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  #31  
Old 03-17-2023, 08:43 AM
Flying Canuck Flying Canuck is offline
 
Join Date: Jan 2015
Location: Red Deer, Alberta, Canada
Posts: 698
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My 9A was parked in a heated hangar for 5-1/2 months last year as I was down recovering from shoulder surgery. A good portion of that time the propeller was removed for tear down inspection. My mechanic told me that if my oil was fresh, it shouldn't be much of an issue - but don't start it unless you are going flying. When it was time to fly again, I made sure I'd topped off the battery and everything went fine.

3 weeks really isn't much of a break, in the cold Alberta winter, I'm often 3-4 weeks between flights. I'd be more concerned with pilot rust than engine issues.
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Claude Pitre
RV-9A #91081, C-GCPT
Dynon SkyView HDX, IO-320 and WW 200RV C/S. Flying as of August 6, 2018

Added GPS 175 and authorized for IFR April 1, 2021

Interactive map of all of my flights here
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  #32  
Old 03-17-2023, 09:01 AM
thiggins thiggins is offline
 
Join Date: Mar 2020
Location: Saluda,NC
Posts: 213
Default RAM aircraft video on corrosion

https://youtu.be/PSx2_vdozMg
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ASEL INST COMM Tail-wheeler
RV-12iS builder (Empennage complete, Wings complete!, Fuselage well under way!, finish kit under way!, Garmin avionics ordered, engine ordered, shop out of order )
Got a hangar, and moved some large pieces in!
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  #33  
Old 03-17-2023, 09:34 AM
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MacCool MacCool is offline
 
Join Date: Aug 2020
Location: central Minnesota
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Quote:
Originally Posted by thiggins View Post
Some good points regarding the value of compression testing, ongoing oil analysis, and inspection of filter pleats.
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RV-9A, 2011, bought flying
IO-320D1A (factory new), C/S
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  #34  
Old 03-18-2023, 09:43 AM
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Snowflake Snowflake is offline
 
Join Date: Oct 2009
Location: Sidney, BC, Canada
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Quote:
Originally Posted by tracy View Post
I would think a fresh oil change and filter would drain a lot of moisture out of engine, then periodically ground run it for 20 seconds as not to get it hot, but lubricate the internals ,would be helpful keeping everything lubricated without any extra moisture forming.
20 seconds isn't enough to get any oil pressure built up to move oil around. But heating the air volume inside the engine *does* happen quickly, a 20 second "run" would then condense it's moisture on the cold surfaces of the engine where no new oil has been deposited, and you're worse off than if you just let it sit.

Don't start your engine unless you plan to run it for a good 20-30 minutes at cruise power settings... You need that to boil off the residual moisture in the oil left over from the last run. If you don't, you just add to it.
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1996 RV-6 "Tweety" C-FRBP (formerly N196RV)
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  #35  
Old 03-18-2023, 10:58 AM
wil780 wil780 is offline
 
Join Date: Nov 2020
Location: Canada
Posts: 7
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The point of a brief run of a cold engine is to coat all the surfaces with cold oil, which leaves a much thicker layer than does a shutdown hot. The thicker layer should be more resistant to being washed off by condensation. My direct observation is that the thick layer stays in place during five months of winter inactivity, with much more oil everywhere than is normally present the day after shutting down hot.

Whether this is actually better is a matter of opinion, of course. It assumes that the last flight got the oil hot enough long enough to boil off all the water, so the only moisture present is what is produced during the 45 - 60 second run cold. It also assumes nobody turns the prop to scrape the oil off the cam and cylinder walls.
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  #36  
Old 03-18-2023, 11:53 AM
tracy tracy is offline
 
Join Date: Dec 2012
Location: chattanooga,tn
Posts: 326
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Quote:
Originally Posted by Snowflake View Post
20 seconds isn't enough to get any oil pressure built up to move oil around. But heating the air volume inside the engine *does* happen quickly, a 20 second "run" would then condense it's moisture on the cold surfaces of the engine where no new oil has been deposited, and you're worse off than if you just let it sit.

