X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from fed1rmmtao05.cox.net ([68.230.241.34] verified) by logan.com (CommuniGate Pro SMTP 5.0) with ESMTP id 813200 for flyrotary@lancaironline.net; Thu, 03 Nov 2005 08:32:13 -0500 Received-SPF: none receiver=logan.com; client-ip=68.230.241.34; envelope-from=dale.r@cox.net Received: from smtp.west.cox.net ([172.18.180.55]) by fed1rmmtao05.cox.net (InterMail vM.6.01.05.02 201-2131-123-102-20050715) with SMTP id <20051103133045.YXZA29333.fed1rmmtao05.cox.net@smtp.west.cox.net> for ; Thu, 3 Nov 2005 08:30:45 -0500 X-Mailer: Openwave WebEngine, version 2.8.15 (webedge20-101-1103-20040528) From: Dale Rogers To: "Rotary motors in aircraft" Subject: Re: [FlyRotary] Another Run - with Questions Date: Thu, 3 Nov 2005 8:30:29 -0500 MIME-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Message-Id: <20051103133045.YXZA29333.fed1rmmtao05.cox.net@smtp.west.cox.net> Joe Hull asked: > 1. Engine starts out at about 1300RPM at idle when cold and Oil > PSI briefly is 81PSI and then drops to 65 or so after 15-20 seconds. > Then as things warm up the RPM's increase and oil pressure drops. RPM > levels out at about 1550 and oil pressure hovers around 30PSI. Is > 30PSI an OK oil pressure level at that RPM? I did increase the RPM > briefly toward the end of the hour and oil pressure did go up. At > 1900-2000 RPM oil pressure was around 50PSI. That startup sequence is pretty typical of automotive ECU's. IIRC, the Mazda "rule of thumb" for oil pressure indicates that 30 PSI will provide adequate lubrication up to 3000 RPM. Dale R.