Join Date: Sep 1999
Location: Casa Grande, AZ
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Re: Cleaning a K&N Air Filter
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I have to admit that is the first bit of negative feedback I have ever heard when it comes to running a K&N on your daily driver. I love mine.
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Do some simple math... if you are going to use K&Ns you will need to buy two filters (or wash, clean, wait for it to dry, then oil to replace it). As an example my 22R stock replacement filters are about $4.00 each. The K&N replacement is about $35.00 each. I buy two, plus a $10.00 can of spray oil.. that's $80.00. For $80.00 I can buy 20 paper filters, if I change filters twice a year, that 10 years worth of filters!! I don't have to waste 10 to 15 minutes to wash the filter, wait 3 or 4 days for it to dry, take 1 minute to spray it, let it soak for a couple of days, then reinstall it on my vehicle.
K&Ns claims to go 50,000 miles without cleaning it. Does any normal person really think that an air filter used in average conditions, such as a daily driver, (oil soaked or paper) can go 50,000 miles without it getting clogged??? I change my air filters every 6 months or about every 10K miles. If I'm off-roading and in dusty conditions, I change the air filter every 5,000 miles or less.
Now regarding K&Ns own formula for the amount of Area needed to filter:
A=CID x Max RPM divided by 20,839. A stock 22R filter is about 72 sq. inches. K&Ns formula says that my engine only needs about 33 sq. inches of filter area, so the stock filter is more than twice the amount I need according to K&Ns formula. So, where is the ecomonics or any other benefit come from using a K&N filter in a daily driver???? Again, I have never seen any certified dyno test data to prove that a K&N filter replacing a stock filter on a stock engine will make more power!! Making power with fuel economy and compliance to federal and state emissions laws is expensive for any auto manufacturer. Wouldn't you think that if they (Toyota engineers, and all other auto makers) could make more HP by simply designing a "bigger" air filter, or soaking it with oil, they would do it!!!!??? That's just my humble opinion.