Don't start your engine unless you plan to run it for a good 20-30 minutes at cruise power settings... You need that to boil off the residual moisture in the oil left over from the last run. If you don't, you just add to it.
My oil pressure is up in 4 seconds, leaving 16 to coat internals. An old aircraft builder told me this works. Who knows?
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  #37  
Old 03-18-2023, 01:03 PM
robert@jonesrv10.net robert@jonesrv10.net is offline
 
Join Date: May 2021
Location: Las Vegas
Posts: 90
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Quote:
Originally Posted by SwimmingDragonfly96 View Post
Due to weather and travel, I donít think Iíll be able to fly my new to me 7a for about 3 weeks total (one week in now). I know planes sit for months to years sometimes and their motor is fine, while others in similar conditions will develop problems.

I could go over to the hangar and ground taxi it for some minutes to get everything flowing, but Iíve heard this doesnít do much to help the motor. What are your opinions? Should I let it sit or go taxi it for a bit?
I canít imagine an engine having problems with sitting for 3 weeks. Lots of aircraft do that for different reasons. Use camguard if you are worried.
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  #38  
Old 03-18-2023, 02:49 PM
rockwoodrv9 rockwoodrv9 is offline
 
Join Date: Dec 2011
Location: Meridian ID, Aspen CO, Okemos MI
Posts: 3,348
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Quote:
Originally Posted by robert@jonesrv10.net View Post
I canít imagine an engine having problems with sitting for 3 weeks. Lots of aircraft do that for different reasons. Use camguard if you are worried.
I wonder what percent of engines make it to TBO. If it is the majority then there probably isnít a need for some changes. I have never used one in the past but bought one today from rbaviation. If 40% humidity is the number to beat, humidity is always higher here in Michigan. For a small investment I hope to help me get closer to TBO than the average engine.
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Williamston MI
O-320 D2A
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2023
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  #39  
Old 03-18-2023, 03:37 PM
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Ironflight Ironflight is offline
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Join Date: Jan 2005
Location: Dayton, NV
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Quote:
Originally Posted by robert@jonesrv10.net View Post
I canít imagine an engine having problems with sitting for 3 weeks. Lots of aircraft do that for different reasons. Use camguard if you are worried.
To be honest, this is probably the best answer to the OPís question I have seen in this thread. Iíve owned airplanes for 45 years, and while I fly a lot, I donít get around to every plane every week. Heck, this winter we flew one of our planes once in January due to all the storms coming across the Sierra- and all the rest just sat!

Donít let your airplane sit any longer than necessary, donít try short little ground runs because you think it will helpÖ.and donít let your airplane stop you from that once-in-a-lifetime month-long cruise to Antarctica!

The majority of homebuilders will never get anywhere close to enough hours on their plane/engine to worry about TBOÖ.

Paul
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Editor at Large - KITPLANES Magazine
RV-8 - N188PD - "Valkyrie"
RV-6 (By Marriage) - N164MS - "Mikey"
RV-3B - N13PL - "Tsamsiyu"
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  #40  
Old 03-19-2023, 09:27 AM
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Snowflake Snowflake is offline
 
Join Date: Oct 2009
Location: Sidney, BC, Canada
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Quote:
Originally Posted by wil780 View Post
It assumes that the last flight got the oil hot enough long enough to boil off all the water, so the only moisture present is what is produced during the 45 - 60 second run cold.
Every flight, no matter how long, will end with moisture condensing in the engine after shutdown. It isn't "dry" when you park it after a longer flight, it just has the minimum amount of moisture possible because it's boiled off all of the remnants from previous flights.

Any ground run that isn't long enough or hot enough to boil off that moisture, will have the moisture of the current run *added* to it at shutdown. Your 45-60 second run is adding moisture to a system that already has moisture, every time you do it... And it's not removing any because you're not running it long enough to boil anything off.
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1996 RV-6 "Tweety" C-FRBP (formerly N196RV)
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