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Topic Review (Newest First)
05-26-2013 02:04 PM
Up Hill Bill
Quote:
Originally Posted by strickerje View Post
Wow, our samples weighed around 150 grams brand new, and they collected 220 g before the flow restriction doubled (that's our measure of capacity). I didn't think there's be that much variation... I guess it's back to the visual method then?
I'll probably weigh the new filter when I replace this one to get the tare weight and then just keep track of the gain over time/miles.

In the past, I just looked at the filter to judge the need for replacement. But, I like adding this additional metric. The two together should prove to be more reliable than just the eye-ball method.
05-25-2013 11:29 PM
strickerje
Quote:
Originally Posted by Up Hill Bill View Post
Along with an oil change today, I weighed the original OEM air filter.

146 grams after 22 months and 9000 miles. Some of it on the dustiest roads imaginable. I do stay WAY behind vehicles in front of me to avoid the dust. But, it sounds as though I'm going to be good for the owner's manual recommendation of 16,000 miles in dusty conditions, at least!
Wow, our samples weighed around 150 grams brand new, and they collected 220 g before the flow restriction doubled (that's our measure of capacity). I didn't think there's be that much variation... I guess it's back to the visual method then?
05-25-2013 07:30 PM
sparky Look at it. If it's dirty replace it.
05-25-2013 03:43 PM
Up Hill Bill
Quote:
Originally Posted by strickerje View Post
I always take the scientific approach. Honestly, I was amazed at how much dust was on there after our test, so I'm sure no one will actually let their filter go that long, but it's good to know it can.
Along with an oil change today, I weighed the original OEM air filter.

146 grams after 22 months and 9000 miles. Some of it on the dustiest roads imaginable. I do stay WAY behind vehicles in front of me to avoid the dust. But, it sounds as though I'm going to be good for the owner's manual recommendation of 16,000 miles in dusty conditions, at least!
05-22-2013 02:01 PM
strickerje
Quote:
Originally Posted by Osage Orange View Post
Hmmm.... You're going to make me place my air filter on my digital reloading scale now!
I always take the scientific approach. Honestly, I was amazed at how much dust was on there after our test, so I'm sure no one will actually let their filter go that long, but it's good to know it can.
05-22-2013 01:16 PM
Osage Orange
Quote:
Originally Posted by strickerje View Post
you should replace the filter when it weighs 370 g (or sooner if you prefer).
Hmmm.... You're going to make me place my air filter on my digital reloading scale now!
05-22-2013 01:02 PM
Up Hill Bill
Quote:
Originally Posted by strickerje View Post
.... you should replace the filter when it weighs 370 g (or sooner if you prefer).

...
Now there is another great jewels of info posted on the forum that I will copy to my permanent reference file on JK maintanance!

Thanks, stickerje!
05-22-2013 12:04 PM
strickerje
Quote:
Originally Posted by strickerje View Post
While this has mostly been covered, I feel compelled to give my 2 cents...

First of all, one minor correction: the stock filter is fabric, not paper. (Note the difference compared to the Durango and Grand Cherokee filters, which are paper.) The fabric filter is a little cheaper to produce while still providing acceptable performance. Paper would be marginally more efficient (stock is already around 99%) but have a lower dust capacity (that is, not last as long before needing replacement). I checked the Wix replacement filter, and its design is basically the same as stock (same material). I didn't check any other brands.

Obviously, the primary consideration for an off-roader is efficiency. I wouldn't recommend a high-flow filter (like the K&N) unless your Jeep won't see much dirt.
And I just realized that none of that actually answers the OP's question...

The mileage interval will depend on driving conditions, but I can tell you, based on the filter weight and rated capacity (capacity defined as the amount of dust that will double the flow restriction across the filter element), you should replace the filter when it weighs 370 g (or sooner if you prefer).

One more point I should make - When the time comes, replace the filter with a new one. Don't shake or blow it out, as this can damage the fibers (reducing efficiency), or worse, introduce dust to the clean side.
05-22-2013 11:39 AM
strickerje While this has mostly been covered, I feel compelled to give my 2 cents...

First of all, one minor correction: the stock filter is fabric, not paper. (Note the difference compared to the Durango and Grand Cherokee filters, which are paper.) The fabric filter is a little cheaper to produce while still providing acceptable performance. Paper would be marginally more efficient (stock is already around 99%) but have a lower dust capacity (that is, not last as long before needing replacement). I checked the Wix replacement filter, and its design is basically the same as stock (same material). I didn't check any other brands.

Obviously, the primary consideration for an off-roader is efficiency. I wouldn't recommend a high-flow filter (like the K&N) unless your Jeep won't see much dirt.
05-22-2013 03:32 AM
MrSig I have been running a K&N since 07 and have not looked back. Just clean the intake system once a year and you should be fine. 70,000 miles and going strong. one of the guys in my club has 120,000 and still running great.
05-22-2013 01:26 AM
SoCaljeep08 I have an 08 JK, and to be honest I went against recommendation and installed a K&N Cold air Intake and it has been great!! I did not get a ton of performance increase, but it is definitely a bit quicker out of the hole. The big thing that I noticed that is very important to me is the sound. We all know these 3.8 V6's are pretty weak in the sound department, but if you install a CAI, you will get that motor sound you are looking for.

