oil filter link

[R Mangas]

    What you're saying is only partly true-  the belief on that board is
that the finer filtering filters typically have a larger pressure drop
across them, given one particular filter size.  The larger dp is NOT
construed as a good thing; the recurring argument is how to balance
filtration efficiency with adequate flow.  They've got a good start in
supporting this- look at the dp of the Purolator Pure One, typically rated
as a filter that removes fine contaminantes.  Except that this drives the dp
fairly high- 12psi in this test.

   So which is better- removal of fine contaminants, or unrestricted flow?
What these guys are trying to achieve is to find an appropriate balance.  Me
personally, I'd been using an oversize Pure One on my Miata (used for this
example b/c it's got an oil pressure gauge [reading _after_ the filter]) but
on my last change couldn't get one locally so switched to an 'OEM' filter.
Whaddya know?  My OP is up 4-8 PSI, depending on RPM, but presumably now
larger particles are remaining in the lubricant stream.  It's a tough
choice!



>From: Tom Christiansen <tomchr at ee.washington.edu>
>To: quattro at audifans.com
>Subject: Re: oil filter link
>Date: Fri, 04 Apr 2003 11:00:25 -0800
>
>Folks,
>
>>  Here's another, and this one isn't selling anything...
>>
>>http://theoildrop.server101.com/ubb/ultimatebb.php?ubb=get_topic;f=6;t=000513
>
>The author of that site clearly states his hypothesis in the beginning: a
>filter with lower differential pressure is providing a worse filtration
>than a filter with a high differential pressure.
>
>I don't think this hypothesis is true. A good filter will provide
>filtration with the lowest possible differential pressure. Simply put - you
>dump contaminants of different sizes into the oil and thereby measure the
>smallest contaminant the filter can filter out while keeping an eye on the
>differential pressure (pressure drop across the filter). The filter which
>traps the most, smallest particles over its life span, while maintaining a
>low diff pressure wins.
>
>Another way to contest his hypotheses is that a totally clogged up filter
>will have max diff pressure. 40psi in, 0 psi out. Such a filter will get
>the highest score on his system...
>
>
>Tom
>
>


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