I tried all sorts of things to eliminate oil on the belly of the 185, including all you've mentioned. The best was a homemade air-oil separator which returned the oil to the sump.On my C180, I kept the standard aluminum breather tubing back to where it goes through the aft engine baffling, then went to rubber hose back to & down the firewall.
Then back to aluminum tubing at the bottom to incorporate a whistle slot.
It stops about even with the bottom of the firewall, or just below.
After reading stewart's post on the linked thread, I might shorten it up just a whisker--
maybe get less oil on the belly that way.
Very nice!!Experimental cub… I just reworked mine. CNC’d some brackets that hold it to the firewall. Still have to cut the whistle slot but it’s been sitting and hasn’t done much flying this winter due to other issues!
View attachment 68283
View attachment 68284
Van's has been doing that on the RV's for many years.Just a thought............what if you had the breather cut short and drip oil onto the exhaust. Shouldn't be much different than a smoke system.
Just replaced the rubber hose on mine with it tube.View attachment 68286View attachment 68286
I had one freeze over and blow out the dipstick in 1/2 an hour. After that happened, an AD note came out to install the whistle hole. The nose seal didn't move. Doesn't make sense, but the dipstick did unscrew and blew out with such force I heard it hit the cowl on a Colonial C-1. The tail was covered with oil.All it takes is an hour in real cold to start that process. And unless it's melted or removed between flights it just keeps on building up until.
Gary