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  #1  
Old 09-21-2021, 09:39 AM
Jetmart's Avatar
Jetmart Jetmart is offline
 
Join Date: Sep 2019
Location: Windsor, Ontario
Posts: 393
Default IO-390 Oil Consumption

Looking for some current experience on oil consumption during break in and what it ultimately stabilizes at on the IO-390.
I have done a forum search but did not come across much recent discussion on the topic although there are a lot more flying.
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Glenn Martin
Windsor, Ontario
1942 Tiger Moth
2017 Waco YMF-5
RV-14 Kit # 140694
First Flight - June 22, 2021
2021 Dues Paid
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  #2  
Old 09-21-2021, 06:46 PM
N49ex N49ex is offline
 
Join Date: Apr 2015
Location: Wheaton, Illinois
Posts: 143
Default IO-390 Oil Consumption

This is just my personal experience: I installed a factory new 390 a couple of years ago (under the then Lycoming experimental program). After the prescribed break in flights, my initial oil consumption was relatively high. Prior experience with breaking in 360s was that after around an hour of full power flight the CHTs would drop noticeably, and oil consumption after break in would drop to decent low levels quickly. With a little bit of alarm, I discussed this with Lycoming and was informed that with the 390 series a new type of substantially harder oil rings were being used, and they break in much slower. I was advised to keep running break in oil until the consumption dropped and stabilized and expect that to take up to 50 hours. In my case it was 75! And even after that, the oil consumption kept dropping a bit more over time, and has converged to around a quart in 10 to 12 hours. Aeroshell W100 consumption is noticeably higher than Phillips X/C. I'm not totally happy with this level of consumption, but have been told it is OK for the 390 and at 450 hours now my compressions run 79/80 to 80/80! So, I guess I am happy...
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  #3  
Old 09-21-2021, 08:13 PM
dmattmul dmattmul is offline
 
Join Date: Dec 2015
Location: Spring Hill, FL
Posts: 183
Default Oil Consumption

I also have a 390 on a 14A and around 70 hours the consumption seemed to stabilize around one quart every 7 to 8 hours. It was not that much higher the previous 20 hours. Now it's 8 to 9 hours per quart at 130 hours. Compressions looked good first annual. I known other 390 operators and there consumption not much different if not higher than mine. Using Aeroshell W100. Oil analysis and screen check look ok. Will keep flying and monitoring.
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RV-14A QB building, Lycoming 390 Thunderbolt arrived July 2019, Garmin avionics, Vertical Power, EFII-32 Ignition and Fuel, Whirlwind 300-72, Parts became a real airplane 8/15/2020.
Started RV-10 Nov 2020. Empennage arrived (Built) Working on QB kits. Garmin avionics, Vertical Power, EFII-32 Ignition and Fuel, Whirlwind 3 blade, real airplane hopefully early 2023.
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  #4  
Old 09-22-2021, 05:12 AM
Nova RV Nova RV is offline
 
Join Date: Aug 2015
Location: Leesburg, VA
Posts: 574
Default

I am at 200hrs now and the oil consumption seems to have improved all through the 1st 100hrs. I would note that I never fill above 6 quarts which has helped a lot with elimination of oil going out the vent and mistakenly assuming it was burned. I added 1.5qts between my last oil changes with 50hr interval.
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Leesburg, VA

CFI-I ASMEL, ATP

RV-14A kit # 140243 (flying as of 11/18)

www.mykitlog.com/chrismoon/
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  #5  
Old 09-22-2021, 06:22 AM
JDA_BTR JDA_BTR is offline
 
Join Date: Dec 2013
Location: Colorado Springs, CO
Posts: 1,359
Default

I have the same experience as Chris with about 1-2 quarts/50 hours at 205 hours. It definitely likes being less than 7 quarts.
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  #6  
Old 09-22-2021, 04:35 PM
DougZetting DougZetting is offline
 
Join Date: Feb 2016
Location: Salt LakeCity
Posts: 32
Default

I am in phase 1 with about 18 hours total. I regularly top it off to 6 quart mark. I burned about a quart every 2 hours until about 13.5 total hours. At about the 13 hour mark the CHTís dropped about 30 degrees, the oil temps dropped about 20 degrees, and I topped off the oil with 1/2 a quart today after about 4.5 hours since last fill. I have been running hard most of those hours to break in the motor. Guess maybe most of the break in is done.
Hope that helps.
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Draper UT
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  #7  
Old 09-22-2021, 07:39 PM
dmattmul dmattmul is offline
 
Join Date: Dec 2015
Location: Spring Hill, FL
Posts: 183
Default Normal usage

All we can do is keep checking and fly. The flying part I love.....
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RV-14A QB building, Lycoming 390 Thunderbolt arrived July 2019, Garmin avionics, Vertical Power, EFII-32 Ignition and Fuel, Whirlwind 300-72, Parts became a real airplane 8/15/2020.
Started RV-10 Nov 2020. Empennage arrived (Built) Working on QB kits. Garmin avionics, Vertical Power, EFII-32 Ignition and Fuel, Whirlwind 3 blade, real airplane hopefully early 2023.
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  #8  
Old 09-22-2021, 08:21 PM
iamtheari iamtheari is offline
 
Join Date: Nov 2017
Location: ND
Posts: 571
Default

I am at 60 engine hours. I ran Aeroshell 80 for break-in and switched to Phillips XC 20W-50 just recently, with no flights on that oil yet. My first few oil changes were at 10, 35, and 60 hours. My oil consumption seemed to be about 1 quart per 10 hours by the end of the Aeroshell 80 period.
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  #9  
Old 09-24-2021, 08:52 PM
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lluciani lluciani is offline
 
Join Date: Jun 2005
Location: Tomball, TX
Posts: 75
Default Mine is taking a while to break in (I think)

My IO-390 is at about 85 hours and it is still burning 1 quart every 5 hours. I fill to about 6 1/2 quarts and let it drop to 5 1/2. My cylinder head temps make it up to only 300-305 after leaning. So cylinder head temp-wise, mine seems broken in but old consumption-wise, it doesn't seem to be.
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  #10  
Old 09-25-2021, 06:12 AM
LR60 LR60 is offline
 
Join Date: Jan 2011
Location: Trinity,NC
Posts: 46
Default Expecting a long break in.

Iím at 28 hours and burning 1 qt every 5 hours. Operate from 6 down to 5 on the stick.

I ran the first 20 hours very hard with no slow flight, and only in last few hours did I work through some of the slow flight stalls, stability checks etc.

Based on otherís who have broke in the io-390 Iím expecting a long break in process and even then have read this engine does like oil. I plan to run it hard with mineral oil at least to 75 hours prior to switching, if not more.
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RV-14 (flying since 8-11-21)
SN-140458
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