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Old 07-05-2009, 08:45 PM   #1
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Time for the K&N to leave

So, I've read all the "bad" stuff about K&N filters here (and in other places) for the last bunch of months. I've kinda stuck to it as it's been "out of site, out of mind".

Well, I cleaned mine today (like I do every couple months depending on what/where I'm jeeping) and here is MY result from 2 months and two offroad trips that started with a clean, well oiled K&N filter:

Uck:

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The damn inside is almost as dirty as the shield:

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So, my question is: Should I go to the junkyard and find a stock box or is there a (much) better option to what I'm running now?

(Yes, I pulled the tube and cleaned the inside).

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Old 07-05-2009, 08:51 PM   #2
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the stock box is fine, and not very restrictive. i'd just do that.

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Old 07-05-2009, 09:52 PM   #3
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oh no! I just bought a new K&N filter. I got a sock to put over it though. And it's VERY dusty here in the desert. If it looks like it aint working good I may go to an AFE or some Airaid or something. Thanks for the warning.
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Old 07-05-2009, 09:55 PM   #4
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I had a K&N for about three months. Hated it.
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Old 07-05-2009, 09:57 PM   #5
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its not just k&n, its the whole cold intake or whatever you wanna call it bs fad, not really all that good for jeeps.
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Old 07-05-2009, 11:24 PM   #6
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Quote:
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its not just k&n, its the whole cold intake or whatever you wanna call it bs fad, not really all that good for jeeps.
I know, I know.

Problem is, that I will eventually want to give that space (where the filter is) away to a compressor for onboard air.

So, I want to find a different way of doing business without driving myself nuts (or broke).
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Old 07-06-2009, 12:26 AM   #7
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If you really don't want to go back to stock then maybe a snorkel, get the intake up out of the dust a bit.
Make sure you're oiling the filter well and use a foam prefilter.

Or
Advanced Air Cleaner Systems
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Old 07-06-2009, 10:44 AM   #8
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i cannt go back to the stock airbox. I'll have to wash the filter each weekend instead i guess. all the buggy and most other rigs here use the cone or aftermarket filters so i think it's not totally detrimental to use these things as long as we keep an eye on them and clean them often
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Old 07-06-2009, 12:21 PM   #9
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Quote:
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...Make sure you're oiling the filter well and use a foam prefilter.
Skeeter,

I've got that wrap pre filter pictured above. I didn't know about the foam prefilters but think a foam prefilter is a better idea than what I've got.

Where would I find those foam prefilters and for the correct size for my particular filter?

Here is a link to the filter I've got.

RX-4870 - K&N Universal Air Filters, Universal X-Stream Clamp-on

Its a 6" OD at the base of the filter... and 5" OD at the top of the filter. The filters overall length is 6.5".

Thanks!

Ben
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Old 07-06-2009, 01:04 PM   #10
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Quote:
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Skeeter,

I've got that wrap pre filter pictured above. I didn't know about the foam prefilters but think a foam prefilter is a better idea than what I've got.

Where would I find those foam prefilters and for the correct size for my particular filter?

Here is a link to the filter I've got.

RX-4870 - K&N Universal Air Filters, Universal X-Stream Clamp-on

Its a 6" OD at the base of the filter... and 5" OD at the top of the filter. The filters overall length is 6.5".

Thanks!

Ben
K&N Airforce Foam Pre-Cleaners for Extending the Service Life of a K&N Air Filter in Extreme Dust
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Old 07-06-2009, 01:54 PM   #11
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What have you been doing? Doing donuts in sand storms?
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Old 07-06-2009, 04:50 PM   #12
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THANKS!

I'll probably keep what I've got for now (the blue sock) and see how that goes. If its still letting in too much dust then I'll get the foam pre filter. They don't have one in the exact size but I can cut one to fit.

Ben
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Old 07-06-2009, 10:19 PM   #13
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I looked at that link. I only shopped it on the KN site but I don't think a 20 dollar foam overlay that "stops 90% of..." is my solution.

