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#4679018 - 02/26/18 06:17 PM OEM Style v K&N / 2015 air filter study
wemay Offline


Registered: 04/04/12
Posts: 8885
Loc: Southeast Florida
*PDF FILE*
International Conference on Emerging Trends in Engineering, Science and Technology (ICETEST•2015)

Mathews V Johna,*, Sandhya Ma, Balakrishnan Kaa
Department of Mechanical Engineering, Government Engineering College, Thrissur-680009, Kerala, India

https://www.sciencedirect.com/science/ar...301475-main.pdf
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#4679119 - 02/26/18 07:41 PM Re: OEM Style v K&N / 2015 air filter study [Re: wemay]
BrocLuno Offline


Registered: 09/06/15
Posts: 5518
Loc: Kalifornia Kollective
Don't like the intake whistle that sometimes comes with K&N style systems. I'll take OEM any day smile
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#4679136 - 02/26/18 07:54 PM Re: OEM Style v K&N / 2015 air filter study [Re: wemay]
Trav Offline


Registered: 11/20/06
Posts: 18885
Loc: MA, Mittelfranken.de
They seem to have used mostly diesels with 100% flow of air all the time and even under those conditions the difference in performance was negligible.
Gasoline engines only require full flow at WOT and would not benefit at all from this type of filter as filter size is greater than the engine could consume at WOT.
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#4679203 - 02/26/18 08:49 PM Re: OEM Style v K&N / 2015 air filter study [Re: wemay]
Linctex Offline


Registered: 12/31/16
Posts: 6148
Loc: Waco, TX
"the very high cost of K&N air filter (Rs6500/-) compared to that of the OEM air filter(Rs200/-) is a deterrent"

WOW!!

First, 200 rupees isn't that much ($3 USD)

6500 rupees = $100 !!!!
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#4679228 - 02/26/18 09:02 PM Re: OEM Style v K&N / 2015 air filter study [Re: wemay]
Marco620 Offline


Registered: 02/25/14
Posts: 2186
Loc: Deplorable Kansan,HK fan!
I'd go OE of AEM Dryflow/AFE Dry if its a performance need but never an oiled air filter. If so, pantyhose on the cone or intake plenium for safe measure.
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#4679376 - 02/27/18 04:55 AM Re: OEM Style v K&N / 2015 air filter study [Re: wemay]
SilverFusion2010 Offline


Registered: 06/29/11
Posts: 1658
Loc: Crawfordville FL
Meh. Not impressed with that paper.
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#4679378 - 02/27/18 05:05 AM Re: OEM Style v K&N / 2015 air filter study [Re: wemay]
Dave9 Offline


Registered: 08/28/17
Posts: 176
Loc: Cincinnati, USA
Potentially worthless study, results can only be compared to same engine with same intake and doesn't consider what happens when more and more oil vapor makes its way onto intake sensors, and assumes many things as fact which are not and sometimes even gets things backwards. For example:

Quote:
Fig 8 shows that the filtering efficiency of the OEM filter was superior to that of the K&N filter. The decreased filtering efficiency of the K&N filter can be attributed to the increased pore size of the cotton gauze medium used in the filter. The actual filtering efficiency of the K&N filter will be higher in real life scenario due to the increased
surface area exposed to the air stream.


They aren't even thinking logically if they can't see that having more larger holes does nothing to increase filtering efficiency. Flow efficiency maybe, but not filtering.

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#4680207 - 02/28/18 02:36 AM Re: OEM Style v K&N / 2015 air filter study [Re: wemay]
wemay Offline


Registered: 04/04/12
Posts: 8885
Loc: Southeast Florida
I believe it may be a translation issue. I understand it to mean, initial filtering efficiency is is worse than what you get through daily driving, accumulating miles and thus packing the media.
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#4680224 - 02/28/18 04:44 AM Re: OEM Style v K&N / 2015 air filter study [Re: Dave9]
Ducked Offline


Registered: 10/25/12
Posts: 4366
Loc: Taiwan
Originally Posted By: Dave9
Potentially worthless study, results can only be compared to same engine with same intake and doesn't consider what happens when more and more oil vapor makes its way onto intake sensors, and assumes many things as fact which are not and sometimes even gets things backwards. For example:

Quote:
Fig 8 shows that the filtering efficiency of the OEM filter was superior to that of the K&N filter. The decreased filtering efficiency of the K&N filter can be attributed to the increased pore size of the cotton gauze medium used in the filter. The actual filtering efficiency of the K&N filter will be higher in real life scenario due to the increased
surface area exposed to the air stream.


