snopercod
Well Known Member
Ever since my first flight in 2014, my oil analysis has come back "high silicon". The standard response has been "Your air filter sucks". It's a K&N, which is known to let more "stuff" through than some others, but I just didn't believe the filter was at fault because I don't fly off of dirt strips or in sand storms. So I ran an experiment. I had originally vented my crankcase with silicon rubber coolant hoses which ran to an oil separator, the drain of which was plumbed back to the crankcase with more silicon rubber hose. At the last annual back in August, I re-plumbed the system so the separator drain went to a little catch bottle rather than back into the crankcase. Wonder of wonders, the latest silicon reading went down from the 30-35 range to 14 this time. I'm calling "problem solved".