X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Mon, 19 Oct 2009 13:37:35 -0400 Message-ID: X-Original-Return-Path: Received: from omr17.networksolutionsemail.com ([205.178.146.67] verified) by logan.com (CommuniGate Pro SMTP 5.2.16) with ESMTP id 3891003 for lml@lancaironline.net; Mon, 19 Oct 2009 11:30:30 -0400 Received-SPF: none receiver=logan.com; client-ip=205.178.146.67; envelope-from=steve@oasissolutions.com Received: from mail.networksolutionsemail.com (ns-omr17.mgt.hosting.dc2.netsol.com [10.49.6.80]) by omr17.networksolutionsemail.com (8.13.6/8.13.6) with SMTP id n9JFTu49026223 for ; Mon, 19 Oct 2009 11:29:56 -0400 Received: (qmail 17697 invoked by uid 78); 19 Oct 2009 15:29:55 -0000 Received: from unknown (HELO main) (steve@oasissolutions.com@24.5.211.60) by ns-omr17.lb.hosting.dc2.netsol.com with SMTP; 19 Oct 2009 15:29:55 -0000 From: "Steve Richard" X-Original-To: "'Lancair Mailing List'" References: Subject: RE: [LML] Re: LOP MP setting for TSIO-550E X-Original-Date: Mon, 19 Oct 2009 08:29:46 -0700 X-Original-Message-ID: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit X-Mailer: Microsoft Office Outlook 11 thread-index: AcpQvr7iNyAbQqjuTnW1FUMgSFFRegAD1GEA X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.5579 In-Reply-To: I have the small rectangular opening in front of #5. Steve -----Original Message----- From: Lancair Mailing List [mailto:lml@lancaironline.net] On Behalf Of Jeffrey Liegner, MD Sent: Monday, October 19, 2009 6:19 AM To: lml@lancaironline.net Subject: [LML] Re: LOP MP setting for TSIO-550E 13.7 hp/gph for TSIO-550E 17.5 gph 240 HP = 68% (roughly) At 20gph ROP, you were sending 2.5 gallons per hour of 100LL out the exhaust manifold (unused). 14% greater carbon footprint without any benefit. Now try 34" 2500 18.0gph which is where I run often. Notice cyl 5 is hottest. Ususally it's cyl 2. Do you have the small rectangular cut opening in front of cyl 5? Jeff L LIVP >In the original email, i asked what MP one should use when running LOP. >George Braly suggested i go out and find out for myself. So I did. > >Here are two runs, both LOP at 2500 RPM and 17.5 GPH lean of peak: > >30" MAP >EGT 1558 1558 1576 1563 1528 1484 CHT 330 328 332 328 340 >324 TIT 1593 / 1634 > >31.6 MAP >EGT 1542 1544 1556 1540 1514 1472 CHT 326 322 326 324 326 >314 TIT 1578 / 1611 > >The IAS in both cases was the same, so the horsepower must have been >the same. As one can see, higher MP means cooler temperatures. >Which makes sense, since the mixture is leaner. I think I'm concluding >that one sets the fuel flow to pick the horsepower desired, and then >adjusts the MP to get the temperature desired (within reason). > >I thought 17.5 LOP would be about 75% power. So I went ROP and reduced >MP until i got the same IAS as the LOP runs above. It took 27" MAP and >20 GPH to match the IAS, which I think is about 65% power (don't know >why it isn't 75%...) > >-isaac >N7842K ES-P -- For archives and unsub http://mail.lancaironline.net:81/lists/lml/List.html