Air filter test info

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Air filter test info

Postby Jasen [OP] » April 21st 2013, 4:47am

found this on another forum and thought is was worth posting.

The following article I found at http://forum.thedieselpage.com/ubb/ulti ... 3;t=007856 confirms my suspicion.

Using a K&N filter won't hardly add any power and will only make your engine wear out faster. According to the article below, the K&N passed 15 times more dirt into the engine than the AC Delco. BUYER BEWARE!!

Here's the article:

On another diesel forum the members banded together to conduct an independent study regarding air filters for the Duramax Diesel. There is a lot of marketing hype surrounding certain aftermarket air filters and we wanted to know if the filters could stand up to their claims. Claims of "superior" filtering ability and dirt holding capacity are among some of these claims. Additionally, many filters are claimed to allow for "better" air flow giving you more horsepower.

This claim of better flow giving more horsepower is a debate all its own, but dyno tests run with a paper filter vs. NO FILTER AT ALL have shown NO INCREASE IN POWER OUTPUT. Therefore a filter with "better flow" will not only give you no increase in performance, it will also let in a lot of dirt while doing it.

The following data is provided by Testand Corp. in Rhode Island. Testand makes the $285,000 machines that perform the SAE J726/ISO 5011 air filter test standard. Any air filter that wants to be tested for performance and efficiency uses this test. These tests cost $1,700 per filter when done by an independent laboratory. Testand Corp. was interested in the comparison study and agreed to do the study for us.

Every filter listed was tested in an identical manner according to the SAE/ISO test standard> Here are the results:


In the order of EFFICIENCY (ability to filter dirt) the results are as follows:

FILTER % EFFICIENCY

AC Delco OE 99.93%
Baldwin paper 99.72%
No name pargain paper 99.32%
AFE Pro Guard 7 panel filter 99.23%
WIX/Napa Gold 99.03%
Purolator paper 98.73%
Amsoil, new style 98.63%
UNI 97.93%
K&N 96.80%


FLOW RESTRICTION from best to worst. Remember, 27.7 inches of water = 1 psi. So, 1 inch of water = .036 psi. The worst (AC Delco) at 6.23 in. water and the best (K&N) at 4.54 in. water is a difference of 1.69 in. of water or a "whopping" .0608 psi. Virtually negligible.

In order from least restricive to most:

FILTER RESTRICTION in inches of water

K&N 4.54
Mystery bargain 4.78
AFE Pro Guard 4.99
Purolator 5.05
WIX/Napa Gold 5.06
UNI 5.40
Baldwin 5.71
Amsoil 5.88
AC Delco 6.23


DIRT HOLDING CAPACITY. From best to worst. This is the AMOUNT of test dirt it took to create an ADDITIONAL 10 inches of restriction. At that point the test is terminated. This is an indication of HOW LONG a filter is good before it must be cleaned or replaced.

FILTER Dirt Holding Capacity

AC Delco 573.898 grams
WIX/Napa Gold 447.366 g
Purolator 388.659 g
Baldwin 388.154 g
UNI 374.638 g
Mystery bargain 350.402 g
AFE Pro Guard 7 232.516 g
K&N 211.580 g
Amsoil 196.323 g


TOTAL DIRT PASSING THE FILTER DURING THE TEST. This is how much dirt your engine will take in if you use the filter for the duration that would cause the filter to become "dirty" enough to need replacement or cleaning. The "Dirt Passing The Filter" is the dirt collected by the "POST FILTER" during the SAE/ISO test.

In order from best to worst, the filters performed as follows:

FILTER DIRT IN GRAMS PASSED

AC Delco 0.4g
Baldwin 1.1g
AFE Pro Guard 7 1.8g
Mystery bargain 2.4g
Amsoil 2.7g
WIX/Napa Gold 4.4g
Purolator 5.0g
K&N 6.0g
UNI 7.9g

NOTE: During the test the Purolator was reported to have had a seal failure which gave it higher than expected dirt passing.
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Air filter test info

Postby thegreenmachine » April 21st 2013, 11:05pm

I've seen this before. I still think its a
Delco biased test. I have a k&n I've found it's way better than the OE replacment
"that looks legit"

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Re: Air filter test info

Postby Jasen [OP] » April 21st 2013, 11:16pm

this was the only info i could find on both air flow and filtration. found it on a caddi forum
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Re: Air filter test info

Postby SilverBullet1997 » April 21st 2013, 11:52pm

I put a cheap fram in mine. :D
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Re: Air filter test info

Postby detailer4u » April 22nd 2013, 12:13am

That's a good and very interesting post. I've considered switching to a K&N but with anything, I'm always cautious when using something or a part that was not part of the original design. Same reason I'm a bit skeptical about products that are hyped to "increase your gas milage by up to 30%" or similar. Sure, they may work but what is the long term or collateral effects of using such a product. It may work but I'm not willing to take a risk and make my engine or a part or component wear out prematurely.

