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  #11  
Old 07-12-2011, 03:28 PM
elippse elippse is offline
 
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I made my own out of a re-sized hair spray can. It didn't work well until I brought in cool outside air to blow on the vapors from the breather inside the separator. This cool air condenses-out the vapors and returns the oil to the crankcase, with absolutely no oil at the breather output.
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  #12  
Old 07-12-2011, 11:26 PM
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Snowflake Snowflake is offline
 
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Quote:
Originally Posted by asav8tor View Post
-oil mist mixed with, water, water vapor, acids and other products of the combustion process.
Most of the water vapour will exit as vapour through the overflow tube on the air/oil separator. That's what it's for, to separate the air (or vapour) from the oil.

All of your oil has water and acids and combustion by-products in it, not just the oil that gets up near the breather. You lose only a small percentage of your oil through your breather (in fact, in the ideal case, you lose none), and the by-products are an even smaller percentage of that small percentage. So you're not getting rid of much in the way of by-products by leaving your breather as a simple tube.

The breather is an overflow only... It's not an "exhaust pipe" for your oil system.
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  #13  
Old 07-13-2011, 10:53 AM
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Janekom Janekom is offline
 
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Sorry for the slight hi-jack, but a factor to consider is how much oil you are putting into your engine. A lot of owners will over fill.

We once had a Lycoming rep over here ( South Africa ) and his advise was to to fill say to 8 qts on a 360 and then fly it to the point where it seems to stabilize. This should be between 5 and 6. Then keep the level right there in future.

On our 10 I also find that there are a few drops running down the exhaust after shut down, but not too much oil on the belly. Have to clean it every 10 hours or so.

On the 2 seaters playing a bit and being upside down sometimes, seem to produce a bit more oil on the belly.
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  #14  
Old 07-13-2011, 09:54 PM
asav8tor asav8tor is offline
 
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Quote:
Originally Posted by Snowflake View Post

The breather is an overflow only... It's not an "exhaust pipe" for your oil system.
Not correct. It is an exhaust pipe for the oil system. Plug it and watch the pressure build and blow the front seal out of the engine.
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  #15  
Old 07-14-2011, 07:26 AM
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Snowflake Snowflake is offline
 
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Point taken, exhaust pipe was a bad analogy. But air/oil separators have overflow tubes too, to prevent pressure buildup and to allow vapours to escape.
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  #16  
Old 07-14-2011, 07:48 AM
David-aviator David-aviator is offline
 
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Seems like if the breather hose exit is near and on top of an exhaust pipe, problem over.

I've use separators, they are a pain in the butt to maintain.
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