Return-Path: Received: from fed1rmmtai11.cox.net ([68.230.241.48] verified) by logan.com (CommuniGate Pro SMTP 4.2b5) with ESMTP id 153131 for flyrotary@lancaironline.net; Tue, 15 Jun 2004 02:34:24 -0400 Received: from davidandanne ([68.111.224.107]) by fed1rmmtao08.cox.net (InterMail vM.6.01.03.02 201-2131-111-104-20040324) with SMTP id <20040614063915.AUW19076.fed1rmmtao08.cox.net@davidandanne> for ; Mon, 14 Jun 2004 02:39:15 -0400 From: "DaveLeonard" To: "Rotary motors in aircraft" Subject: RE: [FlyRotary] Pressure Reduction Was Re: [FlyRotary] Re: Some Taxi testing today. With oil leak. Date: Sun, 13 Jun 2004 23:39:29 -0700 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) Importance: Normal In-Reply-To: X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1409 Ed, thanks, that's good input. However, remember that the pressure drop will depend on the flow rate. After taking your lead, I looked at Corky's book and read his discussion. He recommends a .055-.065 restriction. That is quite small. I decided to try a 5/32 hole today with no improvement in leak. Then I just poured some oil in the top of the turbo and got a leak, so it is going back to the "re-builder" and my first flight is delayed another few weeks. At least it was fun to get the tail up on the runway. :) Dave Leonard ____________________________________ Dave, a calculator I found on the Web indicated that with oil going from a 3/8" dia (AN-6) through a 1/8" orifice would reduce the pressure by approx 40 psi. So if your engine is putting out 70-80 psi that would bring it down to the 30-40psi range which should be acceptable. Ed Ed Anderson RV-6A N494BW Rotary Powered Matthews, NC >> Homepage: http://www.flyrotary.com/ >> Archive: http://lancaironline.net/lists/flyrotary/List.html