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Old 11-04-2009, 12:01 AM   #1 (permalink)
Wa_rWagon
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How to roll coal on 6.5 .:OR:. K&N didn't make the claimed 50,000 miles w/o cleaning.

I thought for sure I had serious injection problems on the 6.5 I just got. White smoke on start up... No... More like a fog bank in the parking lot. Black smoke on acceleration where headlights disappeared behind me...

I am not sure what to feel worse about here. The dirt that went through the filter for it to catch this much dirt at 96% OR the fact that it sucked in the airbox foam, supplied by K&N to get their cr@ppy filter to fit, for total filter bypass. Had the foam held this engine would have quit running I bet from no air.

If you look close at the turbo you will see the blades are black. Perhaps this layer of dirt the K&N let by will protect the blades from further erosion?

In any case can the testing and marketing department at K&N help me determine the negative horsepower gain this plugged low capacity filter gets me? I know first hand it put the fuel economy below that of a old gas engine!

I wish people would quit falling for these junk filters.

Yes your eyes are correct, the line of dirt on the filter above the belt sticker is almost full to the top of the pleats.
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How to roll coal on 6.5 .:OR:. K&N didn't make the claimed 50,000 miles w/o cleaning.-1993td_kn.jpg  
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Old 11-04-2009, 01:21 AM   #2 (permalink)
chevyinlinesix
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That's one hell of a dirty filter I'm on the fence about getting one for my 6.5 still
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Old 11-04-2009, 01:52 AM   #3 (permalink)
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I'm not a big K&N filter fan. I believe studies have proven it to be one of the worse filtering filters out on the market.

How many miles do you have on that filter?
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Old 11-04-2009, 07:36 AM   #4 (permalink)
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when i got the truck from my brother it had a k&n filter on it . but after joining this site and reading and reading i changed it to a 98 air box with the round filter. not a big fan ether
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Last edited by Liftemhigh; 11-04-2009 at 07:37 AM.
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Old 11-04-2009, 09:23 AM   #5 (permalink)
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Where is the problem ? Clean it out once a year, spray it with new oil and you'll never have the porbs you got.

I'm totally satisfied with my K&N, cauz I service it once every year - regardless of the driven kilometers.


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Old 11-04-2009, 09:40 AM   #6 (permalink)
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K&N = Junk in my book.

i had one in my truck's original flat panel airbox. even when it sealed properly the oil vapors from my CDR were totally covered in dirt. What's the point of a "performance" air filter if it lets more dirt in?

After seeing that i switched back to a paper air filter in that setup, and ran that until i swapped to the 97+ round filter style. That now has an Amsoil non-oiled filter in it, and it filters very well.

No more K&N's for me.
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Old 11-04-2009, 09:46 AM   #7 (permalink)
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Quote:
Originally Posted by Wa_rWagon View Post
I thought for sure I had serious injection problems on the 6.5 I just got. White smoke on start up... No... More like a fog bank in the parking lot. Black smoke on acceleration where headlights disappeared behind me...

I am not sure what to feel worse about here. The dirt that went through the filter for it to catch this much dirt at 96% OR the fact that it sucked in the airbox foam, supplied by K&N to get their cr@ppy filter to fit, for total filter bypass. Had the foam held this engine would have quit running I bet from no air.

If you look close at the turbo you will see the blades are black. Perhaps this layer of dirt the K&N let by will protect the blades from further erosion?

In any case can the testing and marketing department at K&N help me determine the negative horsepower gain this plugged low capacity filter gets me? I know first hand it put the fuel economy below that of a old gas engine!

I wish people would quit falling for these junk filters.

Yes your eyes are correct, the line of dirt on the filter above the belt sticker is almost full to the top of the pleats.
I had a K&N in my 01 3/4 ton Suburban and I would clean it every 6 months just cause I was scared about getting dirt in my engine. I did it exactly as the instructions said to. My oil was ALWAYS dirty after a short time of running it.

