K&N Air Filter - Now Available

[Mires]

I’m surprised someone agreed with me. I figured I’d get criticized for not loving them.

I'm more surprised there aren't more people aware. I thought it was pretty common knowledge by now.

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[Doc]

Had one on a Mustang GT in Florida. Lots of sand made its way past the filter. Never again.

In Alaska people have to go to double air filters on their vehicles do to the tremendous amount of sand in the air on their non paved roads...I guess a CAI would be out of the question in fla also. I live on a one mile dirt road when it’s dry it’s terrible...I just through a towel over the intake until I get to the end of the road...
Regards
Doc

 

[Doc]

In Alaska people have to go to double air filters on their vehicles do to the tremendous amount of sand in the air on their non paved roads...I guess a CAI would be out of the question in fla also. I live on a one mile dirt road when it’s dry it’s terrible...I just through a towel over the intake until I get to the end of the road...
Regards
Doc

B T Y......sand will go through any filter...

 

[RCMUSTANG]

They do have the pre-filter socks for cone filters.

 

[Doc]

They do have the pre-filter socks for cone filters.

10/4
Regards
Doc

 

[toddiscdn]

Ive used a few K&N,s years ago and didnt think much about it, but I learned more as time went on. If you are staying pure street(paved) they may be fine.

They make them for my bike(DR650) and they are frowned on in the dual sport or dirty big bike category as well, for the way the let fine particles by. Ive seen guys run them on the street but never without a prefilter if venturing "off road"

 

[Doc]

Ive used a few K&N,s years ago and didnt think much about it, but I learned more as time went on. If you are staying pure street(paved) they may be fine.

They make them for my bike(DR650) and they are frowned on in the dual sport or dirty big bike category as well, for the way the let fine particles by. Ive seen guys run them on the street but never without a prefilter if venturing "off road"

I’m a drag racer...I have had k and n filters on my 1200 Harley, on 2 of the gsxr 600 s and on the gsxr 1000 but that’s all light street and heavy strip ....no dirt, but I still run the Harley..883/1200 conversion, Andrews N4 cam, Barnett clutch, pirelli sticker tire on the back, 7000 rpm brain and next but not least...we are installing a pingle air shifter and an msd 2 step.so far no problems with k and n....
Regards
Doc

 

[Bubbabiker]

I ran K&N filters on street bikes for years without any issues. With that said I will not run a K&N filter on a forced induction engine.

 

[RCMUSTANG]

Anyone ordering one soon interested in a free hat offer? I just need a name and email address. If you make a purchase, the trade up offer counts, of $50+, we both get a free K&N hat.

 

[THLONE]

Bottom line is the only way to get more air in is to have bigger holes. Or a bigger filter.

 

[Randy2400h]

A lot of people over oil them and I've seen several check engine lights because of it. Often not cleaned as often as should be either. I no longer use them.

Correct. If you oil them as instructed, the residual oil when collect on the Mass Airflow sensor. Then they throw a check engine light because the O2 sensors detect an incorrect mixture caused by MAF sensor showing less air than is actually flowing through the intake.

If you use K&N, you need to use a MAF Sensor cleaner (aerosol spray) a couple hundred miles after Re-servicing the K&N filter with new oil. But people forget to do that and it just continues to collect oil/dirt on the sensor, badly effecting performance until it throws the Check Engine Light. When I used to see them in the shop, I would clear the code, clean the MAF sensor, and throw the K&N in the trash. Presto!

 

[Andy]

I have the AFE dryflow fliter and like it so far. Not out for the trucks yet.

 

[Deleted member 773]

I had a tuned 6.7 F-250 with a big turbo and deleted exhaust, with a race tune, the oversized k&n cone filter would start to collapse under heavy acceleration..

 

[Dean]

Project farm on youtube did a comparison of K&N vs. other filters.

They don't filter squat. If you are racing, then maybe, but not for a daily driver where you want to get long life out of the engine.

 

[Cmar]

I used one on a Nissan Pathfinder diesel I owned once, the only reason being, it was a Japanese home market import model and was hard to find paper filters for as they were not a model formally imported by Nissan dealers in Australia.
I eventually found a K&N which fit (I think it was listed for a Nissan Nomad van)

Being a diesel I had no issues with a MAF sensor, but as it was a turbo diesel it sucked quite a bit of air, and needed fairly frequent cleaning.

The problem with K&N's, is, like oiled foam filters, is that they fail open, the dirtier they get the less efficient they get.

If you don't service them frequently enough, or use them in very dusty conditions, the dust mops up all the tacky oil, as it is designed to, but then with no tacky oil left, the dust now goes straight through as the actual holes are quite large- which is how they get the increased airflow. They rely completely on the oil to catch and trap the dirt.

On the other hand a paper filter fails closed, they are depth filters, the dirtier they get the more efficient they get, the holes are smaller than most dust and sand particles, and they simply block up as they're used, eventually if you don't change them or blow them out, they block up enough holes to affect performance, or on a modern engine - throw a code.
Stock paper filters are better for longevity.

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