Return-Path: Received: from pop3.olsusa.com ([63.150.212.2] verified) by logan.com (CommuniGate Pro SMTP 3.5.4) with ESMTP id 1041990 for rob@logan.com; Wed, 06 Feb 2002 22:55:00 -0500 Received: from imo-r01.mx.aol.com ([152.163.225.97]) by pop3.olsusa.com (Post.Office MTA v3.5.3 release 223 ID# 0-71866U8000L800S0V35) with ESMTP id com for ; Wed, 6 Feb 2002 21:46:55 -0500 Received: from Sky2high@aol.com by imo-r01.mx.aol.com (mail_out_v32.5.) id k.a0.21d16634 (1321) for ; Wed, 6 Feb 2002 21:48:49 -0500 (EST) From: Sky2high@aol.com Message-ID: Date: Wed, 6 Feb 2002 21:48:48 EST Subject: Re: Air injection???? To: lancair.list@olsusa.com MIME-Version: 1.0 Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: 7bit X-Mailing-List: lancair.list@olsusa.com Reply-To: lancair.list@olsusa.com <<<<<<<<<<<<<<<<--->>>>>>>>>>>>>>>> << Lancair Builders' Mail List >> <<<<<<<<<<<<<<<<--->>>>>>>>>>>>>>>> >> Adam, You wrote <... how can air flowing around an injector affect its fuel flow? Is the air leaking into the injector at the fitting??> Considering the dearth of replies, you must not be alone. Close inspection of any injector body will reveal a screen to protect particles from entering the injector along with the small amount of air used to help atomize the fuel. Also note that injector installation usually requires that the letter stamped on a face of the hex area is to point up (or down, I don't remember which) so that the air hole is facing up to lessen fuel leaking out after the engine is stopped (a small amount in any event). Air entering the upper engine cooling plenum does so at a speed in excess of 200 mph (remember that a high power leaf blower only gets the air up to 150 mph (a good one, that is). If different injector atomizer air holes are subject to different air flows and pressures, the atomization of the fuel can also be different resulting in uneven fuel/air ratios. Note that the #2 injector is the first thing to see incoming air. It may be that even the position of the air hole is important. Another example is that turbo/super-charged engines use special shrouded injectors supplied with deck pressure air to reflect the artificially raised manifold pressure (as opposed to ambient pressure) to supply atomized fuel at a known and repeatable rate. I hope this helps, Scott Krueger >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> LML website: http://members.olsusa.com/mkaye/maillist.html LML Builders' Bookstore: http://www.buildersbooks.com/lancair Please remember that purchases from the Builders' Bookstore assist with the management of the LML. Please send your photos and drawings to marvkaye@olsusa.com. >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>