On the same hand, they allow the filter to flow more air than paper or foam. There are actually hundreds of microscopic fibers that cross these holes and when treated with oil, capture and hold the very fine particles. Holding the filter to the light is useless, pin holes are normal. The K&N filter achieved the following results: The amount of dust retained by the filter is divided by the total amount of dust fed during the test to determine the Cumulative Efficiency. This weight is compared to the clean element weight to determine the total DustĬapacity. The dirty filter element is then weighed. The test is continued until the pressure drop increases 10" H2O above the initial restriction of the clean element (in this case. The test procedure consists of flowing air through the filter at a constant rate (airflow rate is determined by the application) while feeding test dust into the air stream at a rate of 1 gram per cubic meter of air.Īs the filter loads with dust the pressure drop across theįilter is increased to maintain the prescribed airflow rate. This test is the standard of the air filter industry.
The testing procedure used is SAE J-726 using ISO Test Dust. The "tack" characteristic of a K&N allows for increase filtration without loss of flow as well. To get higher ratings, the foam must be more dense and therefore way more restrictive. Foam is generally the worst media with a typical efficiency rating of 75 - 85%. This test uses particles as low as the 0 - 5 micron range and goes up to 20 microns.įor comparison, a paper filter also stops 99% on the same test and the OEM minimum standard is 96%. They have been proven to stop at least 99% of particles on a SAE dust test. Our filters are tested by an outside, independent laboratory. Most is opinions not based on any sort of factual evidence. One Internet "expert's" opinion is not reason for concern and should be taken loosely at best. If there were any sort of problem, one would think we would know by now and so would everyone else. Furthermore, does he realize that 96% meets OEM standards? K&N has been around for over 30 years and we sell over 2,000,000 units a year.
The difference between 99.2% and 98.1% (his results) is 1.1% not 224% as he states!!! (: who didn't go to school, Jim was measuring the amount of dust that goes inside the engine). Applies only to in-stock items.It is incorrect. *Ships same day unless otherwise noted when you add to your cart. Your K&N Air Filter is backed with a 10-Year / Million-Mile Warranty. Reusing your filter is not only convenient - it's good for the environment, too. It only takes a simple cleaning every 50,000 miles to keep this filter working for as long as you own your vehicle. With a K&N Performance Air Filter under your hood, you'll never have to buy another filter again. This design effectively blocks dust and debris, keeping your engine breathing clean for maximum performance. It features 4-6 pleated sheets of oiled cotton-gauze, held between two layers of aluminum wire.
K&N Air Filters provide nearly unrestricted air flow to your engine, promoting combustion and enhancing your power and acceleration. Bolt one to yours, and you'll see why right away.
This isn't news, either - drivers have turned to K&N to keep their engines breathing for over 30 years. K&N Filters are quite simply the best choice when it comes to engine filtration.