Oil separators

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maxmotoring
Posts: 28
Joined: Sun Sep 18, 2011 9:28 pm

Oil separators

Post by maxmotoring » Tue Nov 29, 2022 9:59 pm

What is the general thinking regarding best practice relating to oil separators used on aircraft? Is it acceptable to route the collected oil back into the sump, or are there good reasons not to? Discuss! All opinions welcome.

Thanks, David
David Elliott

mike newall
Posts: 330
Joined: Mon Jan 28, 2008 2:56 pm
Location: N Yorkshire

Re: Oil separators

Post by mike newall » Sat Dec 03, 2022 10:19 am

It depends on what you are doing with the aeroplane.

If you are using it for aeros and the separator is in constant use, then you would normally return the oil to the sump.

If it is tourer and the sep fills over a period of time, I would likely dump it as you will have gunk and crud in there from condensation.

We have an Andair separator in the RV7, it gets plenty of use and returns to the sump. It also has a condensation trap which gets emptied manually every couple of months - that is usually full of milky crud.
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maxmotoring
Posts: 28
Joined: Sun Sep 18, 2011 9:28 pm

Re: Oil separators

Post by maxmotoring » Sat Dec 03, 2022 1:02 pm

Thank you Mike, it seems then that it is best not to put it back in the oil tank, so I’ll route it to a collector tank for removal periodically. The engine is a Walter Mikron that tends to breathe a lot so I was hoping to not lose too much oil by recycling. Aeros will not be performed. Looking at the Aircraft Spruce Catalogue, there are many separators for sale so was influenced by that into thinking it would be a good idea!
David
David Elliott

mike newall
Posts: 330
Joined: Mon Jan 28, 2008 2:56 pm
Location: N Yorkshire

Re: Oil separators

Post by mike newall » Tue Dec 06, 2022 6:06 pm

Andair is fine, and British.

What aeroplane ?
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maxmotoring
Posts: 28
Joined: Sun Sep 18, 2011 9:28 pm

Re: Oil separators

Post by maxmotoring » Wed Dec 28, 2022 10:44 pm

Chilton
David Elliott

mike newall
Posts: 330
Joined: Mon Jan 28, 2008 2:56 pm
Location: N Yorkshire

Re: Oil separators

Post by mike newall » Thu Jan 05, 2023 3:41 am

As you said, do not return to the sump.
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