Mounting a Sonex air-oil separator after the build

Firewall Forward Aerovee
1

Hey all,

Initially I had no air-oil separator. Later I bought one from amazon and modified it. It helps, but it’s really small and not perfect. With the additional power from my mods, we have been turning 3250 RPM in cruise and seeing 120 kts. But the extra RPM seems to sling more oil out the breather, protecting the belly from corrosion. So, I bought the one that Sonex sells. This would be easy to mount during construction. 4 holes with nutplates in the firewall, two of the up high in front of the tank, and you are set. So I came up with a scheme to mount aluminum extrusions to the motor mount with adel clamps, and mount the separator to them.

Screenshot_20260131-154011
Screenshot_20260131-1540111080×596 206 KB

4 Likes
2

That’s how I originally installed the Rotax oil tank and it worked well. I am sure the Rotax tank would be similar to the oil separator in size and weight.

I later had to relocate it to accommodate my cooling system mods and installed it on the firewall which wasn’t very difficult at all.

I might have to relocate it yet again because I am switching to the Ring mount, hoping I lucked out though and installed it out of the way

1 Like
3

Bryan: How do you stop the pliers and spark plug from rattling around when you are flying?

Ron

4

You just have to constantly pull a bunch of G.