X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Sun, 02 Dec 2007 11:20:49 -0500 Message-ID: X-Original-Return-Path: Received: from mta2.srv.hcvlny.cv.net ([167.206.4.197] verified) by logan.com (CommuniGate Pro SMTP 5.2c1) with ESMTP id 2551000 for lml@lancaironline.net; Sat, 01 Dec 2007 13:41:50 -0500 Received-SPF: none receiver=logan.com; client-ip=167.206.4.197; envelope-from=Adam@ValidationPartners.com Received: from VpiWorkstation1 (ool-4571b4ad.dyn.optonline.net [69.113.180.173]) by mta2.srv.hcvlny.cv.net (Sun Java System Messaging Server 6.2-8.04 (built Feb 28 2007)) with ESMTP id <0JSD00CFFVVP6140@mta2.srv.hcvlny.cv.net> for lml@lancaironline.net; Sat, 01 Dec 2007 13:40:38 -0500 (EST) X-Original-Date: Sat, 01 Dec 2007 13:41:07 -0500 From: Adam Molny Subject: RE: [LML] Removing ram air duct - Legacy In-reply-to: X-Original-To: lml@lancaironline.net X-Original-Message-id: <0JSD00CFGVVP6140@mta2.srv.hcvlny.cv.net> MIME-version: 1.0 X-MIMEOLE: Produced By Microsoft MimeOLE V6.00.2900.3198 X-Mailer: Microsoft Office Outlook, Build 11.0.6353 Content-type: text/plain; charset=us-ascii Content-transfer-encoding: 7BIT Thread-index: Acg0OhUt/0GWQskMQp6SVGWAnGW0SwADQzJA >With ram air open I would see a 1.5 inch increase in MP but >with it cut it still gets 1.3 inches. > - Art Jensen What would MP be with nothing at all connected to the throttle body? The IO-550N engine air intake is located in the high-pressure side of the intake plenum. Common wisdom says that a ram air duct facing into the slipstream boosts MP, but we already have two big scoops, namely the cooling inlets! Pressure rise from a ram air duct should be nearly identical to the air pressure inside the cowl. Anyone have any thoughts? I'm seriously considering leaving off the ram air tube altogether. Now I just need a way to keep birds and big rocks out of the engine. -Adam Molny, unfiltered (me, not the plane)