Open Element air filters

goodburbon

goodburbon

NAXJA Forum User
Location
Westcliffe Colorado.
Just FYI they're crap.

I'm going to be doing away with my K&N filter shortly and possibly switching to a ford or rover cannister filter assy. I have been running a K&N on my fourwheeler since the warranty was up, and now the rings are gone. that makes 2 bikes that I have that needed premature ring jobs running K&N brand filters kept clean and oiled. The K&N style filter just does not protect the engine, power and mileage gains are negligible. From the looks of my intake tubes on my bikes you'd dojust as well to run a piece of porch screenl. At this point it is no longer worth it to me to continue to ruin engines with a filter that just doesn't.

Oh, and my jeep has just developed a stuck lifter as of yesterday. It may be too late for one of my xj's, but those of you out there that still have good engines I reccomend something with a little finer filtration.

just my .02
 
Depends on their definition of "fine dust". Because they're only claiming to be 2% more efficient than the dirty K&N I would have to see the test parameters..

The "fine dust" that my wifes bike and my bike were run in is apparently finer than their test dust. There was sediment 1/2 inch deep in my wifes intake tube downstream of the filter before the carbeurator, the blow by from her worn rings made a very very fine oil based mud. My bike has only just begun to do this but the smoke went from a little at high RPM's to intolerable within 4 hours.
 
Tahts the reason they sell the prefilters or you steal your wifes nylons. I know the foam prefilters help out alot. But a cotton gauze filter will only filter so much and so fine. Ive had good luck with uni filters.
 
olympic4x4tech said:
Tahts the reason they sell the prefilters or you steal your wifes nylons. I know the foam prefilters help out alot. But a cotton gauze filter will only filter so much and so fine. Ive had good luck with uni filters.
Click to expand...

The prefilters block bigger stuff than the cotton, not smaller. I've ran K&N's with outerwears on my powerstroke and wifes 400ex - NEVER AGAIN, they all let dirt through (both had outerwears the entire time).
 
Air filters are pretty straight forward...they filter air...the things that matter are the arrestance (how small a particle they can trap) and the airflow capacity at a particular velocity and pressure drop. This has to do with the effective area (a percentage of open space that air can pass through compared to the surface area of the filter)...the only way to increase the effective area (if the total available space for the filter is defined, such as the filter housing) is to "open up" the spaces that the air passes through.

Pleated paper filter...tiny little spaces between the filiments (most very fine particles are trapped)...Oiled gause or open cell foam...comparatively huge spaces...(alligators and logs get trapped). Yes they flow more air at a given pressure drop and air velocity when thay are clean...but the most damaging stuff gets through...as a bizarre side note...the dirtier a filter gets, the better it filters..up to the point where it "unloads" either because the media fails, or the pressure drop gets so high it literaly sucks the garbage through..this can and will happen to any filter.

Oiled gause filters have their place...in RACE ENGINES that are not expected to offer long term reliability...if you want to see SERIOUS air filtration...look at a piece of heavy duty equipment such as a semi truck or a road grader, etc, etc...they use up to 4 stages of filtration to keep the crud out.

I REALLY like the idea of the oversize canister filter...beats the hell outta the weenie little flat pad stocker. An will do a good filtration job.
 
Alright, now you guys got me worrying about my K&N air filter, so does anybody have any good suggestions. I saw Gojeep's write up (http://go.jeep-xj.info/HowtoAirFilter.htm), but I was looking for something a little more practical. I guess I'm looking for an air filter that I can buy at my local auto parts store and maybe something a little smaller. Should I just switch back to the stock air box for the time being? Thanks in advance.
 
joecool said:
Alright, now you guys got me worrying about my K&N air filter, so does anybody have any good suggestions. I saw Gojeep's write up (http://go.jeep-xj.info/HowtoAirFilter.htm), but I was looking for something a little more practical. I guess I'm looking for an air filter that I can buy at my local auto parts store and maybe something a little smaller. Should I just switch back to the stock air box for the time being? Thanks in advance.
Click to expand...


I tried to read Gojeep's link but my steam powered computer tells me that the site is not around.. I want to read more before I get upset. luckily it rained all spring out here in the West and there hasn't been any dust...
 
http://go.jeep-xj.info/HowtoAirFilter.htm

there's an extra ")" on the end. Works fine otherwise.

When I bought my K&N at 80k miles, I told myself that it probably wouldn't hurt as these engines are bulletproof anyway, and if it did, well I thought that would just be a great excuse to build a stroker, which I wanted to do anyway.

now at 110k, with a very disturbing clack coming from the valvetrain (you can be sure I'll post a question about it in OEM once I've investigated it further), and my DD jeep already stripped to the bone for an expensive soundproofing project, not to mention a clunk from the drivetrain that might be a ujoint or a pinion going out, not got a whole lot of extra cash, and no good place to do a build

.. and I am thinking that my previous thinking was really, really, really immature and dumb.

And I threw out my airbox a couple months ago while I was cleaning :dunce:
 
I switched back to the factory style airbox last weekend, since after I got to go play (finally!) I found mud/silt tracks INSIDE the air tube going to the throttlebody. NOT GOOD. I am trying to talk my boss into letting me "borrow" the air cleaner set-up from the back-hoe for my Jeep, but somehow, I don"t think that he is going to let me have it.
 
i dunno...been running the 9" cone K+N for about 6 years now....the jeep has had over 80K put on it (its at 205K now) and is doin just fine. the intake tube is as clean as a ......

i do not clean the filter but once every year or so. this is in the desert.
 
I've been hateing my K&N for a while, but have not been sucsesfull at finding a paper eliment filter that will just replace it on a rockit (turbo city) tube. Is there such a thing or do I have to make more changes?
 
The filter GoJeep has is a standard 2 stage industrial filter. The plastic vanes on the end of the filter cause the air to swirl as it passes through...the resulting centrifugal force causes some of the dirt to be deposited in the "cup" on the bottom of the filter which can be removed to service it.

The air then is filtered through the pleated paper element. Very good filter.

Grease the gaskets to make sure it seals up well and you are good to go. Add in a pressure monitor gauge to tell you when it's time to change the filter.
 
XJJack said:
I've been hateing my K&N for a while, but have not been sucsesfull at finding a paper eliment filter that will just replace it on a rockit (turbo city) tube. Is there such a thing or do I have to make more changes?
Click to expand...
www.aempower.com

Kyung
 
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