It is common practice in many amateur-built engine installations, from Rotaxes to Lycomings, to use K&N filters. They do a wonderful job of filtering the air, and they are reusable. However, they only are able to perform correctly if they are properly cared for. They should be cleaned annually at a minimum with K&N filter cleaner and then lightly oiled with K&N filter oil. Without the oil, which leaves a slight pink color on the filter, they will not filter properly. The one in the photo above was not oiled.
In Case You Missed It
Completions
Fernando Courreges' SonexMy Sonex took to the air for the first time on...
What’s New
World Aircraft Company debuts the Vision LSA, and Velocity Aircraft introduces the V-Twin.
Cowl Paint Protector Bib
The top photo shows a "bib" I fabricated out of a shower pan liner....