K&N Drop in filter
Professional
Joined: Aug 2007
Posts: 197
Likes: 0
From: So Cal
RE: K&N Drop in filter
Perhaps this is a biased source, but it aligns with what I learned about dry vs wet filters:
http://www.knfilters.com/filter_facts.htm
Here's an excerpt, more info on the website.
"Most people believe that all air filters function on a go/no go basis where dirt particles that are larger than the openings in the filter media are trapped while particles that are smaller than the openings can pass right through. A dry paper air filter does function in this manner. That’s why paper filters are so restrictive to air flow. The openings in this type of filter have to be very small to filter efficiently."
"The oiled cotton media used in the K&N air filter functions in an entirely different manner. There are scientific principles that determine how an air filter removes dirt particles from the air stream. The first of these principles is known as interception, which applies to dirt particles traveling with the air stream. Air flow will always take the shortest path and as the air is forced to flow around the filter’s fibers some of the particles will contact the sides of the fibers and be captured. These particles are then held in place by the oil or tacking agent in the fiber."
As far as personal experience with the K&N drop-in, I did log about an 0.5mpg increase on an '00 Sierra Extended Cab 2wd5.3L I used to have. And I could feel the difference in throttle response. Planning to put it on my Hemi after I finally find some time to drag my *** over to Pep Boys.
http://www.knfilters.com/filter_facts.htm
Here's an excerpt, more info on the website.
"Most people believe that all air filters function on a go/no go basis where dirt particles that are larger than the openings in the filter media are trapped while particles that are smaller than the openings can pass right through. A dry paper air filter does function in this manner. That’s why paper filters are so restrictive to air flow. The openings in this type of filter have to be very small to filter efficiently."
"The oiled cotton media used in the K&N air filter functions in an entirely different manner. There are scientific principles that determine how an air filter removes dirt particles from the air stream. The first of these principles is known as interception, which applies to dirt particles traveling with the air stream. Air flow will always take the shortest path and as the air is forced to flow around the filter’s fibers some of the particles will contact the sides of the fibers and be captured. These particles are then held in place by the oil or tacking agent in the fiber."
As far as personal experience with the K&N drop-in, I did log about an 0.5mpg increase on an '00 Sierra Extended Cab 2wd5.3L I used to have. And I could feel the difference in throttle response. Planning to put it on my Hemi after I finally find some time to drag my *** over to Pep Boys.
Joined: Apr 2007
Posts: 10
Likes: 0
RE: K&N Drop in filter
When I bought my '03 2500 Quad 4x4with the stock Hemi, I was getting 9mpg/city and 12-13mpg/hwy. I added Flowmaster catback duals and a K&N drop in filter, and guess what my fuel economy is now? 9mpg/city and 12-13mpg/hwy..... Expensive add ons for no better gas mileage. I'm very unimpressed with the fuel economy of this truck and if I had to buy it again, would have gone with the diesel or a Ford... My '98 Quad 4x4with the 360 got 13 and 16mpg's....
Professional
Joined: Sep 2007
Posts: 229
Likes: 0
From:
RE: K&N Drop in filter
got to be honest I was considering K & N until I found out about the recall they had on 2nd & 3rd generation. I think I am going with the mopar performance one now. I still think they are better than factory and paper but personally I am a little hesitant.
Professional
Joined: Aug 2007
Posts: 197
Likes: 0
From: So Cal
RE: K&N Drop in filter
Okay, ya got me curious on the recall, so I googled "K&N Recall", here's the results I found most interesting:
From K&N:
http://www.knfilters.com/FIPK/tuberecall.htm
From NHTSA:
http://www-odi.nhtsa.dot.gov/cars/pr...p;summary=true
And last but certainly not least, from our own beloved forum, circa June 2007:
https://dodgeforum.com/m_841914/tm.htm
So it looks like the recall was not on the drop in replacement filter, it was on the FIPK (the tube was defective, not the filter element of the FIPK), which was also marketed under Mopar Performance. Just a hunch, but I'd bet the drop-in from Mopar is also a K&N.
Just food for thought. I'm still sold on K&N, been using them since '87 onvarious vehicles, no issues.
From K&N:
http://www.knfilters.com/FIPK/tuberecall.htm
From NHTSA:
http://www-odi.nhtsa.dot.gov/cars/pr...p;summary=true
And last but certainly not least, from our own beloved forum, circa June 2007:
https://dodgeforum.com/m_841914/tm.htm
So it looks like the recall was not on the drop in replacement filter, it was on the FIPK (the tube was defective, not the filter element of the FIPK), which was also marketed under Mopar Performance. Just a hunch, but I'd bet the drop-in from Mopar is also a K&N.
Just food for thought. I'm still sold on K&N, been using them since '87 onvarious vehicles, no issues.
