X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Sun, 27 May 2007 22:04:53 -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 2070508 for lml@lancaironline.net; Sun, 27 May 2007 21:31:46 -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: Ao8CAO/NWUZAMf4VeWdsb2JhbACCLjWNGAEBCQ4s X-IronPort-AV: E=Sophos;i="4.14,585,1170655200"; d="scan'208,217";a="15107877" Received: from rs5.liveoakhosting.com (HELO secure5.liveoakhosting.com) ([64.49.254.21]) by ironport5.liveoakmail.com with ESMTP; 27 May 2007 20:31:09 -0500 Received: (qmail 9381 invoked from network); 27 May 2007 20:31:09 -0500 Received: from ip68-108-233-213.br.br.cox.net (HELO ?10.0.1.3?) (68.108.233.213) by rs5.liveoakhosting.com with (AES128-SHA encrypted) SMTP; 27 May 2007 20:31:09 -0500 Mime-Version: 1.0 (Apple Message framework v752.3) In-Reply-To: References: Content-Type: multipart/alternative; boundary=Apple-Mail-2-145172609 X-Original-Message-Id: <2E1DD296-8596-4E03-AF82-104EFA2CBF27@advancedpilot.com> From: Walter Atkinson Subject: Re: [LML] Re: TSIO 550 LOP X-Original-Date: Sun, 27 May 2007 20:30:35 -0500 X-Original-To: "Lancair Mailing List" X-Mailer: Apple Mail (2.752.3) --Apple-Mail-2-145172609 Content-Transfer-Encoding: 7bit Content-Type: text/plain; charset=US-ASCII; delsp=yes; format=flowed Craig: Many of the TSIO-550s with the 7.5:1 CR will be set at 24 degree timing, making them very close to the 8.5:1 CR engines in BSFC. Don't forget to throw that into the mix. These have about a 14.7 multiplier instead of the 14.9 of the 8.5s. Walter On May 27, 2007, at 4:43 PM, Craig Berland wrote: Paul Tackabury wrote: A repeat question--I was probably a bit too obtuse with the first try: We have at lease two configs of TSIO-550s out there (7.5 and 8.5 CR) and many interpretations of LIV(P)s. If they are run at the same fuel flow LOP then to the first order they are making the same horsepower. If their airspeed indicator/pitot static systems are reasonably accurate then a comparison of indicated airspeed should give an idea of relative efficiency and how the breed is evolving. So if we operate our TCM dollar eaters at 17.5 gph LOP as Walter suggests is typical on some airframes, then what sort of KIAS are we seeing? Mine was 211 KIAS before paint and as I stated I am hoping for an increase of about 4 knots after paint. I hope to have the reassembly complete this coming week and will share the results. Paul, I hope you get some detailed answers to your question of speed, however the answers are somewhat suspect as some folks compensate for temperature and others use a standard airspeed gage. I do want to point out that a 8.5 C/R will make slightly more power if all other variables are held constant. The higher compression ratio is slightly more efficient. The higher ratio is not a freebie as you need to be somewhat more concerned about higher cylinder pressures and detonation. What FL are you seeing 211 kts? Craig Berland --Apple-Mail-2-145172609 Content-Transfer-Encoding: quoted-printable Content-Type: text/html; charset=ISO-8859-1 Craig:

Many of the TSIO-550s with = the 7.5:1 CR will be set at 24 degree timing, making them very close to = the 8.5:1 CR engines in BSFC. Don't forget to throw that into the mix. = <g>=A0 These have about a 14.7 multiplier instead of the 14.9 of = the 8.5s.

Walter

On May 27, = 2007, at 4:43 PM, Craig Berland wrote:

Paul Tackabury = wrote:

A repeat = question--I was probably a bit too obtuse with the first try:=A0 We have = at lease two configs of TSIO-550s out there (7.5 and 8.5 CR) and many = interpretations of LIV(P)s.=A0 If they are run at the same fuel flow LOP = then to the first order they are making the same horsepower.=A0 If their = airspeed indicator/pitot static systems are reasonably accurate then a = comparison of indicated airspeed should give an idea of relative = efficiency and how the breed is evolving.=A0 So if we operate our TCM = dollar eaters at 17.5 gph LOP as Walter suggests is typical on some = airframes, then what sort of KIAS are we seeing?=A0 Mine was 211 KIAS = before paint and as I stated I am hoping for an increase of about 4 = knots after paint.=A0 I hope to have the reassembly complete this coming = week and will share the results.

=A0

Paul, I = hope you get some detailed answers to your question of speed, however = the answers are somewhat suspect as some folks compensate for = temperature and others use a=A0standard airspeed gage.=A0 I do want to = point out that a 8.5 C/R will make slightly more power if all other = variables are held constant.=A0 The higher compression ratio is slightly = more efficient.=A0 The higher ratio is not a freebie as you need to be = somewhat more concerned about higher cylinder pressures and detonation.=A0= What FL are you seeing 211 kts?

Craig Berland=A0=A0

=

=A0

= --Apple-Mail-2-145172609--