Air filter testing and comparison-getting rid of my K&N

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Air filter testing and comparison-getting rid of my K&N

Postby SunWizard » Wed Mar 05, 2008 3:44 pm

I found an interesting site where some Chevy duramax owners tested a wide variety of air filters against each other using very good methods.

After reading this, I am going to get rid of the K&N reusable filter that came on my truck:
Compared to the stock paper filter, the K&N “plugged up” nearly 3 times faster, passed 18 times more dirt and captured 37% less dirt.
YVORMV - Your veg. oil results may vary.
95 Dodge Cummins 4x4 SVO WVO conversion.
81 Mercedes 300D- stock and happy on V80/D20 blend.
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Why I use K&N

Postby John Galt » Wed Mar 05, 2008 4:46 pm

The study shows how a fresh K&N filter does not remove as much as a fresh paper filter. If I was heading into dusty conditions I wouldn't use a fresh clean K&N. I have a throw-away paper filter I use for dusty conditions and a cleanable K&N which I use throughout the winter with snow on the ground, and into the summer for normal highway driving. A 'dirty' K&N filters like a paper filter and works for most of my driving conditions. I get the oil analyzed at every change, and there is no abnormal silicon which would indicate an inadequate air filter.
Last edited by John Galt on Wed Mar 05, 2008 10:36 pm, edited 1 time in total.
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Postby SunWizard » Wed Mar 05, 2008 5:08 pm

They go through a whole dirt loading cycle, from new until plugged, and the 18x more dirt passed through was over that cycle not just at the start. They show the filter effectiveness (restriction) as it gets loaded with dirt, not just when new. They show the K&N filter restriction stays very low (passing a lot) until just before plugging up, then the restriction increases exponentially. A linear increase in restriction is better they say.

Its good that your oil analysis is OK. I still think replacing my filter every 10-15k is a small price to pay now that I saw that test.
YVORMV - Your veg. oil results may vary.
95 Dodge Cummins 4x4 SVO WVO conversion.
81 Mercedes 300D- stock and happy on V80/D20 blend.
Low fossil net zero house- 100% solar power and heat.
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Postby WyoSam » Wed Mar 05, 2008 10:05 pm

I read the same study a few months ago, what a let down when I thought I was doing the best for my truck with the K&N. I drive a lot, especially in the fall, on some really dusty roads. I switched to a WIX filter at my last oil change.

I'm really going to be zipped when someone does some good research that shows Amsoil doesn't work as well as the used motor oil left the corner of some guys garage for the last three years <g>.

Sam
Wyoming
Vegistroke V3
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Postby Muleears » Fri Mar 07, 2008 9:27 am

[quote="

I'm really going to be zipped when someone does some good research that shows Amsoil doesn't work as well as the used motor oil left the corner of some guys garage for the last three years <g>.

Sam
Wyoming[/quote]

I'm with you Sam, I just spent $102 on Amsoil for my cars next few changes.
Cal Genereux
Southeast VA
98 E300D, two tanked, Greasecar
87 300D Turbo, Blend
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Postby Jake Palmer » Fri Mar 07, 2008 9:42 am

Muleears wrote:I'm with you Sam, I just spent $102 on Amsoil for my cars next few changes.


holy shmoly... that's grownup money.

I'm thinking about a bypass filter on the e300d
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Bypass filter thoughts

Postby HoldOnTight » Fri Mar 07, 2008 10:03 pm

I have a bypass filter, along with a K&N. The bypass filter helps keep the oil cleaner, and I hope erases the sins of the K&N. I understand that the VO can cause polymerization of the motor oil, so a little extra protection doesn't hurt. I still change the oil a bit on the early side, because I can afford to with all that VO I'm burnin! :)

With VO, I believe it is very important to have good air flow. That means more fuel is burnt and not polymerizing. So, I think the K&N does have it's value. Thoughts?
Late 99 Ford F-250, Designed and installed at home, 30 kMi on VO. WVO temp at solenoid valve is 185-195+F, winter-summer.
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Postby SunWizard » Fri Mar 07, 2008 10:14 pm

Good air flow is important running on diesel as well. Diesel engines flow a lot of air. My Dodge truck has a nice visual restriction indicator right on top of the filter that shows and remembers the highest level of vacuum, so I know if its ever restricted enough to decrease performance.

The bypass filter won't help much with one sin of the dust particles= increased cylinder and ring wear.
YVORMV - Your veg. oil results may vary.
95 Dodge Cummins 4x4 SVO WVO conversion.
81 Mercedes 300D- stock and happy on V80/D20 blend.
Low fossil net zero house- 100% solar power and heat.
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Postby David » Sat Mar 08, 2008 4:25 am

I have always believed in paper filters as giving the best air cleaning performance. I had a carburettored performance V8 years ago and used to silicone 2 of the standard round elements together and srick the air clearer lid on top with the help of a piece of longer Rod. Car went great, filters were cheap and I was always comfortable I was putting clean air in my engine. Not many cars these days have that kind of under bonnet room but a friend modified a huge 4WD filter to fit his 4cyl which gives him heaps of airflow with a filter that cleans well is relatively cheap and available anywhere.

As for expensive oil, I believe any cheap oil of the correct grade, even the supermarket variety, will probably be just as good for an engine if changed twice as often with the filter as using the expensive stuff for the full service interval.

I also wonder how much of the wear that occurs in an engine is directly attributed to oil used and how much is more to do with things like driving style and conditions which the vehicle is operated under.
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Postby andrewh » Fri Apr 04, 2008 11:47 pm

I am running a conical oiled-cotton air filter on my '93 Chev. 6.5t. It's not a K&N but a similiar generic I bought from SSdiesel. Are there any paper replacements for this type conical filter? Thanks for the help.
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Postby hheynow » Sat Apr 05, 2008 9:12 am

As far as the 1st generation Powerstrokes, many toss the stock air box & filter and get a Donaldson air filter sold as a Tymar. Great air flow and no dust/dirt gets past the filter. Many with a K&N complain that they don't seal very well and re-oiling it is a tedious chore to get it right.

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