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Unread 04-26-2013, 10:01 AM   #1
carmental
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2014 XJ Cherokee 
 
Join Date: Apr 2013
Location: Andover, MN
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K & N Air filters

Howdy fellow jeepers;
I just ordered a new 2014 Grand Cherokee with the 3.6 litre engine and I'm wondering about getting one of those K&N air filters or air intakes after delivery. Anyone have any experience with these on the 3.6?

The intake runs $200+, the air filter around $70, is there a significant difference in upgrading to the intake?

thanks - Carmental (soon to be Jeepmental)

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Unread 04-26-2013, 11:01 AM   #2
carmental
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Well - I just read through the "My gas mileage sucks" thread, it was not very encouraging. I'm not quite sure how K&N claims a HP increase with their intake when there is no corresponding increase in exhaust flow. The conclusion one could draw is that the existing exhaust on the GC is already built to accommodate additional exhaust output? But then I read that more air by necessity means more fuel, so one would infer that increasing the airflow to the engine would require it to consume more fuel, reducing mileage.

I should have listened to my mother - she said "go to college, be an engineer". But no, I went to college and learned to drink beer.

So now I've talked myself out of, in to, and back out of a new cold air intake. Anyone else want to join the other voices in my head? See if they can convince me to pocket or part with my hard-earned $200?

Thanks - Carmental (I am now at one with my inner duality).
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Unread 04-26-2013, 11:05 AM   #3
Soldier905
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A cold air intake was the best addon i ever did to any of my vehicles it was well worth the money. Installed one on a suburban and got 2 more mpg out of it after install (note old intake/filter was clean but the intake was a maze of turns)
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Unread 04-27-2013, 10:19 PM   #4
NonRubicon
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1990 YJ Wrangler 
 
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K&N filter will keep rocks out of your engine, but that's about it. Don't expect it to do as good a job as an OEM style filter when it comes to keeping dirt and dust out.

K&N filters are race technology, and race tech doesn't always translate to street. Race engines get rebuilt frequently and dirt isn't as much an issue.

By the time the K&N filter gets dirty enough to filter as well as an OEM filter, you've lost the hi-flow benefits.
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Unread 04-28-2013, 06:05 AM   #5
jay-h
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I've seen actual tests (I believe there are links somewhere on JF as well) which plainly show that K&N type filters are considerably less effective at dirt removal, something to consider if you off-road.
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Unread 04-29-2013, 12:12 PM   #6
carmental
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Hmmmm.... I'm not planning on doing much off-roading, but I'm all for giving the motor maximum protection. So the trade-off seems to be improved performance versus improved filtering. I've seen those Crown Royal bags that people wrap around the filter to act as a pre-screen, but have to believe they restrict the airflow even more, further negating any performance improvement.

Some brain-wizard out there needs to develop a more porous filter that effectively traps dust and dirt. Perhaps this is indeed one of those unanswerable questions: Intake or no? Ginger or Maryann? Tomato, tomahto? Big Mac or Whopper?
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Unread 04-30-2013, 07:09 PM   #7
bathfarm
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I have had them on a Jeep (4.00 and a Ram(360) ...Made NO difference in MPG but did help performance a little.
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Unread 04-30-2013, 07:19 PM   #8
jay-h
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There was a time when factory air filters were fairly restrictive, favoring less noise (a noisy filter can kill sales).

However two things happened: Computer modelling has enabled filters to be tuned for low noise even with flow, and at the same time, government regulations are pushing manufacturers to work for every fractional increase in efficiency even if its cost does not make practical sense to the end user. So many factory filters are pretty darned good, though they're costing you a lot.
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