K&N Air Filter

[dtgunner7]

Has anyone used the K&N air filter on there Diesel pusher, have read positive and negative on these air filters. Supply houses want almost the same price for stock replacement as K&N wants for a clean able filter...

[Blaster_Man]

When in doubt use OEM, can't go wrong there.

[dtgunner7]

Yeah, This filter is a dry filter. NO OIL!!!!! Just trying to find a good filter as I stated the OEM and cross ref., now cost almost as much as the K&N.. Thanks all for info....

[bluwtr49]

sh410 wrote:

427435 wrote:
With computer controlled, fuel injected engines, more air does not equal more mpg. Maybe more hp, but not more mpg. The MAF sensor senses more air and the computer injects more fuel. At anything other than wide open throttle, the throttle (not the air cleaner) is controlling air flow.

The other thing that the K&N style filters do is allow more intake noise and, walla, the butt dyno indicates more power.

This true of gas engines but not true for diesel power.

It looks like posters lost track of the OP question where he was specific about experiences with DP applications and off we go with info not relevant to the topic.

[sh410]

427435 wrote:
With computer controlled, fuel injected engines, more air does not equal more mpg. Maybe more hp, but not more mpg. The MAF sensor senses more air and the computer injects more fuel. At anything other than wide open throttle, the throttle (not the air cleaner) is controlling air flow.

The other thing that the K&N style filters do is allow more intake noise and, walla, the butt dyno indicates more power.

This true of gas engines but not true for diesel power.

[dodge_guy]

And yet there are millions sold, but only a very small percentage that claim a failure. And I'm sure of those failures there were other existing problems!

[427435]

With computer controlled, fuel injected engines, more air does not equal more mpg. Maybe more hp, but not more mpg. The MAF sensor senses more air and the computer injects more fuel. At anything other than wide open throttle, the throttle (not the air cleaner) is controlling air flow.

The other thing that the K&N style filters do is allow more intake noise and, walla, the butt dyno indicates more power.

[sh410]

If it will allow more air into the engine (breath better), how does all that air get out the standard exhaust. So in addition you have to upgrade the exhaust to take advantage of the additional air intake.

Magnets on the fuel line would be a better investment.

[Monaco_Montclai]

The only thing I have found with the k n filters , is they are reusable , take them out and do the wash out thing,soap and water, and more air flow, so maybe more gpm. Now it's all happy-camping

[427435]

dtgunner7 wrote:
Hey 427435 thanks for some good information, any idea how old this group of tests was. The filter I am just looking at is new on the market as of last year...

The test is getting old, but the physics hasn't changed. If there is a better way to filter air, the OEM's would be using it.

[RCMAN46]

Take K&N and hold it up to a bright light. Compare to a standard dry paper filter. Then you will understand why the oil filter does not filter as good as a dry paper filter.

[hershey]

If you take 42837's feed back further and google K&N filter comparisons testing you will find that it fails in every comparison test you find. Not only fails, but is at or near the bottom of the list in every case.
I don't understand it, the oily filter should stop dust and dirt better than a dry filter, but it doesn't.

[LVJ58]

Well, for whatever it's worth, probably not much, but back in 2005 had a Banks system installed which included an air intake using the K&N filter.

Ten years later still have it, and, with 94k miles on coach, so far no negative issues or damage to MAF sensor.

I would stipulate that if over oiled the sensor could possibly be contaminated resulting in faulty data input to the PCM.

Best regards & safe travels to all...:)

[randallb]

dt,
Nothing has changed in a K&N filter, other than applications, since they came out.
Randy

[dtgunner7]

Hey 427435 thanks for some good information, any idea how old this group of tests was. The filter I am just looking at is new on the market as of last year...

[crasster]

I would not use one. The point of an air filter is to filter the air from small (or even large) foreign bodies. They may say they "breathe easier", but if you consider the overall size of the filter and compare it to the air intake tube, it is usually MUCH larger. This is because the filter has a larger surface area than the area of the circle of the intake. So it breathes from a "larger area" to a smaller area, and the "breath" is filtered. Hence it should go pretty unrestrained once into the intake.

The K&N stuff I don't want to debate about, but I'd agree with the post above about "snake oil".

However if you are looking at more MPG's, there is an oil called "Marvel Mystery Oil", that often people look at and think is snake oil. I can give actual testimonial of my own that it increases MPG's in both my home vehicles, my children's go-karts, my lawn equipment runs longer, My Class C (pictured below) gets better MPG, and my class A bounder gets better MPG when using that stuff. A bit in the oil and fuel. For Diesels read up on their site about the use. Really it's a high detergent with a kick.