X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Tue, 29 May 2007 16:46:14 -0400 Message-ID: X-Original-Return-Path: Received: from ironport5.liveoakmail.com ([216.110.12.21] verified) by logan.com (CommuniGate Pro SMTP 5.1.9) with ESMTP id 2073404 for lml@lancaironline.net; Tue, 29 May 2007 15:57:43 -0400 Received-SPF: none receiver=logan.com; client-ip=216.110.12.21; envelope-from=walter@advancedpilot.com X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: Ao8CAGoiXEZAMf4VeWdsb2JhbACCY40bAgkOLA X-IronPort-AV: E=Sophos;i="4.14,589,1170655200"; d="scan'208,217";a="15411880" Received: from rs5.liveoakhosting.com (HELO secure5.liveoakhosting.com) ([64.49.254.21]) by ironport5.liveoakmail.com with ESMTP; 29 May 2007 14:57:07 -0500 Received: (qmail 19998 invoked from network); 29 May 2007 14:57:06 -0500 Received: from 216-107-97-170.wan.networktel.net (HELO ?10.0.1.3?) (216.107.97.170) by rs5.liveoakhosting.com with (AES128-SHA encrypted) SMTP; 29 May 2007 14:57:06 -0500 Mime-Version: 1.0 (Apple Message framework v752.3) In-Reply-To: References: Content-Type: multipart/alternative; boundary=Apple-Mail-6-297920995 X-Original-Message-Id: <911D6C8A-578D-4143-81A2-EEC5084473C6@advancedpilot.com> From: Walter Atkinson Subject: Re: [LML] Re: TSIO 550 LOP X-Original-Date: Tue, 29 May 2007 14:56:23 -0500 X-Original-To: "Lancair Mailing List" X-Mailer: Apple Mail (2.752.3) --Apple-Mail-6-297920995 Content-Transfer-Encoding: 7bit Content-Type: text/plain; charset=US-ASCII; delsp=yes; format=flowed AARRRGH! I said it backwards! Good catch. A faster RPM moves the thetaPP later---makes for a higher EGT--less expansion. Sorry, but as you all know, stupid is as stupid does!!!!! As for the timing change, think about what that does to the thetaPP. On May 29, 2007, at 2:46 PM, Colyn Case on earthlink wrote: Walter said, RPM: Higher RPM move the EFFECTIVE timing closer to TDC. This results in more expansion = lower EGT. Walter, I understand why higher rpm moves the effective timing LATER but I don't understand why that results in "more expansion" ...also & btw I didn't understand why 7.5:1 timing being two degrees earlier improves the relative bsfc to the 8.5:1 Colyn --Apple-Mail-6-297920995 Content-Transfer-Encoding: quoted-printable Content-Type: text/html; charset=ISO-8859-1 AARRRGH!=A0 I said it = backwards!=A0 Good catch.

A faster RPM moves the = thetaPP later---makes for a higher EGT--less expansion.

Sorry, but as you all know, = stupid is as stupid does!!!!!

As for the timing change, = think about what that does to the thetaPP.

On May 29, = 2007, at 2:46 PM, Colyn Case on earthlink wrote:

Higher RPM = move the EFFECTIVE timing closer to TDC.=A0 This results in more = expansion =3D lower EGT.

=A0

Walter,=A0 I understand why higher rpm moves the = effective timing LATER

but I don't understand why that results in "more = expansion"

=A0

= --Apple-Mail-6-297920995--