Return-Path: Sender: (Marvin Kaye) To: lml@lancaironline.net Date: Sun, 08 Feb 2004 18:48:49 -0500 Message-ID: X-Original-Return-Path: Received: from [64.4.19.115] (HELO hotmail.com) by logan.com (CommuniGate Pro SMTP 4.1.8) with ESMTP id 2982295 for lml@lancaironline.net; Sun, 08 Feb 2004 10:25:05 -0500 Received: from mail pickup service by hotmail.com with Microsoft SMTPSVC; Sun, 8 Feb 2004 07:13:06 -0800 Received: from 68.97.133.211 by lw12fd.law12.hotmail.msn.com with HTTP; Sun, 08 Feb 2004 15:13:06 GMT X-Originating-IP: [68.97.133.211] X-Originating-Email: [ronlaughlin@hotmail.com] X-Sender: ronlaughlin@hotmail.com From: "Ron Laughlin" X-Original-To: lml@lancaironline.net X-Original-Bcc: Subject: RE: [LML] Re: LOP Horse power formula, the correct one X-Original-Date: Sun, 08 Feb 2004 09:13:06 -0600 Mime-Version: 1.0 Content-Type: text/plain; format=flowed X-Original-Message-ID: X-OriginalArrivalTime: 08 Feb 2004 15:13:06.0857 (UTC) FILETIME=[0E277190:01C3EE56] Hi Ron, Sorry but I think you may be confused on the compression ratios. The normally aspirated IO-550 has 8.5:1 pistons. The TSIO-550 (and most other turbocharged Continentals) have 7.5:1 pistons. From John Deakin/ AvWeb (Pelican's Perch #35) "Those Fire Breathing Turbo's (part 5): "However, if you really, really must know the HP you're pulling, there's an incredibly simple trick to find out. On the flat, horizontally opposed, air-cooled aircraft engines with 8.5:1 compression ratios (including TCM IO-520/550 and Lycoming IO-540), simply multiply fuel flow in GPH times 14.9. The result is HP. If you insist on percent, divide that by the rated power of the engine. For the same engines with 7.5:1 compression ratio (most factory-installed turbos), the numbers are worse, and the multiplier drops to about 13.7." Ref: Ron Laughlin Legacy 156 _________________________________________________________________ Let the advanced features & services of MSN Internet Software maximize your online time. http://click.atdmt.com/AVE/go/onm00200363ave/direct/01/