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KN air filter

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Coloken

10-12-2007 19:06:47

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Friend with Ford diesel pickup asked me if these K&N reuseable air filters are any good. I Said I would ask the experts.

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RayP(MI)

10-13-2007 17:10:26

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Re: KN air filter in reply to Coloken, 10-12-2007 19:06:47

I have two identical Chevy Blazers, one with, one without. Can't see any difference in the fuel economy. One of these days, I'll probably pick up a OEM and go with that.

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ed19

10-13-2007 10:43:15

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Re: KN air filter in reply to Coloken, 10-12-2007 19:06:47

Did you know that if the engine goes out and you put it in the shop with one of these still sitting on it the warranty is voided.

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Jon Hagen

10-13-2007 10:33:27

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Re: KN air filter in reply to Coloken, 10-12-2007 19:06:47

Notice that even the cheapest throw away Briggs lawn mower engine has discarded the oil wetted air cleaner in favor of a pleated paper filter ? The auto industry abanoned that pathetic oil wetted filter design in the 1930's. Why would you want to risk damage to a $40,000 pickup engine with junk like that ?

I made the mistake of believing a relative that was selling oil wetted air filters, and installed one on our old V8 rock hauler truck.
We wiped the rings out of that engine in two days running in very dusty conditions. So much dirt had gotten through that miracle filter that the choke plate was loaded with oily mud.

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rustyfarmall

10-13-2007 07:56:31

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Re: KN air filter in reply to Coloken, 10-12-2007 19:06:47

Take a good look at the box that the stock filter is located in. You may be able to modify and open up that box to allow better air flow while still maintaining the original filter. You might be able to increase the miles per gallon AND the performance without spending a dime.

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Dean Barker

10-13-2007 07:49:38

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Re: KN air filter in reply to Coloken, 10-12-2007 19:06:47

There was a report of an SAE air filter test on the tool section of this forum awhile back. This test used air filters that fit a Chevrolet Duramax engine. Basically, there was very little gain in air flow using a K&N over a AC Delco, but the K&N let thru 44 times as much dirt and plugged up twice as fast. Similar reuseable air filters showed similar results.

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Luke S

10-13-2007 06:46:45

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Re: KN air filter in reply to Coloken, 10-12-2007 19:06:47

There is only one way to flow more air through the same size intake, and that is to not filter the air as much. Even if you gain 1 mpg, I don't think it is worth the risk of letting more dirt into your engine. But I am old fashion. I only run OEM filters on everything I own.

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Coloken

10-13-2007 06:08:59

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THANKS in reply to Coloken, 10-12-2007 19:06:47

Thanks for all the feed back Kennyp

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John M

10-13-2007 04:48:43

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Re: KN air filter in reply to Coloken, 10-12-2007 19:06:47

K&N is a good filter, but not for that truck, dont let him put it in there, unless hes going with an FIPK of something similar. The K&N will not seal well in the factory box.Dozens of deisel vendors are selling the same type filter but different colors and names, but all will tell you to use their pipes and not the factory box. I have been using the Donaldson kit that Ford approves and sells.Im happy with it.

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Fawteen

10-13-2007 04:42:23

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Re: KN air filter in reply to Coloken, 10-12-2007 19:06:47

K&N: Krap & Noise

Advertising bull$h!t for kids who think louder is faster.

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kyplowboy

10-13-2007 04:25:28

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Re: KN air filter in reply to Coloken, 10-12-2007 19:06:47

This is one of those thangs I have only herd of one time but I know a guy that the K&N did not work well in a diesel. He had a mid 90s ford, had a local out fit install a K&N kit on it. Seems like there was more too it than just the filter, been a while. Less than a year later they were putting his new engine in for him. Some how enough dust got in/around that thing that it done it in. He got a new engine out the deal but I have never wanted one after hear'n his when it started knock'n.

Dave

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Mathias NY

10-13-2007 02:54:37

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Re: KN air filter in reply to Coloken, 10-12-2007 19:06:47

Ditto the dust concerns, maybe not a good idea for a turbo. Given that the turbo forces air into the engine, improving airflow is probably not a benefit anyway. I have heard that a clean K&N is actually a bad thing, the more dirt caught by the filter the better it works. There are other brands out there too, AirRaid is one of them.

I have been running a K&N in my Ram 1500 for 3 years now and am quite happy with it, about 1mpg increase. It is my understanding that the better air flow comes from double (or more) surface area of the filter, basically more pleats.

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Silver Pig

10-13-2007 01:51:33

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Re: KN air filter in reply to Coloken, 10-12-2007 19:06:47

They are basically the same as the oiled foam air cleaners that are used in lawn mowers.
Since the company basically gears its advertising to "off roaders" and hot rodders, who are basically junior high or high school kids, I would be extremely suspect as to either the quality of their products, or the claims made about the 'advantages' of useing the product.
If the product was as benficial as they would have you believe, why doesn't any manufacturer use them as OEM?

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RusselAZ

10-12-2007 21:33:45

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Re: KN air filter in reply to Coloken, 10-12-2007 19:06:47

If you don't drive it in dusty conditions a KN is OK. Otherwise, leave them on the shelf and NOT in a turbo pickup. I have some pictures at the shop of dust and impeller damage because of poor filtering. Expensive.

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JD9295

10-12-2007 21:05:46

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Re: KN air filter in reply to Coloken, 10-12-2007 19:06:47

i ran them until i saw a independant test done on them.
yes they get more air flow and perhaps a few mpg better, but when i saw what did get through them i took them out.
theres alot more that gets by than you think

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RodInNS

10-12-2007 20:07:15

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Re: KN air filter in reply to Coloken, 10-12-2007 19:06:47

I tend to believe that if you're hoping to put more air through the same size hole, you have to do it faster..... so you reduce restriction. What stops the dirt now? I don't think that K&N has some magic technology; just a compromised filter from a filtering standpoint. Engineering is always a tradeoff.....

Rod

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RobMD

10-12-2007 19:40:09

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Re: KN air filter in reply to Coloken, 10-12-2007 19:06:47

yeah, about 1 1/2 or 2 mpg expected. I ran mine in my ford ranger pickup for about 35,000 miles and i've only cleaned it twice. When you clean it, you bathe it in soapy water, thoroughly rinse, and let completely dry. Then you are supposed to 'charge' it, in which i just liberally spray a light lubricating oil all over it.

DON'T use them in dusty dirt roads all the time, or it will get choked up faster.

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Buster

10-12-2007 19:18:20

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Re: KN air filter in reply to Coloken, 10-12-2007 19:06:47

I put one on my wifes Jeep Liberty, it gained about 2 mpg.

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TyTX

10-12-2007 19:12:15

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Re: KN air filter in reply to Coloken, 10-12-2007 19:06:47

They are good because they do a good job of filtering the air and don't restrict the air-flow while doing it.

I've put them on several vehicles but as to the stories of radical fuel savings.... Let's just say that neither the RV nor Suburban have shown any noticeable improvement.

I still like K&N filters though.

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