X-Virus-Scanned: clean according to Sophos on Logan.com X-SpamCatcher-Score: 2 [X] Return-Path: Sender: To: lml@lancaironline.net Date: Wed, 02 May 2007 10:32:58 -0400 Message-ID: X-Original-Return-Path: Received: from elasmtp-galgo.atl.sa.earthlink.net ([209.86.89.61] verified) by logan.com (CommuniGate Pro SMTP 5.1.8) with ESMTP id 2021247 for lml@lancaironline.net; Wed, 02 May 2007 08:56:23 -0400 Received-SPF: none receiver=logan.com; client-ip=209.86.89.61; envelope-from=rtitsworth@mindspring.com DomainKey-Signature: a=rsa-sha1; q=dns; c=nofws; s=dk20050327; d=mindspring.com; b=A5vQItHO0vgpnGVpK3N8xRdiX5u0Eify3HijXut5AUxQ41Ly23MRgPQoFv5qkb/L; h=Received:From:To:Subject:Date:Message-ID:MIME-Version:Content-Type:Content-Transfer-Encoding:X-Mailer:In-Reply-To:X-MimeOLE:thread-index:X-ELNK-Trace:X-Originating-IP; Received: from [69.3.253.252] (helo=RDTVAIO) by elasmtp-galgo.atl.sa.earthlink.net with asmtp (Exim 4.34) id 1HjDzZ-000522-S9 for lml@lancaironline.net; Wed, 02 May 2007 08:31:34 -0400 From: "rtitsworth" X-Original-To: "'Lancair Mailing List'" Subject: RE: [LML] Re: More Power X-Original-Date: Wed, 2 May 2007 08:31:23 -0400 X-Original-Message-ID: <015c01c78cb5$cbf579a0$6600a8c0@RDTVAIO> MIME-Version: 1.0 Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: 7bit X-Mailer: Microsoft Office Outlook 11 In-Reply-To: X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.3028 thread-index: AceMZUpUIY0IHsnoQWur8l9ZNvDfFQATYxkw X-ELNK-Trace: b17f11247b2ac8f0a79dc4b33984cbaa0a9da525759e2654ad17ce999da3b1c0aaa3ad72168f948c5bff31af8927e75a350badd9bab72f9c350badd9bab72f9c X-Originating-IP: 69.3.253.252 In addition to RPM and Boost factors, compression ratio also comes into play. Higher compression ratios = higher power (and efficiency) but also lead to detonation if you can't keep the cylinder/head/piston cool enough. Liquid cooling can provide added cooling capability at the cost of weight/complexity and typically radiator drag. The Trace/Orenda web pic's don't show any radiators. I'd be very interested in seeing those. p.s. I've often wondered why someone hasn't designed/built an air cooled cylinder head with added oil jackets/galleys in the heads to provide added liquid cooling capability via oil (with an enlarged oil cooler as necessary). The oil cooling may not be ideal, but would seem to be a compromise between air and water/ethyleneglycol with minimal added complexity - especially if it were just used to augment air cooling at the hottest locations (e.g. around the exhaust values, etc). -----Original Message----- From: Lancair Mailing List [mailto:lml@lancaironline.net] On Behalf Of Rob Logan hmm, I'm confused, this is 495 cubic inches.. the TSIO-550 is bigger so it can pump more air, so with a stoichiometric mixture one would be burning more fuel... and isn't that faster?