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Unread 09-01-2005, 08:56 AM   #1
timchi
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K&N Air Filter??

Does anyone use a K&N air filter for their 4.0?? I just purchased a new 2006 sport and am wondering if it would be beneficial to put one of these in. Does it help with mpg's??

-and will not be driving in dusty off road conditions anytime soon.


Last edited by timchi; 09-01-2005 at 09:40 AM..
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Unread 09-01-2005, 09:11 AM   #2
orlandohulkjeep
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i use one for off roading only so water does not wreck it. i never did feel any Difference between the two on the road
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Unread 09-01-2005, 09:13 AM   #3
Wheelin98TJ
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For most people, its not worth it.

You may see a few HPs at the top end, but you'll lose low end torque.

Quote:
Originally Posted by orlandohulkjeep
i use one for off roading only so water does not wreck it. i never did feel any Difference between the two on the road
I don't understand this statement. A K&N creates a much easier path for water. If you're going to wheel your TJ, keep the stock box that provides much more protection.
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Unread 09-01-2005, 09:17 AM   #4
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ive used one since i bought my tj in nov. '04. i havent had to recharge it yet. no problems either.
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Unread 09-01-2005, 09:23 AM   #5
tj420jeep
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I use a K&N in my stock air box. My only reason was money. I never have to buy another $17 paper filter. The K&N only cost $30.
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Unread 09-01-2005, 09:27 AM   #6
Jerry Bransford
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The problem with K&N filters is that they are shown and well known to pass more fine dust into the engine. I used to run one and before I finally got rid of it, had placed two prefilters over the top of it to cut down on the fine dust from my local deserts that it was passing. Saving a few bucks to install a new paper air filter at the expense of greater engine wear if you wheel in dusty conditions isn't worth it IMHO. Besides, the 4.0L engine isn't getting more air with the K&N since unlike some other air intake systems, the Jeep 4.0L engine already has a totally free flowing air intake system. Really.
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Unread 09-01-2005, 09:31 AM   #7
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Quote:
Originally Posted by Wheelin98TJ
For most people, its not worth it.

You may see a few HPs at the top end, but you'll lose low end torque.



I don't understand this statement. A K&N creates a much easier path for water. If you're going to wheel your TJ, keep the stock box that provides much more protection.
You get 2 types of K&N systems.
The first (and most commonly known) is the cold air intake system. This replaces your air box with an open type cone air filter. This is the one that is open to water and mud.

The second type (This is what I am running now) is a replacement filter in your standard air box.
I also changed to this set up because my standard filter was getting wet every time I went wheeling and replacement cost in South Africa is around US$60. Now I just wash it with some fuel and spray the oil on after every trip. Much cheaper!

BTW the amount of water that enters the engine is not enough to damage it. It just damages the standard air filter.


EDIT: Oh yes and I think the amount of fine dust that enters your engine through the K&N is negligible. The I6 is a low compression engine that is not like the high performance close tolerance machined engines of the high performance sedans.
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Unread 09-01-2005, 09:43 AM   #8
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Quote:
Originally Posted by tj420jeep
I use a K&N in my stock air box. My only reason was money. I never have to buy another $17 paper filter. The K&N only cost $30.

Same here!
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Unread 09-01-2005, 10:45 AM   #9
bin75
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Quote:
I use a K&N in my stock air box. My only reason was money. I never have to buy another $17 paper filter. The K&N only cost $30.
My reasoning also.
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Unread 09-01-2005, 11:01 AM   #10
zanejones
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I bought a K&N freestanding filter a few months ago. I didn't really notice a huge difference... So I put the airbox back on. I'd rather save up for other Mods.

In other words... I'll sell you a K&N filter... used for two days... CHEAP!
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Unread 09-01-2005, 11:32 AM   #11
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I have the cold air set up. It works great. I can tell difference in power when accelerating on the highway etc. I wheel my Jeep quite often and have yet to have any problem other than the filter gets dirty and I have to clean it.

Desert sand, I'm sure is a whole different situation, but I think that's what snorkles were made for.

I don't know how it does in water, because my Jeep is not a submarine. If I ever got in water high enough to reach the filter, I would be worried about many other things first.
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Unread 09-01-2005, 11:56 AM   #12
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I ran the drop in K&N for years. I was concerned about a fine layer of dust that was accumulating in the air intake so I recently took it out, and put the stock type paper filter back in. You would be really hard pressed to be able to tell any performance difference between the two. No change in MPG's.
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Unread 09-01-2005, 12:06 PM   #13
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I ran the k&n drop in filter for about a year but now i run the paper filter due to the dusty summer. Don't know what i'm doing with the k&n, probably give to whoever wants it for $5. it needs a cleaner kit but other than that, its fine.
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Unread 09-01-2005, 12:38 PM   #14
bcompton
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If you want an oiled, reuseable filter but want better filtering than gauze filters (like K&N), look at True Flow. These are foam filters, and use a stickier oil than the gauze ones.

True Flow has replacement filters, universal cone filters (to retrofit K&N, Airaid, Mean Green, etc), and systems which replace only the restrictive parts of the stock intake (like elbows, etc.). Their Wrangler system isn't out yet, but the replacement filter is.

I have used the replacement filter for three years now, and it replaced a K&N filter. With the K&N, the inside of my intake tube was always coated with fine dust. There is absolutely no dust getting through the True Flow.

I have no data on performance increase, etc., but I have saved money on filters over the years!
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Unread 09-01-2005, 12:39 PM   #15
Jerry Bransford
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Quote:
Originally Posted by bcompton
If you want an oiled, reuseable filter but want better filtering than gauze filters (like K&N), look at True Flow. These are foam filters, and use a stickier oil than the gauze ones.

True Flow has replacement filters, universal cone filters (to retrofit K&N, Airaid, Mean Green, etc), and systems which replace only the restrictive parts of the stock intake (like elbows, etc.). Their Wrangler system isn't out yet, but the replacement filter is.

I have used the replacement filter for three years now, and it replaced a K&N filter. With the K&N, the inside of my intake tube was always coated with fine dust. There is absolutely no dust getting through the True Flow.

I have no data on performance increase, etc., but I have saved money on filters over the years!
I also switched from K&N to a Trueflow air filter.
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