Tru_Blue_104 said:A buddy of mine is going through an auto tech school out in chicago, and told me that a couple of instructors, in fact most of them, dont like K&N air filters. They say its because they are woven or something, i cant quite remember. Has anyone heard anything like this? I'm not looking for advice, just looking to find an alternative.
Ray III said:I think what they don't like is the fact that a DRY K&N filter has next to no filtration capability and particles just slip through the cotton. This is probably also the reason you see such a dramatic improvement when using a parts-store demonstration unit, because the filter is likely DRY and shows far greater airflow than real-life circumstances.
K&N filters, and any other such cotton filter or foam filters, MUST be oiled as regular maintenance. It is the oil and not the filter element that traps dirt. If you were running an all-out race engine, though, and didn't care how long the engine lasted, you could put a dry K&N in there. It will give you almost unrestricted airflow while keeping leaves/debris/small children out.
Your buddy's instructors should try reading the directions sometime.
Pro-Hawk said:This is true
I usualy clean mine once a week, except my 93' Its a PIA to get to.
I should specify, he said that K&N's rob horsepower. I'm gonna talk to him again and get the details. Interesting none the less.
Stinger said:They filter better as they get dirty (as it states in the directions). I've had mine for nearly 2 years and never cleaned it...
Hmm...that's funny because a few TF guys dyno'd their cars back to back and picked up 7-9hp at the rear wheels by just adding the k&n
Stinger
Frumious B. said:Does the instructor hate all oiled-cloth filters, or is it something personal with K&N?
Does he mention using a K&N in the stock air-intake vs using a K&N in a modified intake?
Is it the cone filter he hates, or any filter?
Truth is, oiled cloth does allow more airflow than paper. There are any number of reviews and tests which you can read about with a Google search. However, rarely is the airfilter the most restrictive part of the (stock) intake.
mr_woodster said:K@n does flow and filter better with Proper maintence. If you get gung-ho about oiling the thing, yes your motor will injest some...but not really a problem due to the fact that every motor already eats oil(vapor).
The problem with later model usage of K@N's is the sensitive mass air meters. Becuase there Diodes sit in the main air stream they can be coated with the filter oil and over time, give false/fuzzy readings and cuz need to replaced (read:dead...not cleanable).
If seen it first hand on a 200x ford truck, and heard the same thing from multiple mechanics locally and at the ford dealer.
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