Dangit, I saw a post I cannot find a few months ago that compared particle bypass of a bunch of filters.

I'm looking to get RID of the K&N. I just don't want to give them anymore of my $$$ for solvent and oil (on top of what I've already dumped into them) when there has to be a better solution.
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Old 07-07-2009, 10:56 AM   #14
Knows a couple things...

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Stevens243 asked for the air filter comparison chart, here it is. You may have to click on the chart to make it big enough to read...

The text from the test that explains the below chart is as follows:

"In the chart (below) it’s important to note the different test durations for each filter. The AC Delco filter test ran for 60 minutes before exceeding the restriction limit while the AMSOIL and K&N tests each ran for 20 and 24 minutes respectively before reaching max restriction. In 60 minutes the AC Filter accumulated 574gms of dirt and passed only 0.4gms. After only 24 minutes the K&N had accumulated 221gms of dirt but passed 7.0gms. Compared to the AC, the K&N “plugged up” nearly 3 times faster, passed 18 times more dirt and captured 37% less dirt."
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Old 07-07-2009, 11:24 AM   #15
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Jerry is there a trade off here? Is the Delco more restrictive all the way around? It seems to be the best for trapping the harmful stuff but is it restricting more air than average? I have always used the Wix rough service filters.
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Old 07-07-2009, 11:26 AM   #16
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Thanks Jerry. I was sure that was you (ain't it always)?

Alright, gonna do a bit of shopping and I'll let everyone know what I come up with.
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Old 07-07-2009, 11:56 AM   #17
Really?

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I say "GO SNORKLE BABY!!!"

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Old 07-07-2009, 12:01 PM   #18
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I say "GO SNORKLE BABY!!!"

WTF?
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Old 07-07-2009, 12:24 PM   #19
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WTF?

Google "Toilet Snorkel". It's work safe.... and the patent has run out so you can build your own.
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Old 07-07-2009, 12:25 PM   #20
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A possible solution for air if you're in a fire? Sure as hell wouldn't wanna breathe THOSE fumes!!!!
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Old 07-07-2009, 02:27 PM   #21
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I say "GO SNORKLE BABY!!!"

Are you telling me to go puff on the toilet? Why, Cain, why? What did I ever do to you?
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Old 07-07-2009, 02:40 PM   #22
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Are you telling me to go puff on the toilet? Why, Cain, why? What did I ever do to you?
Cuz Skeet started it.

Quote:
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If you really don't want to go back to stock then maybe a snorkel, get the intake up out of the dust a bit.
Make sure you're oiling the filter well and use a foam prefilter.

Or
Advanced Air Cleaner Systems
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Old 07-07-2009, 02:47 PM   #23
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Yeah, but the last time I plugged my jeeps intake into the toilet it pressurized the local sewer district's line to 42 PSI and launched scupper trout out of the holding facility to (records say) 14 stories high.
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Old 07-07-2009, 03:07 PM   #24
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Yeah, but the last time I plugged my jeeps intake into the toilet it pressurized the local sewer district's line to 42 PSI and launched scupper trout out of the holding facility to (records say) 14 stories high.
Those Rubicons are amazing............. my X model could never do that.
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Old 07-07-2009, 03:40 PM   #25
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Those Rubicons are amazing............. my X model could never do that.
Rob, you should take a couple hours off, go home early and try it.

Unless you have a septic tank...even the X could potentially skid mark the entire neighborhood.
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Old 07-07-2009, 07:27 PM   #26
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Old 07-19-2009, 07:51 AM   #27
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I say "GO SNORKLE BABY!!!"

CCain That sig is freak'n funny !!!
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Old 07-19-2009, 01:51 PM   #28
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Get a wet/dry vac sock/filter bag and stick it over it! I saw one fellow jeeper do this and he stated it wrkd real gd!

C.

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