Airbox always breaks when I take them off, but I've never tried to lube them up. Give that a shot, sounds like it might work.

It also sounds like you missed my post when I said that K&N isn't going to hurt your motor, it's the turbo that suffers. Once again, ask K&N how they can get more air flow from the same size filter. Answer: Their super special cotton weave has larger holes to let more air past. These larger holes also let larger dirt particles through! Simple as that! Basic principles for ALL FILTERS whether it's air, oil or whatever. 1 micron oil filter lets very little oil through which is why it MUST be used as a bypass. If you installed a 1 micron oil filter as your main filter, you'd starve your motor of oil. Your fuel filter is 3 microns, but you have a strong pump pushing a thinner fluid directly through it, and if you put that filter before the pump the fuel would barely get through. Pumps hate sucking, but love pushing. Your airbox has nothing pushing the air through, it must be sucked.

And I don't believe anybody that has posted here sells the 6637. It's just a really good, inexpensive, efficient practical air filter, available at your local NAPA.

When I first found these forums about 10 years ago, I had a K&N on my truck, too, becasue I didn't know any better. But after reading all the reports, tests, etc and experiences of the vast memebers on these forums, I changed to the 6637. If you (or me, or anyone) comes to these forums for help and just about 100% of the members say that one filter is bad, is known to trash turbos, but here's an efficient filter you can buy yourself from NAPA (nobody is trying to sell you anything) I'd listen.

Anyhow, if you go with the K&N, make sure that baby seals up and do periodic checks to make sure your turbo stays clean.
Good luck.

 

Conspiracy Theory?........You know, I was wondering the same thing...do YOU work for K&N??...all of your posts to date lean towards an attempt to defend K&N.

The 'cover' not pre-filter, came along shortly after the 6637 was first used here on FTE for.... water intrusion and engine bay dress-up was the initial concern. There never was a need for a pre-filter......BTW: the 6637 is water resistant too!

 

Ok you said the cover is for water intrusion and dress up..... than you said the filter is water resistant. so y do you need the other aka a prefilter.

No I dont work for K and N. If I did y would I send them an email. But i dont understand why ya'll are so defensive, thats just wierd.

Is there any way this thread can be locked Im tired of the 6637 badgering.

 

Don't take these posts the wrong way.
We're just offering our opinions trying to help you out, that's all...

 

Please don't take this the wrong way and I certainly understand your confusion/frustration but.........
The 6637 ability to shed water aka "water resistance" was discovered after the 'cover' was dreamed up by one of our members.

I have not seen an email....... your email or the response from K&N only something you claim to be an email.
I find it hard to believe someone from K&N came to our forum to read these comments.
Even if they did take the time to read the hundreds of negative posts about their product they were not listening
or they would have redesigned their filter to fit the existing air box without the addition of grease to complete a seal.

You stated that it seems like "its a sponsored forum by who ever is selling these paper filters with a pre-filter on it.
That, my friend will put people on the defensive every time.

Again, there is no conspiracy theory here, just plain, honest, hard working folks giving out free advice about the results
of using those products that they discovered through actual use....not computer generated results. a.k.a. "Wishful Thinking"

 

amen jim!

:-x25

 

OK on page 3 about half way down is the post i made about the K and N email. that is the exact email I was sent. I gave him a link to this page and yes he did read it because he points out where my question wasnt answer as of yet and you all keep talking about a 99 air box not a 95.


But again I will run it and check it, if I have any problems I will put back on the stock filter, and bad mouth them. The only difference being I would have tried it not just talked Shmack about it with no expierience.

My only problrm is it could be one of a hundred things causing dirt to get by. Such as not tight clamps, not using grease on the fittings, not having it properly oiled, and just opperator error.


The only reason I am defensive is because K and N has been the leader in air filters and I dont think with all of thier equiptment they would let this go out the door. Why would they puposely put out a bad product? That doesnt make scence to me.

Again thanks for all of the oppinions ( doesnt it seem wierd that when I said ya'll were deffensive, ya'll got more deffensive.....just sayin) THANKS AGAIN

 

Ok cuda jim I read your reply again This is the email I sent them. And im taking off my email adress, cuz i dont want you people to send me crap all of the time.





From: MAJOR94
Sent: Saturday, July 25, 2009 5:07 AM
To: Tech Support
Subject: 1995 F 350 w/7.3 powerstroke diesel

Hi, I have just picked up a used K and N air filter for my 7.3, and I went onto a Ford truck forum to get some help on how to take off the air box. While doing that I was rushed by all of these people saying that K and N air filter are no good. They say your filter lets too much dirt by, even with proper cleaning and oiling people are still ruining turbos and damaging cylinder walls. I want to know how much you stand behind you product. I told everyone that I couldnt believe that the best filter maker in the world would let something like this pass their inspections.
Here is a couple of links to the forum i was on of people throwing away your filters for paper ones and other permanent filter setups.

https://www.ford-trucks.com/forums/86...-bad-idea.html

https://www.ford-trucks.com/forums/870423-k-and-n.html

If there is ant recourse for such problems or a recall I would like to know.
I also asked if any one was running an outerwears prefilter sock, I dont belive they were from the pictures. But would an outerwears solve all of the problems?
Thanks for the help James




