Anticept Posted September 7, 2016 Report Share Posted September 7, 2016 K&N air filters are used on a lot of aircraft, not just LSAs. However, old habits die hard as people clean them every chance they get. Here's the thing about K&N filters though: They work better when they are a little dirty due to the way the oil coating works. They should not be cleaned at every single interval! I'll let K&N's own page show you when to clean: http://www.knfilters.com/cleaning-pics.htm. I wouldn't wait until it's THAT dirty, but don't panic just because it has some dirt specs. It's also important to treat the filter properly. DO NOT USE COMPRESSED AIR DIRECTLY ON THE FLUTES. You will damage the filter's tiny filaments. If I have to, I'll blow the air at a flat angle parallel to the flutes to dislodge large debris. Usually the rinse gets everything though. Here's K&N's instructions on cleaning and re-oiling the filter: http://www.knfilters.com/cleaning.htm Finally: if the filter shrinks and is really hard to put on, use a heat gun or submerge the filter ring (NOT the filter element, just the end) in boiling water. It will soften the rubber a lot and expand a surprisingly large amount. I occasionally have to do this to get a filter on. They should just slide right on after doing this and when they cool, take the shape of the flange they are mounted on, so you shouldn't need to do this every single time. Also: do NOT over oil the filter! This is especially true for any engines that have some sort of air flow or mass air sensor. K&N oil is rumored to damage those sensors and it's still an ongoing controversy. Still, K&N specifically says do NOT over oil the filters! (@ http://www.knfilters.com/filter_facts.htm) Over-oilingWhen servicing a K&N filter, take care not to over-oil the element. Besides impeding air flow, excess oil can migrate into the intake system where it can coat electronic sensors, which some OEM's claim may hinder the sensors' operation and result in a repair that will not be covered under warranty. Although K&N disagrees with such claims, as explained in more detail on the Mass Air Flow Sensor page of web site, in order to avoid a dispute with an OEM over the denial of a warranty claim, we suggest that you be careful not to over-oil your K&N air filter. Never saturate the filter. If oil drips from the filter, wash it and start over. Use only K&N oil. For example, an E-1500 filter has 92.4-inches of surface area requiring 1.707 fluid ounces of oil. Follow oiling instructions included with your filter or refer to the K&N Air Filter Cleaning Instructions. Link to comment Share on other sites More sharing options...
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