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Old 01-30-2007, 10:47 PM   #31
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well bigjeep many engines are rev friendly. My old miata redlined above 7200rpm I have actually gotten it up to 7400 when the fuel cut off hit Anyhow you only see tests of k&N filters on those kinds of engines. I still havnt seen a dyno on anyengine less than 6000rpm

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Old 01-30-2007, 10:58 PM   #32
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But when are you gonna be @ 4000rpm constantly on a trail?

You guys read this yet?
http://www.jpmagazine.com/shop4parts...lter_upgrades/

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Old 01-30-2007, 11:43 PM   #33
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Obviously not AzTJ.. Again i was talking about the dyno tests and not specifically about the jeep 4.0. Anyhow if i'm understanding this article right it says that K&N Is the be best filter? It doesnt let much dust pass buy it.. it captures everything compared to everything else?
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Old 01-30-2007, 11:46 PM   #34
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Not in reality in the TJ's case. Yes the K&N offers the potential for more air flow but it won't actually flow more CFM than the factory air box does because the engine isn't asking for more air than the factory air box is already providing. In other words, the 4.0L engine isn't starved for air by the OE air intake system which actually breathes very well. The same cannot be said for all vehicles though.
for that to be true, the volumetric efficiency of the engine would have to be 100% ... which is pretty impossible for a production style engine like the 242 ... we ran the numbers in an engines class on a 242 and it was about 82% IIRC (the honda engines were the highest in all catagories averaging about 87% across the field)... the less restrictive filter does help...but not enough to see any power gains ...

so i kind of agree with you ... it will help, but not enough to be worth it at all....
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Old 01-31-2007, 12:20 AM   #35
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It says that its filtration lifespan is greater than the others(between changes) but overall efficiency at filtering is horrible.
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Old 01-31-2007, 12:26 PM   #36
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I am using the K&N drop-in replacement filter, not any of the cold air intake stuff.

All I was looking for was improved filtering performance, and longer life span between filter changing. I believed what I read that the oil impregnated fiber was better at filtering, didn't clog as fast, and gave better air flow.

What I'm understanding is that changing a paper filter more often is going to be better for my engine than using the K&N ?
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Old 01-31-2007, 02:22 PM   #37
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I am using the K&N drop-in replacement filter, not any of the cold air intake stuff.

All I was looking for was improved filtering performance, and longer life span between filter changing. I believed what I read that the oil impregnated fiber was better at filtering, didn't clog as fast, and gave better air flow.

What I'm understanding is that changing a paper filter more often is going to be better for my engine than using the K&N ?
in short ... yes.

the K&N filters dont filter as much particulate matter as a stock paper filter ... hence, slightly more airflow.

the stock filter is better for your engine than the K&N filter.
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Old 01-31-2007, 06:30 PM   #38
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Here is something else thats wird. A shorter intake pipe decreases low end torque. (I dont know if its true with wranglers but with my 96 miata i've seen tests (dynos) of the same car with different lenghts of intakes under same conditions (temp huminity etc) and the torque curve is lower on the short intake but it has spikier hp curve while with the longer intake its hp is less peaky but the torque is more. Any one has a good explanations for this?
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Old 01-31-2007, 07:13 PM   #39
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I don't have an exact explination, but it might have something to do with the air temp. THe longer tube lets the air cool off more(meaning more dense, more power) than a shorter tube bringing in hot air to the motor faster?
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Old 01-31-2007, 07:23 PM   #40
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Under the same temps as i said.. wird though.. Anyhow i'm not arguing or anything i'm just wondering why this happens. I currently have my custom short intake off my truck and am trying to take a video so i can compare the before and after...
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Old 01-31-2007, 07:33 PM   #41
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I can't believe there are still believers in K&N. Yall believe in the tooth fairy, too?
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Old 01-31-2007, 08:00 PM   #42
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who believes in K&N? Dont make me search the forum just for that one thread with the more data...
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Old 01-31-2007, 09:40 PM   #43
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I don't have an exact explination, but it might have something to do with the air temp. THe longer tube lets the air cool off more(meaning more dense, more power) than a shorter tube bringing in hot air to the motor faster?
the longer tubes provide a more stable airflow to the engine (less turbulence) ... similar to the "tornado" style TB spacers you see on TV ... (they actually do work, but not nearly as well as stated )
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Old 01-31-2007, 10:53 PM   #44
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lol Consumer reports did tests on the Tornado junk.. they installed it on few hundred cars and all didn't get any change in hp nor mpg. They were interviewing the people that made the tornado and they were saying you are selling a product that is just trash and you are ripping people off. The guy is like well they worked on our tests. Then the interviewer again is like but you are ripping people off for an item that does nuthing at all, how can it work on your car and not work on a same cars we have here... and again but it worked on our tests you guys are testing wrong.
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Old 02-01-2007, 12:18 AM   #45
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I can't believe there are still believers in K&N. Yall believe in the tooth fairy, too?
Yeah I have the same feeling. Sure the K&N might help a 5.0L Mustang and some other cars that CAME FROM THE FACTORY WITH A PURPOSELY RESTRICTIVE AIR INTAKE SYSTEM but it won't help performance with a TJ's whose factory air intake system is very non-restrictive, and was designed to be that way.

What is the K&N better at? Letting in more fine dust and silican when it's in dusty conditions.
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Old 02-01-2007, 12:50 PM   #46
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How dissappointing to discover this info after I plunked down my $46.99. Oh well, cheap lesson. Into the toolbox the K&N goes as a spare now, incase I swallow some heavy dust on the trail and want to swap it out for the drive home.

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