AND THIS IS THE EMAIL I GOT A WEEK LATER



James;

K&N stands behind its products like no other company. Our replacement air filters and intake systems are backed by K&N’s Million Mile Warranty. If something happens to your K&N product, K&N will take care of it for you. Beyond warrantying our product, we also take care of the consumer who purchases a K&N product. K&N has a Consumer Protection Pledge, which says K&N will never allow a person who uses a K&N filter to be taken advantage of by a dealership or repair shop if they blame the K&N for causing a vehicle repair. We take an active role and step in and resolve the issue, so that the consumer isn’t caught in the middle. K&N replacement air filters and intake systems are also backed by an Engine Protection Warranty, which covers you for any engine damage, repair costs, or related expenses which occur as a result of using and properly maintaining a K&N product. You can read the full details of our product warranty on our website at http://www.knfilters.com/warranty.htm.

In regards to the posts on the Ford Truck Enthusiasts forum, it seems as if many of the participants take statements such as “I have seen…”, “I have heard…” or “It’s all over the internet…” as facts when they are actually just opinions. It doesn’t appear that any of these people are familiar with K&N filters, how they are constructed, or how they filter the air, so I wouldn’t put too much faith in any posts you read on there. A discussion which started as a question about a 1995 F350 7.3 was quickly hijacked as the participants started discussing all Ford’s problems with the air box on the 1999 Powerstroke 7.3’s, two completely separate topics which have nothing to do with each other. I still can’t see where the original poster’s question was ever answered.

If you have any questions please feel free to contact me at any time.

Thanks,

Steve Gibson
Warranty Department
K&N Engineering, Inc.
steveg@knfilters.com
1(800)858-3333 x4165



I dont know how to make you believe me, but that is what was said.

 

Lets put those emails aside for moment. They have no meaning since they
contain highly slanted, non scientific opinions.

You came here for answers...you don't like the answer you received based
on your fathers 25 years of rebuilding engines. I have 40+ years engine
building experience, does that carry more weight? Not very scientific.


This IS Scientific ISO 5011 Test Results.

Filtering Efficiency:
or Washables don't filter as well as Paper



Restriction to Flow:
or Paper flows better than Washables.
WHAT? Paper allows more air and filters better too?



Over time a washable filter will ruin your turbo impeller. If you had a MAF
(we do not) it would ruin that too. Any oil, repeat any oil that comes in
contact with the MAF sensor will cause it to send false readings to the PCM
making the engine run improperly and if not cleaned will ruin the MAF.


Your call.

 

Hey cuda jim Just curious What type of engines do you build. ( street, race,or diesel; Alcohol, or gas.


Just so ya know what we do not rubbing anything in. We rebuild 410CID alcohol injected 900 hp sprint car monsters.

We also have a guy wanting us to rebuild the engine in his gt40, we told him we couldnt do it for at least 6 weeks he said he would wait.....I cant wait to see this thing....

 

ok..I'll bite...I bought a '95 F250 4x4 SC....it had 240,000 miles on it..."after" I bought this truck I researched them and found this and other forums...I read about K&N filters and investigated my truck...yep...HAD a K&N oil filter...I looked at my turbo vanes and yup...they are toast...one day I'll havta deal with it....but that K&N filter is long gone....went to NAPA and 20 mins to R&R the filters...breaths way better as well...just my .02


mojo

 

sold them both...

 

When I ask a question that I do not have the answer to, I tend to believe the masses. I would never consider arguing with so many people when I am sure at least a few of them have had a real world experience on the topic. I do not believe anyone here is trying to change your opinion of K&N in general. They are just trying to help you with a specific application. I believe everyone has their own opinions as to what is best for them. I also believe you can learn a lot about your vehicle here from a great bunch of people whom for some reason or another have our best interests in mind. I am truely grateful to them for caring so much.

These are just my opinions though. LOL

 

I am not a fan of K& N air filters , I was going to get the volant air box system then I saw a Banks advertisement stating AFE Stage II was a better filter for a 2002 7.3 diesel . What Do You Guys Think ???

 

This thread is goofy, a K&N rep. will always talk up their product or they are out of a job, get an independent study to show an unbias opionion which this thread has.

The 99 filter image was shown to illastrate how much dirt a washable filter allows into the engine.
K&N filters on a dirt track that is used for a couple hours a week or however often you race is different then you personal truck. How often is your race engine built?? even if its 3 years or 5 years you will not see the side affects of long term dirt penitration exposure.

Your K&N rep failed to realise that throw in filters with the stock air box does not seal and they use a stop gap measure of grease to seal. The reason they throw a tube of grease in instead of redsigning the filter for a more pliable seal is cost and liability. If your engine fails or turbo they can comeback and say their filter is intact and that "YOU" the cunsumer failed to use enough grease sealant on the filter.

The reason for the post this late in the game, I just pulled off my friends "K&N CONE FILTER" on his mustang that recieved a cold air intake and everything was sealed and their was dirt in the runner pipes. The small particle sized dirt may not hurt the engine but we are saying they can hurt your turbo.