GM engineers designed and tested my 4.3LVortec and changing things around too much will put me into untested conditions and nobody knows what the ture results will be in the long term. I'm happy how it works as designed and hey, I'm getting 21.9 mpg from mine - I can't complain about milage for such an engine. If I want a 30% increase in gas milage, I'll drive my wife's Malibu!! LOL
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Re: Air filter test info

Postby markmitch » April 22nd 2013, 12:20am

I have been using K&N filters for many years never had a problem. When I used to do a lot of mudding and climbing in my younger days the K&N was the best thing going cause of the oil in the filter it kept much water and mud out of the carb.
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Re: Air filter test info

Postby SilverBullet1997 » April 22nd 2013, 12:29am

almost every 4wheeler uses a K&N filter. They must work good.
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Re: Air filter test info

Postby chevymaher » April 22nd 2013, 1:06am

SilverBullet1997 wrote:almost every 4wheeler uses a K&N filter. They must work good.

They use them because of the mud. Easier to wash out. Paper element gets wet it stops running. Paper stopping the water and mud. K&N just keeping the rocks and big stuff out. Sucks down the water and mud and keeps running.
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Re: Air filter test info

Postby Jasen [OP] » April 22nd 2013, 6:18am

the wranglers had a k&n for 12-13 years, ran one in my old 85 toyota p/u for 10 years. i think it helped the toyota along with the air box mod i did to it, but i don't think it makes any difference in the jeep. these day's my only concern with filters is that they filter good. k&n has been around for a long time and if it wasn't doing a good job, there wouldn't be so many of them under the hoods these day's imo.
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Re: Air filter test info

Postby Corsemoto » April 22nd 2013, 7:17am

Most powersports vehicles use either paper or oiled foam filter elements stock. I also don't know many that endure the same kind of mileage as street vehicles so that is not a good comparison. What's okay for your four wheeler or dirt bike may not be suitable for a street car/van/truck.

A K&N can get saturated as well which is why they also sell filter precharger and drycharger wraps for very dusty or wet conditions, so they are not exactly immune from the elements either. One issue is that people tend to over oil any kind of gauze or foam filter element, negating any possible benefit.

Bobistheoilguy.com is a wealth of information if you really want to weed through tons of information.
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Re: Air filter test info

Postby SilverBullet1997 » April 23rd 2013, 5:23am

Corsemoto wrote:Most powersports vehicles use either paper or oiled foam filter elements stock. I also don't know many that endure the same kind of mileage as street vehicles so that is not a good comparison. What's okay for your four wheeler or dirt bike may not be suitable for a street car/van/truck.

A K&N can get saturated as well which is why they also sell filter precharger and drycharger wraps for very dusty or wet conditions, so they are not exactly immune from the elements either. One issue is that people tend to over oil any kind of gauze or foam filter element, negating any possible benefit.

Bobistheoilguy.com is a wealth of information if you really want to weed through tons of information.


When I said 4wheeler, I was referring to 4x4 Trucks, Suvs, and jeeps, and ASTROS! YAY!

Sorry if I was being confusing
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Re: Air filter test info

Postby Corsemoto » April 23rd 2013, 5:43am

Gotcha, I think it's just one of those obligatory things some people do, like a "cai" or cold air intake kit which can really be a misnomer since in many designs they will actually draw warmer air from engine compartment.

I do use gauze and foam type filter elements on motorcycles, although any gains seen are usually accompanied by doing other work in conjunction with filter change - exhaust, fueling changes, larger air ducts, airbox modification, etc.

I had a K&N back in the day on my old van but I stick with paper filters for this one - usually Wix or Mann if I remember to order one from Rock Auto with other items, or a Purolator if I have to pick one up at the laps.
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