X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Tue, 18 Apr 2006 12:26:44 -0400 Message-ID: X-Original-Return-Path: Received: from elasmtp-junco.atl.sa.earthlink.net ([209.86.89.63] verified) by logan.com (CommuniGate Pro SMTP 5.0.9) with ESMTP id 1071701 for lml@lancaironline.net; Tue, 18 Apr 2006 01:39:09 -0400 Received-SPF: none receiver=logan.com; client-ip=209.86.89.63; envelope-from=rtitsworth@mindspring.com DomainKey-Signature: a=rsa-sha1; q=dns; c=nofws; s=dk20050327; d=mindspring.com; b=UU+BtKoyZbWUSgCBhf8VprM9XvNKmkcKF1Lh8D7H4wWxmm/cnlmfB8kebFSf/xSO; h=Received:Reply-To:From:To:Subject:Date:MIME-Version:Content-Type:X-Mailer:Thread-Index:In-Reply-To:X-MimeOLE:Message-ID:X-ELNK-Trace:X-Originating-IP; Received: from [68.40.94.44] (helo=RDTVAIO) by elasmtp-junco.atl.sa.earthlink.net with asmtp (Exim 4.34) id 1FViuq-0003ir-Ai for lml@lancaironline.net; Tue, 18 Apr 2006 01:38:20 -0400 Reply-To: From: "richard titsworth" X-Original-To: "'Lancair Mailing List'" Subject: RE: [LML] Re: TSIO-550 Turbo setup for non-pressurizedLlancairs X-Original-Date: Tue, 18 Apr 2006 01:38:11 -0400 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0006_01C66288.C0B32CC0" X-Mailer: Microsoft Office Outlook, Build 11.0.5510 Thread-Index: AcZioa5KuOm+yuF9TSihb0fA7AhvDAABiANA In-Reply-To: X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.2869 X-Original-Message-ID: X-ELNK-Trace: b17f11247b2ac8f0a79dc4b33984cbaa0a9da525759e265448812a653c240e15ccda43d2c15d81c0396bf6a0aafa7dc0350badd9bab72f9c350badd9bab72f9c X-Originating-IP: 68.40.94.44 This is a multi-part message in MIME format. ------=_NextPart_000_0006_01C66288.C0B32CC0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Brent, Thanks for the insight/experience! Do you know what specific turbo components you're running (make, model, size, specs, etc) - or is it a racers secret?? Although the LYC540 and TCM550 are obviously different, I'm not sure the turbos (and related systems) would behave much differently given the similar displacement, RPM, and HP (unverified)?) If so, your turbo system/setup is of interest to me. Is your system/setup able to maintain 35" MP to 25,000+ ft? Are you pressurized? If not, does your setup have bleed air nozzles? If it does have bleed air, is it dumped overboard when not heating (or pressurizing) or is it capped? Do you cruise LOP? Based on your knowledge of other (std) TSIO-550's, do you believe your 21 GPH to be approx the same, better, or worst economy? Rick Titsworth rtitsworth@mindspring.com 313-506-5604 p.s. Brent, thanks again for your comments. I noted you had several interesting turbo/engine posts in the old LML archives when I initially went back through them. _____ From: Lancair Mailing List [mailto:lml@lancaironline.net] On Behalf Of Brent Regan Sent: Tuesday, April 18, 2006 12:37 AM To: Lancair Mailing List Subject: [LML] Re: TSIO-550 Turbo setup for non-pressurizedLlancairs Back in '93, when I was designing the Lycoming engine installation for my IV-P, I was asking the same questions about compression ratio. In researching the topic and talking to engineers at Lycoming and Continental I uncovered an interesting fact; the exhaust system is frequently considered part of the airframe and not part of the engine. In those cases, the design of the exhaust system is the responsibility of the aircraft manufacturer, not the engine manufacturer. This caused the engine manufacturers to be very conservative regarding detonation margins and therefore, compression ratios. My investigation and analysis lead to the conclusion that a higher compression ratio (8.5 :1) and lower max manifold pressure (35 inches) combined with intercoolers would result in an engine with superior thermodynamic efficiency and lower exhaust temperatures. I hired a retired Garret engineer (designer of the Mirage turbo installation) to assist in selecting specific components (turbos, waste gate, controller and relief valve). I designed an Oil Sump with integral engine mounts and Oil Suction Strainer, a Oil Baffle Plate, Tuned Induction Plenum and Intake Runners, Intercoolers, Intercooler Flow Combiner, Turbocharger Mounting Brackets, Exhaust System, Baffling and ducting. I integrated the components on a used IO540 K series engine core and sent the assembly to Barrett Performance Aircraft for overhaul and dyno testing. The BPA SAE calibrated dyno test data shows the engine producing 360 HP at 2700 RPM and 35 inches MP. Power tests were run 150 degrees rich and TIT never exceeded 1500 degrees. Monty Barrett was impressed by the engine and still features a picture of it in his print ads in TAP. After nearly a dozen years and over 900 flight hours (and several races) I can report that the engine is still going strong with all of its original parts. Compression is still in the mid 70s. I cruise at 75% power, 2,500 RPM, 28 IMP and 21 GPH. A couple of years ago I shared the details of this installation and flight experience with the engineers that went on to produce an STCed high compression and sealed plenum modification for the Mirage. My experience with the higher compression ratio and lower maximum manifold pressure has been positive however I must caution that the ultimate success of an installation is determined by the details of the design, not the "big" parameters like compression ratio. Regards Brent Regan ------=_NextPart_000_0006_01C66288.C0B32CC0 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Brent,

