Return-Path: Sender: (Marvin Kaye) To: lml@lancaironline.net Date: Tue, 06 Apr 2004 07:26:14 -0400 Message-ID: X-Original-Return-Path: Received: from scaup.mail.pas.earthlink.net ([207.217.120.49] verified) by logan.com (CommuniGate Pro SMTP 4.2b1) with ESMTP id 3147975 for lml@lancaironline.net; Tue, 06 Apr 2004 00:34:03 -0400 Received: from dialup-4.249.114.77.dial1.washington2.level3.net ([4.249.114.77] helo=BobsLaptop) by scaup.mail.pas.earthlink.net with smtp (Exim 3.33 #1) id 1BAiHi-0002pQ-00 for lml@lancaironline.net; Mon, 05 Apr 2004 21:34:03 -0700 Reply-To: From: "Robert Pastusek" X-Original-To: "Lancair Mailing List" Subject: RE: [LML] Induction system X-Original-Date: Tue, 6 Apr 2004 00:38:53 -0400 X-Original-Message-ID: MIME-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook IMO, Build 9.0.2416 (9.0.2910.0) X-MimeOLE: Produced By Microsoft MimeOLE V5.50.4910.0300 Importance: Normal In-Reply-To: Scott Keighan writes: Has anyone come up with an off the shelf or kit for the induction system.... Scott, have you looked at the "automatic" alternate air system specified in the IV construction manual and found it deficient? We've built two IV-P's to the construction manual specs, and although we've not tested ours (birds not yet ready to fly), I (unintentionally) tested this design in a friend's IV-P and it worked as advertised when the air filter apparently iced up. If you use an adequately sized filter, the basic/primary air induction system should provide a ram feed to the engine when at cruise airspeed--and if the pressure in the plenum goes negative (due to filter icing?) the alternate air door will open to feed warm air from around the engine to the engine air inlet. Seems pretty simple and elegant to me. Bob Pastusek