X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Fri, 05 Jul 2013 15:07:59 -0400 Message-ID: X-Original-Return-Path: Received: from mail-pb0-f49.google.com ([209.85.160.49] verified) by logan.com (CommuniGate Pro SMTP 6.0.5) with ESMTPS id 6360310 for lml@lancaironline.net; Wed, 03 Jul 2013 14:31:39 -0400 Received-SPF: pass receiver=logan.com; client-ip=209.85.160.49; envelope-from=pjdmiller@gmail.com Received: by mail-pb0-f49.google.com with SMTP id jt11so391475pbb.8 for ; Wed, 03 Jul 2013 11:31:03 -0700 (PDT) X-Received: by 10.66.163.38 with SMTP id yf6mr2760852pab.34.1372876263398; Wed, 03 Jul 2013 11:31:03 -0700 (PDT) X-Original-Return-Path: Received: from [192.168.1.108] (S010620aa4b008706.cg.shawcable.net. [174.0.112.194]) by mx.google.com with ESMTPSA id eg3sm34753334pac.1.2013.07.03.11.31.01 for (version=TLSv1 cipher=ECDHE-RSA-RC4-SHA bits=128/128); Wed, 03 Jul 2013 11:31:02 -0700 (PDT) Content-Type: text/plain; charset=iso-8859-1 Mime-Version: 1.0 (Mac OS X Mail 6.5 \(1508\)) Subject: Engine storage this summer From: Paul Miller In-Reply-To: X-Original-Date: Wed, 3 Jul 2013 12:30:59 -0600 Content-Transfer-Encoding: quoted-printable X-Original-Message-Id: References: X-Original-To: "Lancair Mailing List" X-Mailer: Apple Mail (2.1508) I am summarizing my practice based on Shell's information about = minimizing corrosion in engines. Protection from Aeroshell oil works = for about two weeks which means to continue protection the engine should = be run that often. It does not appear to be proven that you need = anything more than coating the surfaces so runups are fine as far as I = can tell and flights are not needed for that protection to renew itself. Corrosion from acid is the next problem. Acid forms from combustion and = increases with hours in oil. Engines that sit should have clean oil to = remove that corrosion factor. Additionally, oil should be changed = early so that acids can't accumulate. My experience, backed up with oil analysis numbers, says running every = two weeks minimum and leaving clean oil in for extended periods is the = minimum. Removing water with a dehydrator must be a positive addition = but I don't believe it solves all the problems if the above = recommendations haven't been implemented. I currently use A/S W100, changed after 20 hours and I shoot for 25 = maximum. After 20 hours my wear numbers (ppm metal per hour) go up = faster per hour than under 20 hours. I found this relationship to hold = true for the TSIO engines as well. Leaving an engine unused one summer = trashed my wear numbers and resulted in a call from the oil analysis = folks. Now, when I'm away I have someone run up the engine every two = weeks, leave clean oil for extended periods away and have never had a = flagged analysis since. My experience with the multigrades is less = positive than straight weight oil, particularly if multigrade is left in = for more than 25 hours. At 25 hours between changes, I found them to be = similar except the A/S W100 (or W80 in winter) is far cheaper. Paul IO550 Legacy 720 TT On 2013-07-03, at 11:49 AM, "William A. Hogarty" = wrote: > Hi Colyn: > =20 > Not much use for an engine drier when the engine hasn't run since last = August. > =20 > BUMMER