Trucks & Trailers - K&N air filter - good or bad?

THE HULL TRUTH is the world's largest FREE network for the discussion of Boating & Fishing. Whether you're researching a new boat, or are a seasoned Captain, you'll find The Hull Truth Boating & Fishing Message Forum contains a wealth of information from Boaters and Sportfishermen around the world.




View Full Version : K&N air filter - good or bad?


MIfirst
03-12-2011, 10:45 AM
Bought my new tow vehicle and the previous owner had installed a K&N air filter. I don't really care whether it adds performance or not, I just want to know if the filter does a good job of cleaning the air. Can anyone with experience tell me if these filters work or not. Thanks.


A Few Dollars
03-12-2011, 11:07 AM
Do a search

The majority says they are junk.

K&N Air Intake/Filter Anybody have one? (http://www.thehulltruth.com/trucks-trailers/325417-k-n-air-intake-filter-anybody-have-one.html?highlight=filter)

woodnut
03-12-2011, 11:20 AM
one of the best air filters on the market. Not cheap....


charlie100348
03-12-2011, 11:37 AM
I have used them on my lastthree vehicles and the first two made over 200K this one has 165K but I attribute that to synthetic motor oil more so than the K&N but I would endorse them,

MIfirst
03-12-2011, 12:23 PM
Funny, I searched K&N and that thread didn't come up. Sorry for the repeat.

So far the posts reflect what I've found on the net, some say they are great, others say they are junk. Anyone else out there with actual experience?

WolfLLY
03-12-2011, 12:25 PM
Whats it on? If on a Chevy Duramax, then no it will not filter or flow as well as the stock unit.

obbayer
03-12-2011, 02:27 PM
I like em. 1st one was in a 2000 Impala did 87k on it, and took it out when I traded and it is now in the 03' with another 110k on the same filter.

Based on that I installed one in my Ram Diesel, 50k so far with no issues.

Some claim they let too much dirt thru, since all my miles are highway this has not been an issue, if your off roading, working construction sites or farmland you may consider something else.

Cleaning them needs to be done right, from I have read, many tend to over oil them, the excess oil can then be inhaled by turbos.

Also during the cleaning process, you need to wash and dry it, setting out in the summer sun, pretty quick, during the winter a lot slower. I keep an old paper one around to use the truck, while the K&N is drying, can take hours to dry thoroughly before re-oiling.

MIfirst
03-12-2011, 04:13 PM
Whats it on? If on a Chevy Duramax, then no it will not filter or flow as well as the stock unit.

It's on a Lincoln Navigator 5.4 liter 32 valve

dahlbebop
03-12-2011, 04:27 PM
Have to keep it clean just like any other air filter. Being that they are oil coated, they do a good job with fine particles and you will never have to replace it, just clean it. The cleaning kits I think are about 18 bucks. I clean mine twice a year, but that would depend on what kind of conditions you drive in. Its definately an upgrade to a standard filter. I would say most guys that complain about them or don't like them don't clean them as often as they should be, but I'm just guessing.

Phathog
03-12-2011, 05:17 PM
As Obbayer says, this is not the filter for you if you operate in dusty conditions.

I've been running one for the last nine years (winter only) on my Supercharged 5.4L and have had 0 problems.:thumbsup:

You've got to keep them clean, and DO NOT over oil them. First time I cleaned & oiled, I coated the MAF senser and truck ran like crap.:trout:

jewel
03-12-2011, 06:01 PM
Bought my new tow vehicle and the previous owner had installed a K&N air filter. I don't really care whether it adds performance or not, I just want to know if the filter does a good job of cleaning the air. Can anyone with experience tell me if these filters work or not. Thanks.


G'day MIfirst, after reading a few other forums on the K&N i now have my doubts, here is one link you might like to read, the is quite a few more threads on that forum alone, enough to shy me away from them, others seem to like the filters

http://forums.lr4x4.com/index.php?showtopic=17362

bc22
03-13-2011, 04:08 AM
bought into the air filter trap years ago hoping to gain a few HP.
not worth it IMO, just change your filters regularly.
If i had easy access to a dyno and could prove the gained HP and economy with a K&N initially and over a time period i may have been convinced, but by the seat of my pants feel, and the lack of difference in the wallet savings has led me back to OEM filters.

also it was a PITA to clean and recharge the K&Ns.

i've also now researched and read enough stuff that to suggest clearly factory filters are as good if not better than K&N and similar "lifetime" filters.

save your $ for some other upgrade that will significantly be an upgrade.

