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11-13-2014, 09:39 PM
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Join Date: Nov 2005
Location: KRTS
Posts: 1,798
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Oil analysis, high silicon
Anyone have any ideas to high silicone in an oil analysis? Lab says there are no wear metals so they don't suspect abrasive dirt, it's been a trend since new (four oil changes now).... Everything else looks great.
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11-13-2014, 10:02 PM
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Join Date: Mar 2008
Location: Seattle
Posts: 1,412
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Silicone is sand. Look for a failed air filter. Also, are any silicone sealants used on the engine?
Think of any thing made with silicon that might be in contact with the engine oil or the intake air.
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Scott Emery
http://gallery.eaa326.org/v/members/semery/
EAA 668340, chapter 326 & IAC chapter 67
RV-8 N89SE first flight 12/26/2013
Yak55M, and the wife has an RV-4
There is nothing-absolute nothing-half so much worth doing as simply messing around with Aeroplanes
(with apologies to Ratty)
2019
Last edited by SHIPCHIEF : 11-13-2014 at 10:05 PM.
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11-13-2014, 10:17 PM
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Join Date: Jan 2005
Location: 57AZ - NW Tucson area
Posts: 10,011
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Quote:
Originally Posted by SHIPCHIEF
Silicone is sand. Look for a failed air filter. Also, are any silicone sealants used on the engine?
Think of any thing made with silicon that might be in contact with the engine oil or the intake air.
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Like orange silicone valve cover seals?
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Gil Alexander
EAA Technical Counselor, Airframe Mechanic
Half completed RV-10 QB purchased
RV-6A N61GX - finally flying
Grumman Tiger N12GA - flying
La Cholla Airpark (57AZ) Tucson AZ
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11-13-2014, 10:58 PM
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Join Date: Feb 2007
Location: San Diego, CA
Posts: 1,670
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I think Silicone and Silicon are two different things. But I'm not a chemist, and I didn't sleep at any Motel or Hotel last night!! 
You sure it wasn't Silicon in the oil analysis? As mentioned above, Silicon is usually "dirt". Sand, dust, etc.
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Pete Hunt, [San Diego] VAF #1069
RV-6, RV-6A, T-6G
ATP, CFII, A&P
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Last edited by PCHunt : 11-13-2014 at 11:10 PM.
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11-13-2014, 11:09 PM
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Join Date: Dec 2011
Location: Livermore, CA
Posts: 6,767
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Excessive use of DC-4 on filter gasket?
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11-13-2014, 11:40 PM
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Join Date: May 2010
Location: Benaraby Queensland. Australia
Posts: 209
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I believe it has happened with wear of the pistons, usually the skirt area. Silicon is used in some aluminium alloys.
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11-14-2014, 03:41 AM
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Join Date: Jan 2005
Posts: 1,009
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Take a deep breath, relax, and...
Most common source is as Gill noted above. The analysis is primarily trend info. Start using Aeroshell multi grade and you'll probably get a spike in copper as well.All of the detail available today is great, but it can drive you nuts,if you let it. A little like checking a stock portfolio two or three times a day.
Terry, CFI
RV9A N323TP
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11-14-2014, 06:38 AM
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Join Date: Nov 2005
Location: KRTS
Posts: 1,798
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Pete you're right, silicon.
This oil change I used a dab of oil to lube the filter gasket to see if that's the culprit. I use a K&N filter, and last change I cleaned and oiled it, but then saw a bigger spike so I'm suspect if the filter oil could be a source as well.
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11-14-2014, 07:53 AM
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Join Date: Jan 2005
Location: 57AZ - NW Tucson area
Posts: 10,011
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Quote:
Originally Posted by PCHunt
I think Silicone and Silicon are two different things. But I'm not a chemist, and I didn't sleep at any Motel or Hotel last night!!
You sure it wasn't Silicon in the oil analysis? As mentioned above, Silicon is usually "dirt". Sand, dust, etc. |
From Blackstone...
http://www.blackstone-labs.com/the-silicon-bugaboo.php
__________________
Gil Alexander
EAA Technical Counselor, Airframe Mechanic
Half completed RV-10 QB purchased
RV-6A N61GX - finally flying
Grumman Tiger N12GA - flying
La Cholla Airpark (57AZ) Tucson AZ
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11-14-2014, 08:00 PM
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Join Date: Nov 2005
Location: KRTS
Posts: 1,798
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Black stone is who I use... Highly recommended.
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