Engine/Transmission (1998.5 - 2002) K&N Filter

[SAvery]

Just a quick question. I know that the K&N's flow more air, so for those who are running one, did you notice a that your turbo sounds a lot stronger and whistles louder? I am pretty sure that the airflow is the reason why, and I put the filter in properly using the sealer for the edge. I just wanted to know if this is the case with everyone and not just me because of an installation error somehow.

 

[MACHINEST]

Itcould be that it flows more air,also the filter may be more open,a lot of people like the K&N and you will find a lot of people who don't,,,be your own judge,after a few hundred miles,pull your black rubber tube off your turbo,and look for signs of dirt!

 

[Soot4Life]

Yes... ... When I went from a stock filter to the K&N it made for some extra turbo music. After removing the silencer ring I added about ten 1" holes to the stock box and it made even more music. I changed to a BHAF after I found a dusty, oily reside downstream from the filter @ the turbo intake.

 

[Dual EE]

I noticed my was quite a bit louder over the stock paper filter.



Save your old filter (if it's worth saving) and use it when you are cleaning the K&N. The K&N has to dry completely before oiling.

 

[Texas Diesel]

My turbo whistle was louder with the K&N.



Do your oil analysis. When I had a K&N in mine my silicon jumped to 34PPM, now I have BHAF and the silicon is back to 5PPM. Some work right and some dont.

 

[cmills]

I too had a little more turbo whine with the K&N, but I had more silicon With the K&N on the oil analysis than I did with the regular paper filter, so I switched back to paper.



Cory

 

[Mundgyver]

The term "Filter" means to prevent ingestion of dirt for our applications. A K&N is more like a window screen. Hold a new one up to the light and you can see right through it. Little pin holes and such. Pin holes allow dirt to get through as well as air. My engine is way to expensive to trust a K&N.

 

[SHobbs]

I replaced mine with the B. H. A. F Cummins part number AH19037. I found that every oil change I had to re-oil the K@N due to that fact it was dry, guess the turbo was sucking the oil out of it. I started discovering a film of oil on the blades of the turbo, and the intake hose between the tubo and the filter. Not all K@N users have had problems, but I have heard that Cummins says not to use them. With the B. H. A. F and an outerwears cover the filter will last a long time.

 

[dpuckett]

I started a thread about the K&N "filters" in the 1st Gen forum a few months back, complete with pictures of the dust in the intake hose (where it miserably failed the clean finger test, much white glove). I had no problems in the sandier Colorado prairie, but here in the dusty swamp, where the dirt is REALLY fine, it is about the same as a window screen. I went back to a stock filter on mine; put a used BHAF on Mom's.



God, no better than their air filters are, makes me wonder about their oil filters. Sorry, Fleetgard only for me.

Daniel

 

[Lube Man]

Although I had been an AMSOIL dealer for a couple of years I was reluctant to use their air filter. However, another dealer a few miles away invited me over to observe some tests on various filters using a special testing device.



The device basically consisted of a machine that could create vacuuum and an inlet nozzle where various filter elements could be installed. The machine could measure air pressure on both sides of the filter. The less pressure drop across the filter was an indication of greater air flow. There was also a special filter that could be installed behind the filter being tested to trap any particles that got through.



We tested a stock filter, a K&N filter and an AMSOIL filter. We used a fine sample of typical roadside dirt. Here were the results:



The K&N filter had a considerably better air flow than the stock filter but also allowed quite a bit more dirt through. The AMSOIL filter also had a considerably better air flow than the stock filter and allowed no dirt through. The stock filter allowed only a trace of dirt through.



That convinced me to install the AMSOIL filter. But being an engineer I wanted further assurance I did the right thing. So after about 7500 miles I had the oil analyzed and the silicon content was normal.



Soooooo, in my opinion, I would stay with a stock filter, steer clear of K&N, and I would be sure any replacement is not worse than what it replaces.

 

[Lube Man]

Clarification of my previous remark.



I would stay with a stock filter versus a K&N. Obviously I replaced mine with an AMSOIL. There may be other good filters out there, better than stock. Just be sure you get one that does the job.

 

[rblomquist]

What are you guys paying for the fleetguard version of the BHAF?

 

[CumminsPower98]

K&N drop in with the edges greased up good gave me 51 PPM silicone so off to the BHAF and the silicone has been coming right down.

 

[SAvery]

Hate to sound stupid, but what is BHAF? Everyone loves the computer chat acronyms so much these days that there needs to be a little legend somewhere for guys like me who are only occasional posters

 

[Forrest Nearing]

Big Honkin Air Filter



or



Big Honkin' A** Filter



depending on how redneck you are

 

[rblomquist]

Originally posted by SAvery

tere needs to be a little legend somewhere for guys like me who are only occasional posters

There is. Check the 1st time owners forum.



https://www.turbodieselregister.com/forums/showthread.php?threadid=49796