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04-25-2014, 01:39 PM
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Join Date: Jan 2005
Posts: 3,646
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Mike Busch's thoughts on oil separators
Just got this article about oil separators in a Mike Busch newsletter I regularly receive. Seems he doesn't like them. Coincidentally, I happen to have an un-installed anti-splat kit ready to get put on. Hmm... Anyone know if the Anti-Splat ones mitigate any of the problems he mentions?
http://us5.campaign-archive1.com/?u=...7&e=1db3de8610
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Steve M.
Ellensburg WA
RV-9 Flying, 0-320, Catto
Donation reminder: Jan. 2021
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04-25-2014, 01:48 PM
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Join Date: Oct 2007
Location: Salmon Arm, BC
Posts: 933
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Seems what he doesn't like is the idea of putting the "effluent" back into the engine. If I understand the Anti Splat device correctly the effluent gets burned through the exhaust. The Andair device comes with a little container that can be installed where it is accessible without decowling, and the "effluent" goes there. This is what I have installed on my Rocket - not yet flying (awaiting final inspection).
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Mark Olson
1987 RV-4 Sold
2003 Super Decathlon - Sold
F1 EVO Rocket, first flight May 31/14
First in line for the Sonex JSX-2T kit
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04-25-2014, 02:07 PM
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Join Date: Jan 2005
Location: SC
Posts: 12,887
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I'm in the process of writing an article regarding air / oil separators for publication in a future issue of KitPlanes.
My research indicates that there are as many opinions on using an air oil separator as there are people.
What I'm struggling with is finding true facts on if they are a good or bad thing.
Pouring a bunch of stuff on the ground doesn't neccissarly mean anything and based on the design of the separator, that water (?) could be burned off, captured, or returned to the engine.
One person I interviewed mentioned that there are a number of certified airplanes with separators installed at the factor and there are STC's to retrofit them. If they were so bad, why would this be allowed? - Interesting point.
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Bill R.
RV-9 (Yes, it's a dragon tail)
O-360 w/ dual P-mags
Build the plane you want, not the plane others want you to build!
SC86 - Easley, SC
www.repucci.com/bill/baf.html
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04-25-2014, 02:29 PM
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Join Date: May 2005
Location: Tuttle, Oklahoma
Posts: 2,563
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Quote:
Originally Posted by N941WR
If they were so bad, why would this be allowed? - Interesting point.
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To make money!
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04-25-2014, 02:45 PM
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Join Date: Aug 2011
Location: PORT ARANSAS
Posts: 419
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I put an air/oil separator on the Lycosaur O-540 in our last airplane. We installed it when we rebuilt the engine, because I liked the idea of having a clean belly.
The old graybeards on the field scoffed at me for doing so. One of them laughed and said "Son, your aircooled engine has 15 different potential sources of oil on the belly. You just spent a lot of money to cure one of them."
At the time I thought "What a rube!". However, in retrospect I have to admit that he was right. As the engine aged (we flew it for 12 years and 1400 hours) it sprouted a drip here, and a seep there, and -- like an old Harley, it began to mark its territory. The expensive air/oil separator, once effective at keeping the belly clean, ultimately became something of a joke.
I'm not planning to put one on our -8A.
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Jay Honeck
RV-8A N14EG
Port Aransas, TX
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04-25-2014, 02:56 PM
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Senior Curmudgeon
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Join Date: Sep 2005
Location: Dayton Airpark, NV A34
Posts: 15,420
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Quote:
Originally Posted by jjhoneck
I "Son, your aircooled engine has 15 different potential sources of oil on the belly. You just spent a lot of money to cure one of them."
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Just a thought here, but I wonder....................
How much would the other 14 locations leak if the crankcase was under vacuum as happens with the vent line attached to the exhaust ???
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Mike Starkey
VAF 909
Rv-10, N210LM.
Flying as of 12/4/2010
Phase 1 done, 2/4/2011 
Sold after 240+ wonderful hours of flight.
"Flying the airplane is more important than radioing your plight to a person on the ground incapable of understanding or doing anything about it."
Last edited by Mike S : 04-25-2014 at 02:59 PM.
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04-25-2014, 02:58 PM
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Join Date: Mar 2005
Location: DVT Phoenix
Posts: 1,187
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I installed an AS oil sep on my 7 20hrs ago and the oil on the belly is no longer a problem. About the stuff that is returned to the engine---A friend installed a reservoir to catch the return oil out of the separator on his lycoming and it amounted to several table spoon fulls between oil changes and did not look contaminated (at least not like the video showed). I'm sure it was to an extent but looked harmless to a mechanic of 50 years. I am happier with the separator than not and will leave it on. Just sharing an experience. :-) Larry
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04-25-2014, 03:06 PM
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Join Date: Jan 2005
Location: Yorkshire, England
Posts: 2,052
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We have an Andair separator with the extra gob catcher.
It was set too low initially - I just used someone elses placement. We got lots of oily belly when doing hammerheads and slow rolls.
After moving it higher, I can now do vne to vertical and stay until I run out of airspeed - not a drop.
The catcher gets cleaned every oil change and the milky stuff is thrown away.
Unless you put a half Raven or full system in, I really think that these do work well and certainly the Andair is beautifully crafted.
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"I add a little excitement, a little spice to your lives, and all you do is complain!" - Q
Donated in 2020
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04-25-2014, 04:49 PM
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Join Date: Oct 2007
Location: Sacramento, CA
Posts: 3,351
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Quote:
Originally Posted by mike newall
We have an Andair separator with the extra gob catcher.
It was set too low initially - I just used someone elses placement. We got lots of oily belly when doing hammerheads and slow rolls.
After moving it higher, I can now do vne to vertical and stay until I run out of airspeed - not a drop.
The catcher gets cleaned every oil change and the milky stuff is thrown away.
Unless you put a half Raven or full system in, I really think that these do work well and certainly the Andair is beautifully crafted.
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Do you have a picture of your mount location or at least a good description of how high or where?
Thanks
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Mehrdad
N825SM RV7A - IO360M1B - SOLD
N825MS RV14A - IO390 - Flying
Dues paid
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04-25-2014, 09:44 PM
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Join Date: Jul 2007
Location: Delta, CO/Atlin, BC
Posts: 2,391
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After trying to make several different separators work properly, I just ended up running my breather tube into the exhaust pipe at 90 degrees and the excess burns off. I thought it was going to be an issue with extra suction pulling oil out of the crankcase, but I typically run about 25 hours before having to add another quart of oil, so I'm happy with this setup. No oil on belly.
Greg
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Greg Arehart
RV-9B (Big tires) Tipup @AJZ or CYSQ
N 7965A
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