Champion
Joined: Aug 2005
Posts: 3,313
Likes: 8
RE: K&N Drop in filter
Some volunteers who owned Duramax Diesels did this
independent test of filters several years ago
which I think is one of the most unbiased available:
http://home.stny.rr.com/jbplock/ISO5011/SPICER.htm
One little detail about this study that is worth thinking about:
The original web host for this study was paid several thousand $ to take it offline by an unknown payer. It was gone from the web for more than a year before other volunteers found that it was stored on Google's Internet Archive and these volunteers pulled it out the archive and reposted it on the weblink above.
Two graphs that tell you 90% of what you need to know:
and this graph that shows that 'good' paper filters don't clog up as fast as the oiled gauze and foam ones:
if you understand what the two graphs above are telling you
then you also understand that most magazine tests are rigged....the right way to test would be to start with a new clean paper filter and a new clean aftermarket CAI and then put about 10,000 miles on both before doing the dyno tests.
How do most magazines "rig" the dyno test?
They compare an extremely dirty paper filter that has been run on dusty dirt roads behind other vehicles to a new & clean & still low restriction aftermarket CAI filter.
Don't be a sucker.
Look at the restriction numbers on the second graph and how the inches of water restriction climbs as dirt is stopped by the various filters.
Now you know why there is a yellow and black colored 'Filter Minder' on Cummins Ram pickups.
independent test of filters several years ago
which I think is one of the most unbiased available:
http://home.stny.rr.com/jbplock/ISO5011/SPICER.htm
One little detail about this study that is worth thinking about:
The original web host for this study was paid several thousand $ to take it offline by an unknown payer. It was gone from the web for more than a year before other volunteers found that it was stored on Google's Internet Archive and these volunteers pulled it out the archive and reposted it on the weblink above.
Two graphs that tell you 90% of what you need to know:
and this graph that shows that 'good' paper filters don't clog up as fast as the oiled gauze and foam ones:
if you understand what the two graphs above are telling you
then you also understand that most magazine tests are rigged....the right way to test would be to start with a new clean paper filter and a new clean aftermarket CAI and then put about 10,000 miles on both before doing the dyno tests.
How do most magazines "rig" the dyno test?
They compare an extremely dirty paper filter that has been run on dusty dirt roads behind other vehicles to a new & clean & still low restriction aftermarket CAI filter.
Don't be a sucker.
Look at the restriction numbers on the second graph and how the inches of water restriction climbs as dirt is stopped by the various filters.
Now you know why there is a yellow and black colored 'Filter Minder' on Cummins Ram pickups.
Captain
Joined: Apr 2007
Posts: 566
Likes: 2
From: Western PA
RE: K&N Drop in filter
Here's another site with a test not conducted by any filter maker.
http://www.bobistheoilguy.com/airfilter/airtest1.htm
Even K&N admits that their filters onlyfilter within 1% of stock oem. The way I look at it, they were created forever ago for racing, where engines never last long enough to show any long term effects. Also, I don't care about the "scientific" design where it can filter better but allow more air to flow. Maybe true, but testing shows that reaches a saturation point rather quickly. Again, this all pertains to drop-ins not CAI's.
http://www.bobistheoilguy.com/airfilter/airtest1.htm
Even K&N admits that their filters onlyfilter within 1% of stock oem. The way I look at it, they were created forever ago for racing, where engines never last long enough to show any long term effects. Also, I don't care about the "scientific" design where it can filter better but allow more air to flow. Maybe true, but testing shows that reaches a saturation point rather quickly. Again, this all pertains to drop-ins not CAI's.
Professional
Joined: Oct 2005
Posts: 212
Likes: 0
RE: K&N Drop in filter
I just bought my truck with 4k miles on it. The previous owner put a K&N drop in filter in the air box. I plan to upgrade to a complete CAI soon. If anyone is intersted I would sell it reasonable! Please keep in mind that I don have the box or anything. I did remove it the other day to see the condition and it looks brand new. I have no idea how long it has been on my truck but my truck now only has 5k so I would guess it hasnt been there long!BTW this is an 07 hemi!
Professional
Joined: Oct 2005
Posts: 212
Likes: 0
RE: K&N Drop in filter
Hey guys, I nowhave a K&N drop in filter for the hemi’s 03-07 Ram 4 sale. I believe it also fits some of the older 5.9L dodge trucks. Please visit www.knfilters.com and check your vehicle to see what the part number is for the drop in that fits your truck. The K&N part number is 33-2247. My 2007 truck has 5k miles and the filter itself has about 2k miles. I just took it out and you can’t tell it has been used. I only have the filter, no box or anything! I have purchased an aftermarket intake and no longer have a need for the filter. If I don’t receive any takers I will be listing it on ebay. Please make me some offers. I know most stores on the internet sell the filter for at least $50 +SH. I am actually out of town at the moment and I wouldn’t be able to ship the filter until 10/8/07 at the earliest! The drop in has been reported to be the best performance filter in testing over all full CAI kits!