Fish13
03-13-2011, 04:17 AM
these are the filters to use if you plan to keep the vehicle for a long time. If not cheaper to replace the paper element all the time.

The nay-sayers saying they dont work in dusty conditions don't understand that they are used in the baja runs, paris to dakar rallies, It all depends on how much oil you use. Or know that these are the filters used on 410 sprintcars too.........

I have had them on all my cars and much much better then the foam elements. The foam elements are fire hazards and engine chokers when they start to disintegrate.

reefhunter2
03-13-2011, 08:44 AM
Junk, but great advertising. Ever notice the OEM parts makers never advertise?

seaox1983
03-13-2011, 08:46 AM
Junk!

Fish13
03-13-2011, 09:00 AM
Junk, but great advertising. Ever notice the OEM parts makers never advertise?

So AC delco don't advertise?
BOSCH doesn't advertise?
Motocraft doesn't advertise?

All OEM for GM, Ford and various other manufactures.

Anyway its up to you to make the decision.

n3up
03-13-2011, 01:58 PM
Don't waste your money.

Any claims of performance gains over stock filters are at wide open throttle, and how many of us drive our vehicles wide open for any significant amount of time?

They tend to foul up MAF sensors even when not over oiled.
Other than being reusable, I think they're mostly hype.

There was one on my truck when I bought it, and I ditched it when I did the first service.

Just use a good quality paper filter, and change it regularly.

K-dawg
03-14-2011, 05:15 AM
Overrated, in my opinion. I've seen pictures of them under microscopes compared to paper filters. The K&N is like looking thru a window, while you can't see through the paper filter at the same magnification. I certainly wouldn't buy one to replace a stock paper filter, but since the thing is already on the truck, it probably doesn't matter much.

And the theories I've read on the K&N state that they work better when dirty than clean.

FWIW, I wait for paper filters to go on closeout on RockAuto, then snatch up a case of them. I can buy 25 paper filters for the price of one K&N.

MRGONET
03-14-2011, 05:30 AM
Believe what you want but my experience has been that every vehicle that i've installed one in has gained at least 1 mpg. To me, this means the engine is performing better and more efficiently.

The concept is based on air to fuel ratios, limiting air flow limits fuel burn.

If these types of mods don't work, then someone please tell that to gale banks engineering as they have their own system developed after the k&n design.

MIfirst
03-14-2011, 07:46 AM
Thanks for all the responses. I think I might go out and get a paper filter and then compare the performance between them to see which I like better.

Leftcoastboater
03-14-2011, 09:44 AM
Think the key is over oiling. Had one on my Suburban and after I cleaned it I used to much oil. Screwed up the MAF. Have one on my Expedition now and only use it when I'm towing. However, I honestly don't know if it runs better with or w/out. I suppose I should try an mpg test next couple runs to the lake I fish. 140 niles r.t. with a 5-6% grade.

Back-in-Black
03-14-2011, 10:06 PM
according to this test they pass less air, more dirt, clog up faster, holds less dirt, than almost any other filter on the market. http://www.scribd.com/doc/23641356/ISO-5011-Duramax-Air-Filter

eazily-amused
03-17-2011, 04:19 PM
Whats it on? If on a Chevy Duramax, then no it will not filter or flow as well as the stock unit.

I would ask what do you base your response on? Actual flow testing? Or just an opinion. I've seen K&N flows and they flow MUCH better than stock.

martynmac
03-20-2011, 07:07 PM
If its just a filter I wouldnt expect a great deal of performance or mpg gain, just the benefit of not having to buy a filter again for the life of the vehicle! I have run K&N's on every vehicle I have ever owned and no complaints. If I were buying one for a truck I would go with a cold air intake.

dht
03-22-2011, 06:48 PM
I put a K&N on my 94 Bronco. I went from 12mpg to 18mpg...... But I can't give all the credit to the K&N because that was the first time the filter had ever been changed in the 14 years since the truck had been made..



Search Engine Friendly URLs by vBSEO 3.2.0