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  #1  
Old 12-04-2019, 09:46 PM
svyolo svyolo is offline
 
Join Date: Oct 2017
Location: bellingham, wa
Posts: 200
Default EFI engine shutdown

Is there a preferred method for shutting down an EFI Lycoming? Just turn off the master like on a car, or shut the fuel pump off?

Obviously both will shut the engine down. I was interested because of a wiring logic I would like to use.
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  #2  
Old 12-04-2019, 10:19 PM
Thor RV10 Thor RV10 is offline
 
Join Date: Feb 2016
Location: Stanwood, Wa
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I have been using EFII for 4 years and 800 hours now in my RV10. Shutting down starts with shutting both ECU units, then master.
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  #3  
Old 12-04-2019, 10:24 PM
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johnbright johnbright is offline
 
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Location: Newport News, Va
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Default engine should run with master contactor open

Quote:
Originally Posted by svyolo View Post
Is there a preferred method for shutting down an EFI Lycoming? Just turn off the master like on a car, or shut the fuel pump off?

Obviously both will shut the engine down. I was interested because of a wiring logic I would like to use.
IMO opening the master contactor should not kill the engine. In case of fire in the cockpit you should be able to open the master contactor and still have engine power and if the master contactor fails you should still have engine power. Stop the engine with coil, injector, or pump power your choice but kill them and the ECU within a few seconds of one another. SDS in their 6 cylinder dual ECU installation instruction says to "NEVER switch off ECU power to verify coil pack operation" so I take it as good advice to shut down the coilpacks before the ECU for EFI systems in general.
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Last edited by johnbright : 12-05-2019 at 06:38 AM. Reason: kill coilpacks before ECU
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  #4  
Old 12-05-2019, 12:23 AM
svyolo svyolo is offline
 
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Location: bellingham, wa
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Quote:
Originally Posted by johnbright View Post
IMO opening the master contactor should not kill the engine. In case of fire in the cockpit one should be able to open the master contactor and still have engine power and if the master contactor fails one should still have engine power. Stop the engine with coil power, fuel pump power, or ECU power your choice but kill them all within a few seconds of one another.
Having the engine continue to run with the battery disconnected or master off was my intention and the reason for the question.

Thanks for the responses.
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  #5  
Old 12-05-2019, 05:58 AM
219PB 219PB is offline
 
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Location: Victoria, Tx
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I have mine set up so that I can toggle an emergency bus switch which will give power to the essential buss that the engine runs on. So on a normal shutdown I just turn the master off and the engine dies. If I engage the emergency bus switch first, the engine will keep running with the master off.
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  #6  
Old 12-05-2019, 06:20 AM
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rv6ejguy rv6ejguy is offline
 
Join Date: Mar 2005
Location: Calgary, Canada
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You can kill coil or injector power or shut off the pumps.
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Turbo Subaru EJ22, SDS EFI, Marcotte M-300, IVO, Shorai- RV6A C-GVZX flying from CYBW since 2003- 439.3 hrs. on the Hobbs,
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  #7  
Old 12-05-2019, 06:38 AM
Foghorn Foghorn is offline
 
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Location: Virginia Beach
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Is there a reason you can't just pull the mixture to cutoff first?
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  #8  
Old 12-05-2019, 07:58 AM
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rv6ejguy rv6ejguy is offline
 
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Quote:
Originally Posted by Foghorn View Post
Is there a reason you can't just pull the mixture to cutoff first?
The mixture knob will reduce the AFR by 50% so if idle is set up for about 13 to 1 at the normal 12 O'clock position, this should kill the engine too. Just don't forget the position when you try to restart again.
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Turbo Subaru EJ22, SDS EFI, Marcotte M-300, IVO, Shorai- RV6A C-GVZX flying from CYBW since 2003- 439.3 hrs. on the Hobbs,
RV10 95% built- Sold 2016
http://www.sdsefi.com/aircraft.html
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  #9  
Old 12-05-2019, 08:10 AM
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airguy airguy is offline
 
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Any downside to just killing the fuel pump first?
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  #10  
Old 12-05-2019, 11:21 AM
McStevens McStevens is offline
 
Join Date: Sep 2019
Location: Edmonds, WA
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Default

Quote:
Originally Posted by airguy View Post
Any downside to just killing the fuel pump first?
I'd think this is identical to mixture cutoff for shutting down a carb engine.
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