Roger wrote:

On Thu, 16 Jun 2005 12:32:19 -0400, xyzzy wrote:


wrote:


As I understand it, the only benefit of an air/oil separator is to keep the
belly of the plane clean. In reality, what it does is concentrate all the nasty
water and acids the plane normally produces as combustion byproducts and send it back
into the engine. I wouldn't install one on my plane for this reason... even though
it's got a dirty belly.


Interestingly, the upcoming Aviation Consumer has an article on this.
According to their web teaser it looks like they agree with you, but my


If that is their conclusion I'm afraid I won't miss the publication.

I have one of the Deshannon Air oil separators on my Deb and the oil
stays quite clean until 15 or 20 hours. All that *stuff* boils at a
lower temp and does not seem to collect. Beside that I have never had
to add oil except during the breakin for new rings (It had soft rings)

Currently at 25 hours The oil isn't down hardly far enough to measure.

Yes, I have a wet pump so without the air/oil separator it'd be a real
mess.

They said if you have a wet pump then it's a good idea.