of, or field related to, lubrication called?"
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Old 07-23-2002, 18:49   #4 (permalink)
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Elastohydrodynamometry (well, one branch of it is anyway!)

Otherwise, Tribology (which includes lube, friction & wear - which interestingly includes the study of techniques such as the triboelectric effect - how GladWrap sticks!)

Ummm... can't think of any others - slipometry? ;-)

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Old 07-23-2002, 18:54   #5 (permalink)
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Quote:
Originally posted by jr_4226
Not to take away from this very useful info that you have presented, but I'm sure I downloaded a free e-book intro on oils that had this very info in it. Maybe a link to the info will help others that want this data on hand? I think this was it?:

http://www.motor-oil-bible.com/

Jase.
Thanks for the link Jase - apart from being a little US centric it is both informative as well as easy to read and provides a bit more of the technical detail for those who want to learn more.

PS: Having reread this I do hope you are not suggesting that the e-book has been plagiarised? You will note that sources are credited when I make use of them (as in the SAE sourced comparative table).
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Old 07-23-2002, 19:36   #6 (permalink)
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No! Not at all! I just remember reading this e-book a while ago that had *similiar* information in it which is easier to have on hand, then searching through a forum for the info (thats what I meant by my comment "... on oils that had this very info in it.", not to suggest that you had copied it)

My apologies for any misinterpretations of my previous post - that wasn't my intention at all!

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Old 07-23-2002, 20:34   #7 (permalink)
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Tribology was correct.
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Old 07-23-2002, 20:45   #8 (permalink)
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Woohoo! What do I win... your car? :-)

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Old 07-28-2002, 03:49   #9 (permalink)
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Thanks for the read Russ.
Just changed the oil in the XR after 10,000K.
The oil was stuffed.
Completly black and felt like it had no slip properties at all.
Engine was ticking and the fuel economy worsened.
So I wonder if Ford are going to honour a heap of warranty claims when our engines die with thier recomended 15,000K service intervals. (on AU models)
If they are recomending 15,000K service intervals, they should also recomend synthetic oils.

So like Russ mentioned, change your oil every 5-8,000 K, its worth the $25 for a peice of mind.
I know I will be.

Steve.
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Old 07-28-2002, 07:41   #10 (permalink)
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Re: Oils 2 - a bit more advanced

Quote:
Originally posted by russellw
Basically the average paper element type filter will filter particles in the 40 micron bracket with 85% efficiency and this simply isn't good enough. Extensive studies in the UK have proven that engine wear can be halved by the use of oil filters that offer 98% efficiency at 20 microns. Before everyone rushes out to buy 20 micron filters (and there are some on the market) it is important to understand that filtration efficiency is only one part of the equation. The other two factors that need to be taken into account are the filters capacity for holding contaminants (which will determine when it needs to be changed) and its ability to flow sufficient quantities of oil to meet the lubrication needs of the engine. I won't go into the specifics of it (it would take pages) but suffice it to say that there are a number of high performance oil filters on the market from manufacturers such as Framm and Purolater. These are typically 98.5% efficient at 15 microns (Framm) and are a combination of synthetic and cellulose fibres.
Another thing to consider, though, is that the finer the element, the higher the resistance it gives to the flow of oil. Even though it might give 98% @ 15 microns, it might also impede oil flow to a rate that could seriously harm the engine. IE if the pump provides oil pressure at say 40 PSI, and the 'performance' oil filter takes say 35 PSI to enable the oil to flow, there will only be 5 PSI in the actual oil galleries. What you need is a balance of the two. A filter that provides high filtration, but low pressure resistance...
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