X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Wed, 13 Jun 2012 20:49:24 -0400 Message-ID: X-Original-Return-Path: Received: from imr-ma05.mx.aol.com ([64.12.100.31] verified) by logan.com (CommuniGate Pro SMTP 5.4.5) with ESMTP id 5598310 for lml@lancaironline.net; Wed, 13 Jun 2012 20:12:50 -0400 Received-SPF: pass receiver=logan.com; client-ip=64.12.100.31; envelope-from=Sky2high@aol.com Received: from mtaomg-db04.r1000.mx.aol.com (mtaomg-db04.r1000.mx.aol.com [172.29.51.202]) by imr-ma05.mx.aol.com (8.14.1/8.14.1) with ESMTP id q5E0C7dX021282 for ; Wed, 13 Jun 2012 20:12:07 -0400 Received: from core-mtb002a.r1000.mail.aol.com (core-mtb002.r1000.mail.aol.com [172.29.234.197]) by mtaomg-db04.r1000.mx.aol.com (OMAG/Core Interface) with ESMTP id A1E7DE00008C for ; Wed, 13 Jun 2012 20:12:06 -0400 (EDT) From: Sky2high@aol.com X-Original-Message-ID: <2c6b8.1bcb0bf0.3d0a8656@aol.com> X-Original-Date: Wed, 13 Jun 2012 20:12:06 -0400 (EDT) Subject: Re: [LML] Airflow Performance questions X-Original-To: lml@lancaironline.net MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="part1_2c6b8.1bcb0bf0.3d0a8656_boundary" X-Mailer: AOL 9.6 sub 168 X-Originating-IP: [67.175.156.123] x-aol-global-disposition: G X-AOL-SCOLL-SCORE: 0:2:411074112:93952408 X-AOL-SCOLL-URL_COUNT: 0 x-aol-sid: 3039ac1d33ca4fd92c56595e --part1_2c6b8.1bcb0bf0.3d0a8656_boundary Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: 7bit Gary, The Bendix injection system for smaller Lycomings requires that the throttle body have a minimum fuel pressure to operate through the spider properly. It doesn't care how the minimum pressure is maintained. Typically, the engine driven provides pressure in excess of the minimum and that help reduce inline vaporization. Typically, an electric pump is also designed to deliver this excess pressure fuel. In these systems, pressure regulation occurs at the pump. In Other systems, pressure may be regulated by regulation at the throttle body by sending excess fuel back to the tank from whence it came. If you are interested, you should study complete aviation fuel systems that you may be able to find on the internet. To answer your question, most fuel system do no rely on non-engine driven pump to maintain the pressure although certain specialized my require such high constant pressure that a separate pump designed to maintain that pressure is used. Scott Krueger In a message dated 6/13/2012 10:37:48 A.M. Central Daylight Time, gbfitz@swbell.net writes: Does the Airflow Performance fuel injection use an engine-powered pump, or does it rely on the electrical pump for fuel delivery all the time? Is there a difference in the principle of operation of this system compared to the standard Lycoming fuel injection system or the Silver Hawk system? Gary Fitzgerald LNC2 ~70% St. Charles, MO Looking for a good deal on a used or rebuildable (I)O-360 --part1_2c6b8.1bcb0bf0.3d0a8656_boundary Content-Type: text/html; charset="US-ASCII" Content-Transfer-Encoding: quoted-printable

Gary,

The Bendix injection system for smaller Lycomings requires that the=20 throttle body have a minimum fuel pressure to operate through the spider=20 properly. It doesn't care how the minimum pressure is maintained.&nbs= p;=20 Typically, the engine driven provides pressure in excess of the minimum and= that=20 help reduce inline vaporization. Typically, an electric pump is also= =20 designed to deliver this excess pressure fuel. In these systems, pres= sure=20 regulation occurs at the pump. In Other systems, pressure may be regu= lated=20 by regulation at the throttle body by sending excess fuel back to the tank = from=20 whence it came. If you are interested, you should study complete=20 aviation fuel systems that you may be able to find on the internet.

To answer your question, most fuel system do no rely on non-engine dri= ven=20 pump to maintain the pressure although certain specialized my require such = high=20 constant pressure that a separate pump designed to maintain that pressure i= s=20 used.

Scott Krueger

In a message dated 6/13/2012 10:37:48 A.M. Central Daylight Time,=20 gbfitz@swbell.net writes:

=

Does the Airflow Performance fuel injection use an= =20 engine-powered pump, or does it rely on the electrical pump for fuel deli= very=20 all the time? Is there a difference in the principle of operation o= f=20 this system compared to the standard Lycoming fuel injection system or th= e=20 Silver Hawk system?

Gary Fitzgerald

LNC2 ~70%

St. Charles, MO

Looking for a good deal on

a used or rebuildable (I)O-360

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