Return-Path: Received: from [216.52.245.18] (HELO ispwestemail2.mdeinc.com) by logan.com (CommuniGate Pro SMTP 4.3c3) with ESMTP id 800293 for flyrotary@lancaironline.net; Thu, 17 Mar 2005 08:49:09 -0500 Received-SPF: none receiver=logan.com; client-ip=216.52.245.18; envelope-from=wschertz@ispwest.com Received: from 7n7z201 (unverified [67.136.146.35]) by ispwestemail2.mdeinc.com (Vircom SMTPRS 4.0.340.3) with SMTP id for ; Thu, 17 Mar 2005 05:48:17 -0800 Message-ID: <00b501c52af7$fc4842d0$23928843@7n7z201> From: "William" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] Returnless fuel systems Date: Thu, 17 Mar 2005 07:48:19 -0600 MIME-Version: 1.0 Content-Type: text/plain; format=flowed; charset="iso-8859-1"; reply-type=response Content-Transfer-Encoding: 7bit X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2900.2180 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.2180 Ernest, My impression is that the problem arises from the difference between venting vapor through a carb jet (which has to be big enough to supply all 4 or 6 cylinders) and the orifice of an injector, which is (I think) smaller. The injector opens for a short pulse, and the vapor flow is small, so the bubble doesn't clear out easily. As a point of interest, there is an E-racer at my home airport that does the fuel recirculation up to the cold side of the firewall, and only a single line goes forward to the injectors. That system has been working well, with no vapor lock, and seems similiar to what you are proposing. Bill Schertz KIS Cruiser # 4045 ----- Original Message ----- From: "Ernest Christley" To: "Rotary motors in aircraft" Sent: Wednesday, March 16, 2005 9:16 PM Subject: [FlyRotary] Returnless fuel systems > But what happens in carbuerated systems? There is a bowl there collecting > and holding a 1/2 cup of fuel along with the delivery lines and the pumps > only deliver a few pounds of pressure vs the 10's of pound in an injected > systems. How do the carbs get away with it? > >>> Homepage: http://www.flyrotary.com/ >>> Archive: http://lancaironline.net/lists/flyrotary/List.html