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05-24-2017, 07:51 PM
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Join Date: Jun 2007
Location: palm coast fl.
Posts: 945
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Oil
At 25 hours I'm down a quart and a half . Instead of adding I pump out the remaining 5-1/2 quarts and refill with 7 Fresh . At 50 hours it gets drained , screen checked and new filter . Cheap way to have fresh oil constantly
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Rv8
N 666 TA
First Flight 2-3-2015 🚀
2017 donation paid
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05-24-2017, 07:57 PM
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Join Date: Mar 2005
Location: Dallas area
Posts: 10,768
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You might try running at 6 qts. instead of 7. Many engines throw out a quart if over 6.
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Mel Asberry, DAR since the last century.
EAA Flight Advisor/Tech Counselor, Friend of the RV-1
Recipient of Tony Bingelis Award and Wright Brothers Master Pilot Award
USAF Vet, High School E-LSA Project Mentor.
RV-6 Flying since 1993 (sold)
<rvmel(at)icloud.com>
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05-24-2017, 08:05 PM
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Super Moderator
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Join Date: Oct 2005
Posts: 752
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Quote:
Originally Posted by Mel
You might try running at 6 qts. instead of 7. Many engines throw out a quart if over 6.
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They're called Lycomings, Mel :-)
Years ago I spoke with a friend who worked sales for Lycoming. He told me to run the engine between 5 and 6 quarts. Anything above 6 will get thrown out. That was 10 years ago. I've run the engine between 5 and 6 ever since. I add a quart about every 13-15 hours to get back to 6 qt. The belly stays pretty clean.
Chris
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Chris Pratt (2020 VAF DUES PAID)
RV-8 Flying, 850+hours
N898DK
Lycoming O-360-A1A, Hartzell CS
52F (Northwest Regional, Aero Valley, Whatever, TX)
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05-24-2017, 08:24 PM
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Join Date: Oct 2012
Location: Clearwater, FL KCLW
Posts: 1,281
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I have to add 7 qts to an empty sump to get to the 6 qt mark on the dipstick. But, anything over that does indeed end up on the belly, so I don't fill beyond that mark.
Chris
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Chris Johnson
RV-9A - Done(ish) 4/5/16! Flying 4/7/16
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05-24-2017, 08:28 PM
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Join Date: Jun 2007
Location: palm coast fl.
Posts: 945
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Oil
Quote:
Originally Posted by Mel
You might try running at 6 qts. instead of 7. Many engines throw out a quart if over 6.
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I agree with that
Mines an angle valve , holds 8 . I never fill it passed seven .
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Rv8
N 666 TA
First Flight 2-3-2015 🚀
2017 donation paid
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05-25-2017, 01:34 PM
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Join Date: Dec 2008
Location: Tehachapi, CA
Posts: 154
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Absoulute value limits for contaminants?
Anyone have any absolute values that can be used as limits for the various contaminants in Lycoming engines?
Cheers
Nige
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Nigel Speedy
RV-8
Flying
Tehachapi CA
I paid my -VAF- dues July 2018
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05-25-2017, 07:51 PM
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Join Date: Jul 2005
Location: Denver, CO
Posts: 295
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Have you looked at Lycoming SB 480F?
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// corey crawford
// rv-7a (sold)
// denver, co @ KBJC
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05-25-2017, 10:43 PM
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Join Date: Oct 2013
Location: Schaumburg, IL
Posts: 5,297
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Your engine is producing a pretty stable amount of metal. Each healthy engine will make a certain quantity of metal per hour due to wear, variable on factors, such as RPM, load, number or starts per hour, etc.
You should to expect to double the quantity of metal in your oil if you double the run time on the oil. It's not that the extended usage interval caused the metal wear, but that the oil was there twice as long to collect the metal the engine was producing. Your engine produces about 1 PPM of iron per hour. Therefore, a 25 hour interval will show ~25 PPM and a 50 hour interval will show 50 PPM.
I am not advocating extended oil changes, but not for metal reasons. Generally, it is the fact that lead and soot will, at some point, overload the oil's ability to hold it in suspension and it will deposit the excess in the engine as sludge once you reach this saturation point.
Larry
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N64LR - RV-6A / IO-320, Flying as of 8/2015
N11LR - RV-10, Flying as of 12/2019
Last edited by lr172 : 05-25-2017 at 10:51 PM.
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05-26-2017, 05:44 AM
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Join Date: Oct 2011
Location: Kennesaw, Ga
Posts: 825
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duration of time
You also have to consider how long does it take you to fly 25 or 50 hours. I've easily flow 25 hours in a couple of weeks at times and at other times in the past when I flew a gas guzzler and fuel was $7 to $8 per gallon, I flew 25 hours in a year.... Obviously the time span has to be considered.
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Amir
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RV-7
RV-10 - Sold
Supporting VAF since the first visit
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05-26-2017, 07:05 AM
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Join Date: Jan 2007
Location: Stuart, FL /Hartford, CT/Virgin Gorda,BVI
Posts: 3,122
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Quote:
Originally Posted by YellowJacket RV9
I have to add 7 qts to an empty sump to get to the 6 qt mark on the dipstick. But, anything over that does indeed end up on the belly, so I don't fill beyond that mark.
Chris
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sounds like the 6 qt mark is actually the 7 qt mark now. 
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Ed D'Arcy
RV6-A 5,200+ hrs, R-44 1,600 hrs, Helicycle 320 hrs, gyro sold,35,000 miles flown in 2015 
Stuart, Fl / S WINDSOR,Ct / Virgin Gorda, BVI - under major repair from hurricane damage
VAF #840 EAA AOPA FAC FABA QB SPA
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