I decided one day to buy an AC Delco and put it in. I had just as much or more power and my oil stayed clean til I changed it. I think those kind of filters are one of the worst things for an engine.

Like I've said before More air=More dirt

You couldn't pay me to put one of those in.
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Old 11-04-2009, 09:51 AM   #8 (permalink)
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Originally Posted by Green Machine View Post
I'm not a big K&N filter fan. I believe studies have proven it to be one of the worse filtering filters out on the market.

How many miles do you have on that filter?
Unknown miles. Just bought it used with the filter.

I have walked over K&N before. When the dirt getting by the filter mucked up the idle air control on a 5.3L and it would stall while trying to idle. Just caked the dirt on the pintle and closed down the air the engine could get. Cleaned the pintle, put on a AC Delco paper air filter and burned the K&N. That filter was never serviced or had the need to be serviced in it’s short life.

After running the K&N all you have to do is wipe your finger on the “clean” side of the duct. You will have dirt on your finger where the paper filter, or other better filters, do not do this. Further the foam to seal the K&N square filters is a bad idea prone to failure and filter bypass. Not that bypassing a K&N means much...

If you are on the fence I suggest looking at other aftermarket filters that really filter. Not the overrated K&N gravel screen.
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2008 "Two cards four swipes" 2500HD 6.6L. Killerbee prototype LMM tune, TD-EOC, Optima battery Mod , 115,000 miles. Is missed

2005 RCLB 6.6L AFE MP from Alligator Performance.

1995 K2500 6.2 Boyce military repower Suburban, Large Turbo, 6 program OBDI tune chip.

Totaled
1993 "Clunkie" Cash for clunkers reject. GMC 4x4 Sierra 2500 6.5TD ext cab long bed. Overdrive is overrated. My pickup has hit more Elk than your gun!

Another 1993 Chevy k2500 6.5 Diesel LB 4x4 project beater... To replace the GMC.
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Old 01-03-2010, 01:51 PM   #9 (permalink)
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I recently purchased a 97 K1500 Ext-Cab S/B Z71 6.5 TD with a K&N filter installed by the previous owner. I had a K&N on my old 6.2 with the Banks Air Intake and thought it made a huge improvement in the way it breathed. I got better mileage too.

I was at my mechanic's yesterday getting the new 6.5 checked out, replacing warn out parts, and changing fluids. We're friends, so I stuck around and helped a bit while he worked on my truck. When he checked the air filter he smirked when he saw it was a K&N. He immediately told me to get rid of it claiming they were junk. Not only did he say that they let too much dirt into your engine, he went on to say that all the flow tests that they show in the ad's are all b.s.

Furthermore, he claimed that the oil used is thses filters get sucked through the filter and coat the sensor's that are used for your mass air flow sensor. Once coted with this oil, it will cause false reading's to both your engine computer and transmission casuing it to think you're truck is taking in less air. I'm hope I'm explaining this correctly. My mechanic is licenced and highly competent, he is not some back yard hack. He's extremely knowledgable.

He claims that the K&N filter in his Chev K1500 caused his automatic transmission to prematurely wear out his clutch plate's because of this.

He also said that all Dodge dealer's recently received a warning from Cummins stating that any truck with an pre-oiled K&N type filter that is in the shop for engine warranty will not be covered if this type's of filter's are found to be installed.

I was stunned by what he said. I've used K&N filter's on all of my road vehicle's for the past 20 years. I used to use them on my 4 stroke dirt bikes, but didn't like the way they let in fine dirt.

To make a long story short, he insisted to go back to a stock air filter.....


What do you guy's have to say about all this......????
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Old 01-03-2010, 01:56 PM   #10 (permalink)
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The ONLY problem I see with K&N Filters are when people over oil them. Properly cleaned and oiled you shouldn't have any problems with the filters. And I believe they don't filter as good as other filters out there, but they still are good enough to run on the vehicle (or else they wouldn't sell many of their filters lol).
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