X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Tue, 25 Nov 2008 08:00:28 -0500 Message-ID: X-Original-Return-Path: Received: from imo-m21.mx.aol.com ([64.12.137.2] verified) by logan.com (CommuniGate Pro SMTP 5.2.10) with ESMTP id 3316005 for lml@lancaironline.net; Tue, 25 Nov 2008 01:09:56 -0500 Received: from Sky2high@aol.com by imo-m21.mx.aol.com (mail_out_v39.1.) id q.bda.38240e8f (39329) for ; Tue, 25 Nov 2008 01:09:51 -0500 (EST) From: Sky2high@aol.com X-Original-Message-ID: X-Original-Date: Tue, 25 Nov 2008 01:09:51 EST Subject: Re: [LML] 360 Fuel Vent X-Original-To: lml@lancaironline.net MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="-----------------------------1227593391" X-Mailer: AOL 9.1 sub 5000 X-Spam-Flag:NO -------------------------------1227593391 Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: 7bit Eric, Assuming all kinds of things and using pipe flow calculator for a gas known as air: If your engine is using 15 gal/hr = 2 cu ft/hr = .0335 cfm Suppose the inside diameter of 1/4" tubing is .156", the pressure of the air at the vent is .7 psi (about 200 kts) and the temp is 31F, then the air is traveling in the tube at 3 Kts. "So What?" You might ask. OK then, take a gallon jug, fit a 3/8 inch tube (engine pump fuel line size?) at one end and a quarter inch tube at the other end (vent line). Use a good sealing putty. Fill the jug with water. Let the water drain out the 3/8 tube and time it. If it drains in 3 minutes or less (1 gal/4 min = 15 gals/hr., 1 gal/3 min = 20 gph), the vent is large enough. That's just using gravity - without assistance from the engine pump or the vent pressure and 100LL may be less viscous. Grayhawk PS Let us in on the results. In a message dated 11/24/2008 10:01:34 P.M. Central Standard Time, cassutt@windstream.net writes: I am not using the header tank in my 360 and have installed 1/4" od tubing as the vent for each wing tank. My old SB manual says nothing about fuel vent size even with the header and what published updates there are for the extended bay don't have a size listed either. Is this big enough dia. for pulling fuel straight from the wings or should it be larger? What have others done. Eric Demaray 360 SB -- For archives and unsub http://mail.lancaironline.net:81/lists/lml/List.html **************One site has it all. Your email accounts, your social networks, and the things you love. Try the new AOL.com today!(http://pr.atwola.com/promoclk/100000075x1212962939x1200825291/aol?redir=http://www.aol.com/?optin=new-dp %26icid=aolcom40vanity%26ncid=emlcntaolcom00000001) -------------------------------1227593391 Content-Type: text/html; charset="US-ASCII" Content-Transfer-Encoding: quoted-printable

Eric,

Assuming all kinds of things and using pipe flow calculator for a gas k= nown=20 as air:

If your engine is using 15 gal/hr =3D 2 cu ft/hr =3D .0335 cfm

Suppose the inside diameter of 1/4" tubing is .156", the pressure of th= e=20 air at the vent is .7 psi (about 200 kts) and the temp is 31F, then the air=20= is=20 traveling in the tube at 3 Kts.

"So What?" You might ask.

OK then, take a gallon jug, fit a 3/8 inch tube (engine pump fuel=20= line=20 size?) at one end and a quarter inch tube at the other end (vent=20 line). Use a good sealing putty. Fill the jug with water.&n= bsp;=20 Let the water drain out the 3/8 tube and time it. If it drains in = ;3=20 minutes or less (1 gal/4 min =3D 15 gals/hr., 1 gal/3 min =3D 20 gph), the v= ent is=20 large enough. That's just using gravity - without assistance=20 from the engine pump or the vent pressure and 100LL may be less=20 viscous.

Grayhawk

PS Let us in on the results.

In a message dated 11/24/2008 10:01:34 P.M. Central Standard Time,=20 cassutt@windstream.net writes:

<= FONT=20 style=3D"BACKGROUND-COLOR: transparent" face=3DArial color=3D#000000 size= =3D2>I am not=20 using the header tank in my 360 and have installed 1/4" od tubing as the v= ent=20 for each wing tank. My old SB manual says nothing about fuel vent size eve= n=20 with the header and what published updates there are for the extended bay=20 don't have a size listed either. Is this big enough dia. for pulling= =20 fuel straight from the wings or should it be larger? What have others=20 done.

Eric Demaray
360 SB

--
For archives and unsub=20 http://mail.lancaironline.net:81/lists/lml/List.html

One site has it all. Your em= ail accounts, your social networks, and the things you love. Try the new=20= AOL.com today!

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