Interesting info on K&N filters

[Jamie700R]

I removed my airbox and intake and it was filthy all the way to my throttle body. I will never run a K&N filter again on anything i own. They are garbage. Even with an outerware.

[1badazz_700r]

My gytr intake was letting dirt into my intake as well.I had dust on the inside of my intake. I think no matter what filter you run your going to pass some dust through. I also think that sealing around the intake with some silicone may help a little. JMO. I dont think anything is 100% air tight so some dust is going to pass through.I personally have never had a bad experiance with a K&N,and i dont think our raptors are sucking the CFM'S through that a turbo diesel would be either.However im not doubting this test that was conducted,I believe the test was accurate,Im just saying in my area the conditions are differant.

[Jamie700R]

Ive never had a problem with pro design setup w/K&N . I always cleaned it, oiled it and even reached as far into the intake tube as i could and wiped it to see if there was any dirt. So yesterday i decided to take my intake tube off to see if there was any dirt in it. To my surprise it was filthy the butterfly and the opening on the throttle body was caked with black crud. Where i ride it can become really dusty but i thought a K&N with outerwares would filter that. Guess i was wrong. Looks like ill be going to a foam filter. If you ride in dusty conditions and use K&N you might want to take off your intake tube and check. Im glad i did.

And K&N's warranty does not cover offroad use with their filters.
WHAT IS NOT COVERED BY OUR WARRANTY
Any K&N Air Filter used for 1: any type of racing or competition; 2: any off-road use, custom or modified applications; 3: any off-road or dual sport motorcycle/ ATV use; 4: any illegal highway use, marine, or industrial applications. All K&N Air Filters not covered by our million mile warranty are warranted against defective materials or workmanship for one year from date of purchase with no mileage limitation. This includes K&N Air Filters sold for ATV's and off-highway or dual-purpose motorcycles.

And a quote from their testing procedure.
As has become customary in the automotive industry, we use Coarse Test Dust for gasoline engine air filters and Fine Test Dust for diesel engine air filters. This practice of using different grades of test dust developed because Diesel engines require higher levels of filtration because they operate at much higher compression and require finer tolerances than Gasoline engines.

[nikita]

usefull info. THX a lot

[jonesi700r]

k&n's are not recommended for turbo deisels in dust and sand, according to some, they suck soo much air it forces particle through. your raptor will never suck as much air, so you shouldnt have a problem. i thought the same thing about k&n's when i read something simular to that. my cousin is a master tech and he told me its mainly turbo deisels people complain about, but its not that common. I think you should always run a pre-filter anyways, I run one all the time, have never had a problem in 3 years.

[NeverEnough]

Ive had good luck with my K&N. I clean it once every 50 hours or so lol and i ride in decently dusty conditions, and when i did my winter rebuild, The engine had 500 hours on it, and was in really nice condition. the TB had a small amount of dust in it and the piston was clean on top. I would say dont clean them every ride and you should be good.

[Hafbo]

Im currently running a UNI filter on my Raptor 700.
What do you guys think of this filter?
I allways used a Pro Design air filter and was very happy with it.

[Krandall]

Im currently running a UNI filter on my Raptor 700.
What do you guys think of this filter?
I allways used a Pro Design air filter and was very happy with it.

Depending on the conditions I run my uni filter. I love it. Is yours the 2 stage one? (2 foam pieces. One inside of the other)

I run that one in the summer when its super dusty out as foam traps dirt better than the k&n.

[francky2000]

I leave in sandy and dusty area and when using the K&N i use to find dust in the throttle body. Since i am using twin air filters the intake remains clean. only one problem it really affect the performance. So i need to find a big twin air filter to can install it on my trinity intake...

[Colorado700R]

Francky,are you still running an airbox?  if so try the EHS lid with the K&N set-up, or you can cut your airbox and it helps the dust swirl out of there without going to and thru the filter

[francky2000]

I was running the stock air box. I will look into this ehs thing. I really need to get more ponnies for my race. I have one year to get the rappy ready so i am gonna try a lot of things.

[Colorado700R]

This is what I did, and I find I have less dust now, than when running the box with just the lid off 

http://www.raptorsource.com/forum/index.php?topic=3390.0

[Kenny]

Check this out....There is a direct correlation between amount of dirt passed vs overall airflow on filters of a similar size, but different materials. The one standout seems to be synthetic nanofiber, but finding something for the Raptor is tough at the moment. Colorado700R's dust shield is a good idea, and other tricks, such as  an oversize outerwear with a home built internal support to hold it off the main filter.
http://www.bobistheoilguy.com/index.php?option=com_content&view=article&id=66&Itemid=76

[Krandall]

So basically.. for more power/flow. You're risking longevity of the motor..

[Kenny]

So basically.. for more power/flow. You're risking longevity of the motor..

Kinda. Everything is a compromise in stock form. You can spend some time engineering a first class setup and get the power without a real compromise in longevity. It can be painful, but it can also pay off in spades