X-Virus-Scanned: clean according to Sophos on Logan.com X-SpamCatcher-Score: 30 [X] Return-Path: Sender: To: lml@lancaironline.net Date: Mon, 19 Mar 2007 15:50:16 -0400 Message-ID: X-Original-Return-Path: Received: from global.delionsden.com ([66.150.29.112] verified) by logan.com (CommuniGate Pro SMTP 5.1.7) with ESMTPS id 1930886 for lml@lancaironline.net; Mon, 19 Mar 2007 15:31:20 -0400 Received-SPF: none receiver=logan.com; client-ip=66.150.29.112; envelope-from=n103md@yahoo.com Received: from bmackey by global.delionsden.com with local (Exim 4.62) (envelope-from ) id 1HTNYl-0006sB-Ht for lml@lancaironline.net; Mon, 19 Mar 2007 14:30:23 -0500 Received: from 12.146.139.19 ([12.146.139.19]) (SquirrelMail authenticated user bmackey) by www.bmackey.com with HTTP; Mon, 19 Mar 2007 11:30:23 -0800 (PST) X-Original-Message-ID: <47800.12.146.139.19.1174332623.squirrel@www.bmackey.com> X-Original-Date: Mon, 19 Mar 2007 11:30:23 -0800 (PST) Subject: carbureted lean-of-peak From: "bob mackey" X-Original-To: lml@lancaironline.net User-Agent: SquirrelMail/1.4.8 MIME-Version: 1.0 Content-Type: text/plain;charset=iso-8859-1 Content-Transfer-Encoding: 8bit X-Priority: 3 (Normal) Importance: Normal X-AntiAbuse: This header was added to track abuse, please include it with any abuse report X-AntiAbuse: Primary Hostname - global.delionsden.com X-AntiAbuse: Original Domain - lancaironline.net X-AntiAbuse: Originator/Caller UID/GID - [32015 2012] / [47 12] X-AntiAbuse: Sender Address Domain - yahoo.com X-Source: X-Source-Args: X-Source-Dir: Lorn writes: > When I fly lean I have a lot of engine vibration because I > am not injected. I can see my whole right wing vibrate because > of the engine. I then enrich a little to stop most of the vibration. The engine is running rough (presumably) because the fuel is not distributed the cylinders evenly. A relatively easy way to ensure uniform fuel distribution is to use injectors that can be adjusted to match each cylinder (ala GAMI). But that's not the only way... carbureted engines can also run smoothly lean-of-peak (LOP). I don't know of any obvious way to adjust the fuel distribution in a carbureted engine, but adjustments to the induction path can have the right effect. On my O-320, there is a flow straightener mounted at the carb inlet in the airbox. It is slightly assymmetric. It can be installed in four possible orientations. It turns out that one of those orientations results in pretty good distribution, allowing the engine to run smoothly LOP. Has anyone else experimented with fuel-flow balancing on single-carburetor aircraft engines?