X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Fri, 26 Aug 2011 18:38:01 -0400 Message-ID: X-Original-Return-Path: Received: from elasmtp-masked.atl.sa.earthlink.net ([209.86.89.68] verified) by logan.com (CommuniGate Pro SMTP 5.4.1) with ESMTP id 5103752 for lml@lancaironline.net; Thu, 25 Aug 2011 13:44:30 -0400 Received-SPF: none receiver=logan.com; client-ip=209.86.89.68; envelope-from=colyncase@earthlink.net DomainKey-Signature: a=rsa-sha1; q=dns; c=nofws; s=dk20050327; d=earthlink.net; b=SaRS2UsWhnG0k76RKGz0Mpa52HKLSyyQMp1T1GVF5UWqiB+E+u1yb+OBReF33Zlf; h=Received:From:Mime-Version:Content-Type:Subject:Date:In-Reply-To:To:References:Message-Id:X-Mailer:X-ELNK-Trace:X-Originating-IP; Received: from [70.20.47.85] (helo=[192.168.1.24]) by elasmtp-masked.atl.sa.earthlink.net with esmtpa (Exim 4.67) (envelope-from ) id 1Qwdy7-0004RG-1f for lml@lancaironline.net; Thu, 25 Aug 2011 13:43:55 -0400 From: Colyn Case Mime-Version: 1.0 (Apple Message framework v1084) Content-Type: multipart/alternative; boundary=Apple-Mail-76-979585704 Subject: Re: [LML] LOP effect on CHT X-Original-Date: Thu, 25 Aug 2011 13:43:54 -0400 In-Reply-To: X-Original-To: "Lancair Mailing List" References: X-Original-Message-Id: <5DE50472-4473-441E-B1B9-DEB9AF43B51B@earthlink.net> X-Mailer: Apple Mail (2.1084) X-ELNK-Trace: 63d5d3452847f8b1d6dd28457998182d7e972de0d01da940ff87d404fdae3f58d779f3d4c641b1c6350badd9bab72f9c350badd9bab72f9c350badd9bab72f9c X-Originating-IP: 70.20.47.85 --Apple-Mail-76-979585704 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=us-ascii Well, one issue is you would like your oil hot enough to boil the water = off. On Aug 25, 2011, at 10:48 AM, Art Jensen wrote: > It is true that running LOP will cause the engine to run cooler. As = you all know the Legacy doesn't have cowl flaps. I built my Legacy with = inlets in the cowl that are 1/4 inch smaller in diameter to reduce = cooling drag, tightened up the baffling to make use of all the cooling = air and I find that running LOP at altitude my CHT's will run from 278 = to 300 degrees. Since I could not find anything published regarding how = cool you can run the engine, I asked a tech rep. from Continental how = cool you can run the IO-550 engine and what damage would result should I = do so. He indicated that that's the reason you don't find a published = number. Is that possible? >=20 > At the temps mentioned above, my oil temp is 180 degrees. >=20 > So, I would like to hear from you regarding your thoughts on this = subject. Thanks for your input. >=20 > Art Jensen >=20 > From: Walter Atkinson ;=20 > To: ;=20 > Subject: [LML] Re: How do I run lean of peak?=20 > Sent: Mon, Aug 22, 2011 5:28:42 PM=20 >=20 >=20 > But what is your actual hourly saving and is it worth the additional = stress on your engines for the potentially much lower TBO? You decide = and your mileage may vary. >=20 >=20 > 400 million hours of flight data supports the fact that when run ROP, = the TC-18 radial on the DC-7s had a TBO of 600 hours. When run LOP it = had a TBO of 3600 hours. Yep, 3 thousand 6 hundred vs. 6 hundred hours. --Apple-Mail-76-979585704 Content-Transfer-Encoding: quoted-printable Content-Type: text/html; charset=us-ascii Well, = one issue is you would like your oil hot enough to boil the water = off.

On Aug 25, 2011, at 10:48 AM, Art Jensen = wrote:

It is true that running LOP will cause the engine to run = cooler. As you all know the Legacy doesn't have cowl flaps. I built my = Legacy with inlets in the cowl that are 1/4 inch smaller in diameter to = reduce cooling drag, tightened up the baffling to make use of all the = cooling air and I find that running LOP at altitude my CHT's will run = from 278 to 300 degrees. Since I could not find anything published = regarding how cool you can run the engine, I asked a tech rep. from = Continental how cool you can run the IO-550 engine and what damage would = result should I do so. He indicated that that's the reason you don't = find a published number. Is that possible?

At the temps = mentioned above, my oil temp is 180 degrees.

So, I would like to = hear from you regarding your thoughts on this subject. Thanks for your = input.

Art Jensen

From: Walter Atkinson <walter@advancedpilot.com>;=
To: <lml@lancaironline.net>; = =
Subject: [LML] Re: How do I run lean of peak? =
Sent: Mon, Aug 22, 2011 5:28:42 PM =


But what is your actual hourly = saving and is it worth the additional stress on your engines for the = potentially much lower TBO? You decide and your mileage may = vary.


400 = million  hours of flight data supports the fact that when run ROP, = the TC-18 radial on the DC-7s had a TBO of 600 hours.  When run LOP = it had a TBO of 3600 hours.  Yep, 3 thousand 6 hundred vs. 6 = hundred hours.

= --Apple-Mail-76-979585704--