They aren't even thinking logically if they can't see that having more larger holes does nothing to increase filtering efficiency. Flow efficiency maybe, but not filtering.


It seems to be a speculative assumption.

They tested the filter efficiency (defined as % cement dust retention) on a fixed area of filter material. For a given total amount of air flow (and therefore a given total amount of dust injested) with a bigger total filter area the flow rate across a unit area will be lower.

It seems a fairly reasonable assumption that filtration efficiency will increase as flow rate/unit area goes down, but it is an assumption and it should have been stated as such.

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#4680381 - 02/28/18 08:09 AM Re: OEM Style v K&N / 2015 air filter study [Re: wemay]
Ducked Offline


Registered: 10/25/12
Posts: 4366
Loc: Taiwan
That "filter efficiency" procedure is apparently simple, but I'd think it would be quite difficult to standardise it in such a way as to avoid uncontrolled variables (for example, exactly how you introduce the cement powder to the airstream, over what period, and at what RH) which isn't described other than as "slowly"

I'd expect to see some measure of the variation / reproducability of that result in particlar, but also the other results, and it doesn't seem to be there.

The most accessible paper on this topic is the Oak Ridge study (Norman, Huff and West, 2009)

https://www.fueleconomy.gov/feg/pdfs/Air_Filter_Effects_02_26_2009.pdf

They don't cite that paper as such, but they cite SAE papers that share two of its authors and probably report the same data.

The effects reported in that paper are generally small to negligable, and the filter restriction threasholds were lower as well.

A Tata Sumo is of course a very different vehicle. Perhaps it has a more restricted intake path and an engine more sensitive to restriction.

Nevertheless the difference is a bit surprising, and it isn't really acknowledged in the discussion.

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#4680392 - 02/28/18 08:25 AM Re: OEM Style v K&N / 2015 air filter study [Re: wemay]
Virtus_Probi Offline


Registered: 06/25/15
Posts: 3970
Loc: New England
Might be worth comparing to this series of tests done way back in 2009...

http://www.nicoclub.com/archives/kn-vs-oem-filter.html
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#4680686 - 02/28/18 02:52 PM Re: OEM Style v K&N / 2015 air filter study [Re: wemay]
Yah-Tah-Hey Offline


Registered: 05/26/14
Posts: 3408
Loc: Columbus,Nebraska
Wouldn't have one if they gave it to me. Don't care if ten engineers vouch for that K&N. Won't filter as good as the OEM filter.

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#4680702 - 02/28/18 03:03 PM Re: OEM Style v K&N / 2015 air filter study [Re: Virtus_Probi]
wemay Offline


Registered: 04/04/12
Posts: 8885
Loc: Southeast Florida
Originally Posted By: Virtus_Probi
Might be worth comparing to this series of tests done way back in 2009...
http://www.nicoclub.com/archives/kn-vs-oem-filter.html



Referencing the study you cite, i'm ok with 96.8% efficiency for the K&N. hide




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2013 Hyundai Santa Fe Sport 2.0T
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#4681038 - 02/28/18 09:17 PM Re: OEM Style v K&N / 2015 air filter study [Re: wemay]
Marco620 Offline


Registered: 02/25/14
Posts: 2186
Loc: Deplorable Kansan,HK fan!
AC Delco is 99.9! Wow! Car company is fair at best but I guess they got filtering down pat.
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#4681063 - 02/28/18 09:46 PM Re: OEM Style v K&N / 2015 air filter study [Re: wemay]
Killer223 Offline


Registered: 05/07/15
Posts: 389
Loc: AZ
if you care about the engine, and run it more than a drag track, do not run a K&N. i've seen dozens of dusted engines from a K&N.
https://youtu.be/gNQ6d3ox5Ok

here is a well documented
https://youtu.be/6F5TgPY96V4
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