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Slime Fighter

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kearney

Joined: 20 Sep 2008
Posts: 563

Posted: Sun Mar 01, 2015 5:42 pm Post subject: Slime Fighter

Hi



I am wondering if anyone has any experience with the Slime Fighter air/oil separator. I have 9 hours on my new engine and am starting to see some thin oil smears on the belly. When I had my Subie, I used a "Homebuilders  Engine Crankcase Oil Breather" but I am concerned that the inlet vent tube is a bit smaller than the hose used on an IO540.



Any comments?



Cheers



Les

C-GCWZ (flying again)

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Dave Saylor

Joined: 11 Jan 2015
Posts: 207
Location: GILROY, CA

Posted: Sun Mar 01, 2015 6:03 pm Post subject: Slime Fighter

Les,



I think you'll see more oil on the belly during break-in than any other time.  That might explain some of it.

For my plane, if I run with more than 9 qts it pumps some out the breather.  If I let the level float between 8 and 9 qts, the belly stays clean enough that it just takes a quick wipedown every 100 hours or so.

I usually see a few drops dripped onto the exhaust pipe on preflight.

--Dave

On Sun, Mar 1, 2015 at 5:42 PM, kearney <kearney(at)shaw.ca (kearney(at)shaw.ca)> wrote:

[quote]--> RV10-List message posted by: "kearney" <kearney(at)shaw.ca (kearney(at)shaw.ca)>

 

 Hi

 

 I am wondering if anyone has any experience with the Slime Fighter air/oil separator. I have 9 hours on my new engine and am starting to see some thin oil smears on the belly. When I had my Subie, I used a "Homebuilders  Engine Crankcase Oil Breather" but I am concerned that the inlet vent tube is a bit smaller than the hose used on an IO540.

 

 Any comments?

 

 Cheers

 

 Les

 C-GCWZ (flying again)

 

 

 

 

 Read this topic online here:

 

 http://forums.matronics.com/viewtopic.php?p=438862#438862

 

 

 

 

 

 

 

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_________________
--Dave
KWVI

flying-nut(at)cfl.rr.com
Guest

Posted: Sun Mar 01, 2015 6:12 pm Post subject: Slime Fighter

First off, I'm not a fan of air/oil separators, especially those that 

recommend sending the 'captured' oil back into the engine so no, I don't 

have any experience with Slime Fighter.  If you are having enough 

blow-by to cause concern, the air/oil separator is just a bandaid that 

hides a more serious problem.  If you really want to put an air/oil 

separator on your engine then let the captured oil drain into a jar that 

you can empty.  Once you look at that oil, you'll know why it shouldn't 

go back in your engine.



Now to your situation .... you only have 9 hours on your engine and it's 

probably just starting to break in.  I would expect some blow-by until 

the rings seat completely.  Run your engine hard .... keeping an eye on 

CHTs ..... the higher the combustion pressures, the better the rings 

seat.  This is not the time to baby your engine, but keep the CHTs in 

line with Lycomings recommendations.

I wish I was having your issue .....

Linn .... working on gear stiffeners and wheel pants

On 3/1/2015 8:42 PM, kearney wrote:

 	  Quote: 	
		   



 Hi



 I am wondering if anyone has any experience with the Slime Fighter air/oil separator. I have 9 hours on my new engine and am starting to see some thin oil smears on the belly. When I had my Subie, I used a "Homebuilders  Engine Crankcase Oil Breather" but I am concerned that the inlet vent tube is a bit smaller than the hose used on an IO540.



 Any comments?



 Cheers



 Les

 C-GCWZ (flying again)





 Read this topic online here:



 http://forums.matronics.com/viewtopic.php?p=438862#438862





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kearney

Joined: 20 Sep 2008
Posts: 563

Posted: Sun Mar 01, 2015 6:38 pm Post subject: Re: Slime Fighter

Dave / Linn



Thanks for the comments. I filled the BPE engine with 12 qts before first start per Barrett's recommendations. Much of that was the "pipeline fill" for the oil cooler and oil lines. After a couple of ground runs I had a tad under 10 qts on the dipstick. After the first flight I added another qt as the oil seemed down.  



I am not sure what the engine "likes" oil wise but have been tracking it after each flight. It will be interesting to see where it stabilizes. I just hate slime on the belly. I had enough of that with my Cherokee! As far as oil slime goes, a little goes a long, long way!



Cheers



Les

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rv10flyer(at)live.com
Guest

Posted: Sun Mar 01, 2015 7:37 pm Post subject: Slime Fighter

Let it go until it does stabilize. My old narrow desk case likes 6qts. Any more it burns off ,temps are normal pressure is in range and I lose less than 1 qt in 6 hours. By 3 months and 25 hours oil it darker, like a new castle beer and not a guiness, at any point before replacing, so I don't think it's too low.



Sent from my iPad



 	  Quote: 	
		   On Mar 1, 2015, at 6:48 PM, kearney <kearney(at)shaw.ca> wrote:

 

 

 

 Dave / Linn

 

 Thanks for the comments. I filled the BPE engine with 12 qts before first start per Barrett's recommendations. Much of that was the "pipeline fill" for the oil cooler and oil lines. After a couple of ground runs I had a tad under 10 qts on the dipstick. After the first flight I added another qt as the oil seemed down.  

 

 I am not sure what the engine "likes" oil wise but have been tracking it after each flight. It will be interesting to see where it stabilizes. I just hate slime on the belly. I had enough of that with my Cherokee! As far as oil slime goes, a little goes a long, long way!

 

 Cheers

 

 Les

 

 

 

 

 Read this topic online here:

 

 http://forums.matronics.com/viewtopic.php?p=438865#438865

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nukeflyboy

Joined: 05 Jan 2008
Posts: 162
Location: Granbury, TX

Posted: Tue Mar 03, 2015 6:01 am Post subject: Re: Slime Fighter

I don't think any air/oil separator really works well.  All of the advice so far I agree.  To keep the oil haze off the belly I also collect the drops in a glass jar.  I drain it every time I take the cowl off and it does look nasty.

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_________________
Dave Moore
RV-6 built and sold
RV-10 built and flying

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