This is definitely not a must have mod but If you like good sound you will love this. Also, they are right, the stock paper air filtration is the best, but the difference is tiny. Installing a K&N air filter WILL NOT DAMAGE your engine.
05-21-2013 09:31 PM
BacaraJKU Found this thread after thinking to myself, does it really matter??

http://www.bobistheoilguy.com/airfilter/airtest3.htm

I guess to me not having to service the filter every 15k miles is worth a tiny bit more dirt. I don't plan to keep this Jeep beyond the 100k mile warranty so not going to worry about it. Again, it's my personal preference to use a K&N filter, the same way it's my personal preference to use synthetic oil and change my oil every 3-4k miles.
05-21-2013 07:45 PM
overblown Let me google that for you
05-21-2013 07:27 PM
DJL2
Quote:
Originally Posted by overblown View Post
The factory style filter(paper) is high efficiency. As high as it gets actually. If you are looking for high flow(k&n etc) just know that you are trading filtering efficiency for what amounts to little or no gain in performance.
That's somewhat disappointing. Can you post up the specs if you have them? Or a link would be nice...save me some Google-fu.
05-21-2013 06:53 PM
fireguy I saw an air filter test and I believe it was the DOT or EPA testing the air filters and 5 or 6 brands were tested. According to the lab tests the Delco brand out performed the others in all flow tests and in trapping contaminants. WIX was not in the test but I buy them because most fleet truck service centers use them as well as many race teams for various types of racing.
05-21-2013 06:12 PM
Miser
Quote:
Originally Posted by overblown View Post
The factory style filter(paper) is high efficiency. As high as it gets actually. If you are looking for high flow(k&n etc) just know that you are trading filtering efficiency for what amounts to little or no gain in performance.
X2, very well said! The factory filter has a very high tight micron rating, that filters the air and keeps silicon/dirt out of your air induction system. You are better off to stay with the original!
05-21-2013 05:42 PM
chris4x4 X2 against the K&N. I ran one for a while, and pulled some labs on my oil. Silica was maxed out on both tests. Went back to paper (OEM), and it was back to normal. Also did some dyno runs with the K&N and there was no gain to be found. In fact, All the filters I have tried, none showed a performance gain, and none filtered better than OEM. This wasn't on a Jeep, but I cant see the results being different.
05-21-2013 05:30 PM
BacaraJKU I think as others have stated, you can't go wrong with WIX. I use it for oil filter as well.

I'm one who bought a K&N, but did it out of personal preference. I don't drive in silty dust so not worried about it. It will perform fine for my needs with no risk to the engine. However, if I get into super fine dust scenario in an extended off-road trip, I'll probably swap it out. Even then, I'm sure the K&N would be just fine since its my DD.
05-21-2013 05:11 PM
kik Unlike other vehicles with a JK you're better off with a good "paper" filter (Mopar or Wix). Under "normal" conditions I don't go past 15,000 miles.
05-21-2013 04:37 PM
fireguy That is good to know the filter for my diesel runs 40 or 50 bucks so if I can stretch buying one as often that will save me a few $$ that is great.
05-21-2013 04:24 PM
overblown Yeh, don't worry about damaging the filter with an air nozzle. Just don't go crazy with it and it will be just fine.
05-21-2013 04:15 PM
fireguy Stay with a good quality high efficiency air filter. I buy WIX for oil and transmission filters and Delco for air if WIX is not available. K&N allow for more flow but way less air filtration. That might be fine in a very low dust environment but not for extremely dusty dirty air conditions. That is the trade off for better performance of a k&N. You may possibly need a low restriction exhaust system upgrade to get the full benefit of a K&N. The time frame for changing them out should be based on driving conditions when you inspect them when doing the maintenance of your Jeep. You may get 30,000 miles in normal driving but only get 15,000 miles when driving in off road and dusty conditions. Many years ago when I was working in a shop I was told by another mechanic that blowing air out of the filter from the inside out or outside in that the filter would be damaged by the air pressure tearing the fibers. That may be different with today's products being better quality materials, design and new technology that has improved the filters efficiency and durability.
05-21-2013 03:09 PM
overblown
Quote:
Originally Posted by nekojku View Post
So is the only benefit in a K&N drop in air filter is the ability to wash and its durability?
When it comes to these Jeeps, yes. They are resuable. They don't filter nearly as well as paper filters and the extra flow they offer isn't worth anything to speak of.
05-21-2013 03:04 PM
nekojku
Quote:
Originally Posted by overblown View Post
The factory style filter(paper) is high efficiency. As high as it gets actually. If you are looking for high flow(k&n etc) just know that you are trading filtering efficiency for what amounts to little or no gain in performance.
So is the only benefit in a K&N drop in air filter is the ability to wash and its durability?
05-21-2013 01:48 PM
overblown
Quote:
Originally Posted by DJL2 View Post
Anyone know someone selling high efficiency filters? My local auto parts store has paper....and paper. It'd be nice to upgrade!
The factory style filter(paper) is high efficiency. As high as it gets actually. If you are looking for high flow(k&n etc) just know that you are trading filtering efficiency for what amounts to little or no gain in performance.
05-21-2013 05:46 AM
Caveman1965 I replaced mine with a K&N at 300 miles.
05-21-2013 05:34 AM
Blue Rubicon One and then you replace in with a K&N

Attachment 251822
05-21-2013 05:27 AM
DJL2 Anyone know someone selling high efficiency filters? My local auto parts store has paper....and paper. It'd be nice to upgrade!
05-21-2013 04:17 AM
NYC Thanks Rooster, will do this weekend.
05-20-2013 04:35 AM
Rooster76 The user manual (in the maintenance section near the back) says to inspect after 1 year to see if its needed, and it states to replace after 2 years. If you do inspect it I would blow it out with an air compressor.
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