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Sniffle Valve

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Mark Phillips in TN

Joined: 10 Jan 2006
Posts: 431
Location: Columbia, TN

Posted: Mon May 21, 2007 10:28 pm Post subject: Sniffle Valve

I am installing a Lycoming sniffle valve (included in Vans FWF kit) to an 

Aerosport IO-360 and would like to confirm its intended operation.  I "think" it 

is basically a check valve that should open when manifold pressure is equal to 

atmospheric (engine not running) to drain any fuel pooled in the sump.  Engine 

running, it should close when manifold pressure drops.  The valve I have 

flows freely when blowing into the sump side, but still passes a bit of air when 

blown into from the tube side, which I surmise would constitute a small vacuum 

leak and possible leaner than normal operation.  



Is this normal?



Thanks-

Mark

See what's free at AOL.com. 

  [quote][b]

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From The PossumWorks...

rv9jim(at)juno.com
Guest

Posted: Tue May 22, 2007 8:38 am Post subject: Sniffle Valve

Mark

        I believe that the sniffle valve is for carburated engines.  Its

purpose is to remove any fuel that might pool in the bottom of the air

cleaner from to vigorous application of the throttle during starting. 

That is the fire hazard.  With fuel injection, fuel is only put into the

engine at the intake valve.  It will be difficult but possible to get

fuel to run back down and into the air cleaner area.  Pumping the

throttle during start will not add any additional fuel to the slow moving

air stream.    IMHO, anything is possible but with FI, you will have

flooded the engine seriously. to get in that condition.  I could be wrong

in these scenarios but I am not installing one in my IO 360.

Jim

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klwerner(at)comcast.net
Guest

Posted: Tue May 22, 2007 8:57 am Post subject: Sniffle Valve

To the contrary, sniffle valves are  intended for injected Engines with the front intake sumps, I  believe?

 I am not sure if they are also used  on updraft injected Engines. Please correct me if I am wrong.

 do not archive

 [quote]   ---

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dasduck(at)comcast.net
Guest

Posted: Tue May 22, 2007 10:06 am Post subject: Sniffle Valve

Konrad,

 you're correct, and for rear intake  sumps.

 When you 'prime' and after shutdown, fuel drips into the  intake area and runs down the intake tubes and puddles in the tubes that run  thru the sump.

  

 it's not uncommon for fuel to drip out the drain I have  coming from my 'sniffles' after shutdown, or after a 'failed'  start.

 don



   From: owner-rv-list-server(at)matronics.com  [mailto:owner-rv-list-server(at)matronics.com] On Behalf Of Konrad L.  Werner

Sent: Tuesday, May 22, 2007 9:57 AM

To:  rv-list(at)matronics.com

Subject: Re: Sniffle  Valve

 

 To the contrary, sniffle valves are  intended for injected Engines with the front intake sumps, I  believe?

 I am not sure if they are also used  on updraft injected Engines. Please correct me if I am wrong.

 do not archive

 [quote]   ---

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dasduck(at)comcast.net
Guest

Posted: Tue May 22, 2007 10:28 am Post subject: Sniffle Valve

Mark,

 to theorize on your  original question:

 My sump has 2 of the  valves, one on each side, and no amount of cleaning them gets a 'perfect  seal'.

  

 Considering the 'design'  of the sumps, if the valve does leak a bit, it's likely a very small percentage  of airflow in, and, affects all cylinders the same, so I would 'think' that it  isn't going to adversely affect your mixture, especially since you are  dynamically adjusting the mixture all the time and 'monitoring' the end  result.

  

 I have wondered about  this as well, and plugging the outlets completely yielded no discernible  difference in operation.

 Don



   From: owner-rv-list-server(at)matronics.com  [mailto:owner-rv-list-server(at)matronics.com] On Behalf Of  Fiveonepw(at)aol.com

Sent: Monday, May 21, 2007 11:27  PM

To: rv-list(at)matronics.com

Subject: Sniffle  Valve

 

I am installing a Lycoming sniffle valve (included in Vans FWF kit)  to an 

Aerosport IO-360 and would like to confirm its intended  operation.  I "think" it 

is basically a check valve that should open  when manifold pressure is equal to 

atmospheric (engine not running) to drain  any fuel pooled in the sump.  Engine 

running, it should close when  manifold pressure drops.  The valve I have 

flows freely when blowing  into the sump side, but still passes a bit of air when 

blown into from the  tube side, which I surmise would constitute a small vacuum 

leak and possible  leaner than normal operation.  



Is this  normal?



Thanks-

Mark

   See what's free at AOL.com.  

[quote]



href="http://www.matronics.com/Navigator?RV-List">http://www.matronics.com/Navigator?RV-List

href="http://forums.matronics.com">http://forums.matronics.com



[b]

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klwerner(at)comcast.net
Guest

Posted: Tue May 22, 2007 10:53 am Post subject: Sniffle Valve

Daser Don,

 I should have just said Horizontal  intake sumps (i.e front- and rear intake). Thank you for clarifying this.  But let me ask you this, why would it not matter in a vertical intake FI  engine?

 Konrad 

 [quote]   ---

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av8er2fly(at)peoplepc.com
Guest

Posted: Tue May 22, 2007 3:01 pm Post subject: Sniffle Valve

My sniffle valve did not come with the FWF kit, it was a add on, glad to  hear they are now in the kit. IO360 RV8A 116 hrs and loving the plane. Mark Rose  137MR

 [quote]   ---

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Kellym

Joined: 10 Jan 2006
Posts: 1705
Location: Sun Lakes AZ

Posted: Wed May 23, 2007 4:22 pm Post subject: Sniffle Valve

Most production IO-360s in certificated aircraft like my Mooney have 

sniffle valves.

James H Nelson wrote:

 	  Quote: 	
		   



 Mark

         I believe that the sniffle valve is for carburated engines.  Its

 purpose is to remove any fuel that might pool in the bottom of the air

 cleaner from to vigorous application of the throttle during starting. 

 That is the fire hazard.  With fuel injection, fuel is only put into the

 engine at the intake valve.  It will be difficult but possible to get

 fuel to run back down and into the air cleaner area.  Pumping the

 throttle during start will not add any additional fuel to the slow moving

 air stream.    IMHO, anything is possible but with FI, you will have

 flooded the engine seriously. to get in that condition.  I could be wrong

 in these scenarios but I am not installing one in my IO 360.

 Jim

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Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

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_________________
Kelly McMullen
A&P/IA, EAA Tech Counselor # 5286
KCHD

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