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Old 10-29-2013, 09:44 AM   #1
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Air filters

Is the K&N air filter as superior as they indicate and if so how do I find one for my 2012 Itasca 37F V-10
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Old 10-29-2013, 11:08 AM   #2
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No, it is one of the worst rated air filters for actual filtering ability.
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Old 10-29-2013, 11:15 AM   #3
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I can buy a lot of OEM filters for the same money and don't have to wash and oil them. I am also sure of the filtering properties.
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Old 10-29-2013, 11:45 AM   #4
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All I have read, tells me the K&N filter is not as good as the OEM product. Stands to reason. Why would an engine manufacturer use a sub par filter to protect their engine?
Second, on a MH, one might expect to change filters every couple years at most so what is a hundred bucks or so over two plus years compared to the expense of changing to another system that MIGHT be as good as the OEM.
IMHO, makes no sense.....
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Old 10-29-2013, 12:36 PM   #5
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If all the tests etc rate K&N as the worst filter then why have they been a thriving successful company ? I play in the So Cal deserts in all kinds of vehicles in all kinds of conditions with K&N filters for years with zero problems. All I'm saying is don't be mislead by people who don't want you to buy a certain product but steer you towards theirs. A K&N filter has been on my Motorhome for 12 years and when I take it off the intake area is clean as a whistle.

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Here's my sons 66' Chevelle in K&N's 2014 Calendar . You might think my opinion might be biased but I've used them for years and years before he was even born.
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Old 10-29-2013, 12:45 PM   #6
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There is a lot of discussion on this site: Air filter
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Old 10-29-2013, 12:48 PM   #7
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The K&N's let most of the dust through, which isn't a problem for racing. I used them on my racing motorcycles, but I rebuilt them each season. My MH I want to last, so I won't use a high flow filter like the K&N's, too many tests rate them very low for actual filtering capability.
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Old 10-29-2013, 12:48 PM   #8
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Take all the subjectivity out of the decision. Compare ISO 5011 test results and pick the best filter for your application. Bear in mind, though, the significance of slight differences in filtration efficiency. For instance, if 100 grams of dust are introduced to three separate filters under test with efficiencies of 99.9%, 99.0% and 96.0%, the three filters will allow the following amount of dust to pass into the engine:

99.9% efficient filter - 0.1 gram
99.0% efficient filter - 1.0 gram (10 times as much)
96.0% efficient filter - 4.0 grams (40 times as much)

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Old 10-29-2013, 01:39 PM   #9
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I put a K&N filter on my 2001 Dodge truck the first week I bought it new. I didn't want to keep replacing filters. Today it has 272,000 miles on it and runs like the day I bought it. We live in the country on a gravel road and have to drive one mile from the house to get to black top. I also put one on the DW's Jeep Liberty. I clean and oil them myself on average once every 5-6 months. Success story or just lucky...? They're both diesel engines if that makes a difference? But, based on my experience I'd do it again.
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Old 10-29-2013, 09:10 PM   #10
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Diesel engines are very sensitive to dust in the air intake. I have done many hours of research on this subject. K&N has conducted a great advertising campaign. In gas engines there is no problem but this is not true for DPs.

I use a Racor filter on my DP. According to a email exchange I had with them the shelf life of their filters is about 3 years and the service life depends on driving conditions and could be upto 5 years.

My advice is, don't go with K&N. Dusting a diesel is an expensive thing to do just for the sake of an air filter.

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Old 10-29-2013, 09:30 PM   #11
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The results of this ISO 5011/SAE J726 air filter test are very informative. I bought a K&N for my 1996 Dodge CTD.
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Old 10-30-2013, 05:43 AM   #12
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Quote:
Originally Posted by Ray,IN View Post
The results of this ISO 5011/SAE J726 air filter test are very informative.
It's my understanding that a EFI engine that is operating in the closed loop portion of the fuel map, that is not wide open, uses the O2 sensor to keep the fuel mixture correct for the demand. In this case, more air doesn't get you more fuel anyway. I'm not sure more air equals more fuel at WOT either, unless fuel is a direct function of mass flow.

In a Diesel engine more air doesn't equal more power unless you add fuel. There is almost always more air than is needed to burn the fuel added anyway.

With the info that is contained in the ISO 5001 test plus knowing the above, what would be the value of a higher flow air filter that passes more dirt in a non racing application?
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Old 10-30-2013, 08:33 AM   #13
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Originally Posted by Ray,IN View Post
The results of this ISO 5011/SAE J726 air filter test are very informative. I bought a K&N for my 1996 Dodge CTD.
I don't understand your enthusiasm for K&N. It is the worst or next to worst filter of those tested. As I said earlier in summation. Don't sacrifice quality for convenience on a diesel. The risk of damage is not worth the cost of repair and downtime on your DP. As good as many think Amsoil is, I won't even risk my equipment to it. I use Royal Purple. Maybe I am just a fanatic.
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Old 10-30-2013, 12:48 PM   #14
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As a point of interest the OP said he has a 37F V-10 gas engine. I don't use a K&N on the DP, but I haven't had any problems using this filter on the other two diesels. Also, using the K&N air filter did not void the warranty on either the Jeep or the Dodge.
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