- Aug 23, 2007
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My friend put a cold air intake in her girlfriend's Mini so I'm trying to convince her not to use a K&N filter... So I Googled to see if there has been any change in public awareness about the crappiness of their filters. Apparently not but I did find their FAQ http://www.knfilters.com/faq.htm#24
24. More airflow means you are letting more dirt through, right?
No. Filtration testing measures the percentage of dust retained before the filter reaches a terminal test pressure, often 10" of restriction above initial restriction. We use airflow as a simplified term to explain a more complicated physical process. The more precise description is restriction: K&N air filters create less restriction which helps an engine run better. An engine will only use the air it needs and our air filters do not result in an engine using more air than necessary. Rather, they result in the engine experiencing less restriction. The terms airflow and restriction are inversely related. Our air filters provide either less restriction at a fixed airflow rate; or more airflow as a fixed level of restriction. In neither case is more air being used than necessary.
Notice how they didn't even address the question at all. Instead they say "our filters don't flow more air than necessary".
For reference: http://forums.nicoclub.com/debunking-the-k-n-myth-why-oem-is-better-t180100.html
http://www.bobistheoilguy.com/airfilter/airtest3.htm
Also for reference, the thread where a K&N rep posted claiming "misinformation" but without actually addressing the issue of poor filtration: http://forums.anandtech.com/showthread.php?t=2040364
24. More airflow means you are letting more dirt through, right?
No. Filtration testing measures the percentage of dust retained before the filter reaches a terminal test pressure, often 10" of restriction above initial restriction. We use airflow as a simplified term to explain a more complicated physical process. The more precise description is restriction: K&N air filters create less restriction which helps an engine run better. An engine will only use the air it needs and our air filters do not result in an engine using more air than necessary. Rather, they result in the engine experiencing less restriction. The terms airflow and restriction are inversely related. Our air filters provide either less restriction at a fixed airflow rate; or more airflow as a fixed level of restriction. In neither case is more air being used than necessary.
Notice how they didn't even address the question at all. Instead they say "our filters don't flow more air than necessary".
For reference: http://forums.nicoclub.com/debunking-the-k-n-myth-why-oem-is-better-t180100.html
http://www.bobistheoilguy.com/airfilter/airtest3.htm
Also for reference, the thread where a K&N rep posted claiming "misinformation" but without actually addressing the issue of poor filtration: http://forums.anandtech.com/showthread.php?t=2040364
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