 

Thanks for the = insight/experience! 

 

Do you know what specific turbo = components you’re running (make, model, size, specs, etc) – or is it a = racers secret??

 

Although the LYC540 and TCM550 are obviously different, I’m not sure the turbos (and related systems) = would behave much differently given the similar displacement, RPM, and HP (unverified)?)  If so, your turbo system/setup is of interest to = me.

 

Is your system/setup able to = maintain 35” MP to 25,000+ ft?

 

Are you pressurized?  If not, = does your setup have bleed air nozzles?  If it does have bleed air, is = it dumped overboard when not heating (or pressurizing) or is it = capped?

 

Do you cruise LOP?  Based on = your knowledge of other (std) TSIO-550’s, do you believe your 21 GPH to = be approx the same, better, or worst economy?

 

Rick = Titsworth

rtitsworth@mindsp= ring.com

313-506-5604

 

p.s. Brent, thanks again for your comments.  I noted you had several interesting turbo/engine posts = in the old LML archives when I initially went back through = them.

 

From: Lancair Mailing = List [mailto:lml@lancaironline.net] On = Behalf Of Brent Regan
Sent: Tuesday, April 18, = 2006 12:37 AM
To: Lancair Mailing List
Subject: [LML] Re: = TSIO-550 Turbo setup for non-pressurizedLlancairs

 

Back in = '93, when I was designing the Lycoming engine installation for my IV-P,  I was = asking the same questions about compression ratio. In researching the topic and talking to engineers at Lycoming and Continental I uncovered an = interesting fact; the exhaust system is frequently considered part of the airframe = and not part of the engine. In those cases, the design of the exhaust system is = the responsibility of the aircraft manufacturer, not the engine = manufacturer. This caused the engine manufacturers to be very conservative regarding = detonation margins and therefore, compression ratios.

My investigation and analysis lead to the conclusion that a higher = compression ratio (8.5 :1) and lower max manifold pressure (35 inches) combined with intercoolers would result in an engine with superior thermodynamic = efficiency and lower exhaust temperatures. I hired a retired Garret engineer = (designer of the Mirage turbo installation) to assist in selecting specific = components (turbos, waste gate, controller and relief valve). I  designed = an  Oil Sump with integral engine mounts and Oil Suction Strainer, a Oil = Baffle Plate, Tuned Induction Plenum and Intake Runners, Intercoolers, = Intercooler Flow Combiner, Turbocharger Mounting Brackets,  Exhaust System, = Baffling and ducting.

I integrated the components on a used IO540 K series engine core and = sent the assembly to Barrett Performance Aircraft  for overhaul and dyno = testing. The BPA SAE calibrated dyno test data shows the engine producing 360 HP = at 2700 RPM and 35 inches MP. Power tests were run 150 degrees rich and TIT = never exceeded 1500 degrees.  Monty Barrett was impressed by the engine = and still features a picture of it in his print ads in TAP. After nearly a = dozen years and over 900 flight hours (and several races) I can report = that  the engine is still going strong with all of its original parts. Compression = is still in the mid 70s. I  cruise at 75% power, 2,500 RPM, 28 IMP and = 21 GPH.

A couple of years ago I shared the details of this installation and = flight experience with the engineers that  went on to produce an STCed = high compression and sealed plenum modification for the Mirage.

My experience with the higher compression ratio and lower maximum = manifold pressure has been positive however I must caution that the ultimate = success of an installation is determined by the details of the design, not the "big" parameters like compression ratio.

Regards
Brent Regan

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