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Why starve engine of fuel to shut down

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Gary.A.Sobek

Joined: 09 Jan 2006
Posts: 217
Location: SoCAL USA

Posted: Sat Feb 03, 2007 6:45 am Post subject: Why starve engine of fuel to shut down

You can but it is not recommended.



Most airplane engines have mags.  Mags provide their own electricity to the 

ignition circuit.



If you have an air / fuel charge in the cylinder, move the prop, the engine 

can start with just a simple open circuit in the ground wire to the mag 

switch.



Gary A. Sobek

"My Sanity" RV-6 N157GS O-320 Hartzell,

1,977 + Flying Hours So. CA, USA





----Original Message Follows----

From: "Garry" <garrys(at)tampabay.rr.com>

Reply-To: rv-list(at)matronics.com

To: <rv-list(at)matronics.com>

Subject: Re: Re: I've sworn off purge valve installations

Date: Sat, 3 Feb 2007 07:54:12 -0500



I've been reading this thread with some interest, hoping to learn something 

practical when I begin flying my RV 7A.  I have an IO360 from Aerosport and 

hope to be flying in the next couple of months.  What I don't understand is 

why can't you shut down the engine simply by turning off the mag switches?  

Why the need to shut down by starving the engine of fuel?  We don't do this 

with our cars, or lawnmowers, or any other gasoline engine powered device, 

so why airplanes?



Garry Stout

Tampa Florida



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wdleonard(at)gmail.com
Guest

Posted: Sat Feb 03, 2007 10:32 am Post subject: Why starve engine of fuel to shut down

It is important that there be no fuel left in the cylinders after shut down.  Safety is part of the reason.  If someone accidentally left the mags on, turning the prop could cause it to fire.  Also, gas left in the cylinder can wash away the thin layer of lubricating oil.  Given that airplanes often sit for long periods that could lead to significant rust issues. 

  

 We don't do it in cars because the computer does it for us.

 

 -- 

David Leonard



Turbo Rotary RV-6 N4VY

My websites at:

http://members.aol.com/_ht_a/rotaryroster/index.html

 http://members.aol.com/_ht_a/vp4skydoc/index.html

http://leonardiniraq.blogspot.com 

 

   	  Quote: 	
		  

----Original Message Follows----

From: "Garry" < garrys(at)tampabay.rr.com (garrys(at)tampabay.rr.com)>

Reply-To: rv-list(at)matronics.com (rv-list(at)matronics.com)

To: <rv-list(at)matronics.com (rv-list(at)matronics.com)>

Subject: Re: Re: I've sworn off purge valve installations 

Date: Sat, 3 Feb 2007 07:54:12 -0500



I've been reading this thread with some interest, hoping to learn something

practical when I begin flying my RV 7A.  I have an IO360 from Aerosport and

hope to be flying in the next couple of months.  What I don't understand is 

why can't you shut down the engine simply by turning off the mag switches?

Why the need to shut down by starving the engine of fuel?  We don't do this

with our cars, or lawnmowers, or any other gasoline engine powered device, 

so why airplanes?



Garry Stout

Tampa Florida



	


  [quote][b]

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lhelming(at)sigecom.net
Guest

Posted: Sat Feb 03, 2007 12:29 pm Post subject: Why starve engine of fuel to shut down

And because the car does not have a prop that can  smack you.  do not archive.

 [quote]   ---

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