drop in k & n dont just say there bad(explain) - PowerStrokeNation : Ford Powerstroke Diesel Forum
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post #1 of 50 (permalink) Old 02-03-2009, 11:18 PM Thread Starter
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drop in k & n dont just say there bad(explain)

Alright guys whats the deal with the drop in K & N filters bein bad on these motors? I have a 2002 7.3 with the stock air box. now i can see that the stock air box seals off completely around this filter and the air will have to go through the k&n so whats so bad, K&N says over 99% at stoping dirt so whats the deal? is there another drop in that is better? i want to keep the stock airbox set up so a drop in is my option. i can see if mabey you didnt oil the k&n prperly that it might let a lot of dirt though. but anyways let me know what yall know bout the k&n drop in.

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post #2 of 50 (permalink) Old 02-03-2009, 11:20 PM
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Re: drop in k & n dont just say there bad(explain)

Well, 99% isn't right, it's more like 96%. this causes a sandblasting of the turbo and motor. This is why they're generally not recommended.
On top of that, the 6637 is cheaper and better filtration.

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post #3 of 50 (permalink) Old 02-03-2009, 11:20 PM
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Re: drop in k & n dont just say there bad(explain)

They're bad.














Actually someone did a really big private study on air filters a while back. Pretty sure that's where everyone is getting their info about the poor filtering qualitys of the K&N. I'll have to see if I can find it. I've also seen a mechanic or two talk about the dusted motors they've seen using the K&N.

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post #4 of 50 (permalink) Old 02-03-2009, 11:21 PM
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Re: drop in k & n dont just say there bad(explain)

They do suck...I have seen a dusted motor and intercooler with 2 different types of K&N filters with oil, wouldnt recommend them, Put a tymar filter on!

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post #5 of 50 (permalink) Old 02-03-2009, 11:22 PM
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Re: drop in k & n dont just say there bad(explain)

First of all the 99% rating is coarse dust. You have to look a little deeper to see what is actually getting by. My opinion is that most of the problems people have with K&N drop-in filters comes from improper installation. I have used them on 3 different gas engines with no problems. K&N instructs you to use white grease on the sealing surface and 99% of the people install them dry.
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post #6 of 50 (permalink) Old 02-03-2009, 11:22 PM
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Re: drop in k & n dont just say there bad(explain)

Wix 6637 the $50 or less fix.


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post #7 of 50 (permalink) Old 02-03-2009, 11:34 PM
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Re: drop in k & n dont just say there bad(explain)

The problem with K&N???

Is the POS stock air box. I've been running a K&N filter on my truck for a long, long, long time.

I have never noted anything that was worn from any sort of lack in air filtration. My compressor wheels always look just like they did when I got them. Cylinder wall wear was a non-issue when my engine was torn down last year after having run a K&N for over 180,000 miles. I'm a General Contractor on the jobsite every day too. The entire inside of my truck is covered in dirt. I think you could grow corn on my dash before I break down and clean it each time.

I think a lot of people like to worry about things that don't make a damn.

Get rid of the stock airbox because it's the biggest piece of sh*t on the planet. I put the donaldson box on the wife's excursion (Aka Ford AIS). I think it's about the best filtration you'll find if you want to get super anal about it.

Otherwise, put a filter on there and rock out. Just make sure you throw that stock box as far from yourself as possible first, and you'll be fine.
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post #8 of 50 (permalink) Old 02-04-2009, 12:01 AM
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Re: drop in k & n dont just say there bad(explain)

Agreed, get rid of the stock box...

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post #9 of 50 (permalink) Old 02-04-2009, 12:07 AM
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Re: drop in k & n dont just say there bad(explain)

I've had two oil analysis done on my truck. One was at 50,000 miles and the other was at 75,000 miles. Both times the oil had about 3,600 miles on it. The highest iron or silicon I've had was 4 ppm. That was with a stock air box and a stock filter.

If only those who knew what they were talking about replied, this thread would still be on page one.
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post #10 of 50 (permalink) Old 02-04-2009, 12:08 AM
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Re: drop in k & n dont just say there bad(explain)

One of the major issues is the stock box but that is compounded by the rubber surround of the K+N. The rubber is too hard to seal correctly. Thus the grease they tell you to use. The grease closes those voids. I have personally had two SD's come in (to our shop) with drop in K+N's with junk engines due to dirt ingestion.

I also don't like holding a cleaned and oiled filter to the sun and see the large holes in the media that the sun shines through. I also don't care to wait and hour or more for a filter to dry so I can reoil and drive my truck.
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