X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Thu, 16 Jan 2014 09:12:11 -0500 Message-ID: X-Original-Return-Path: Received: from mail-qe0-f41.google.com ([209.85.128.41] verified) by logan.com (CommuniGate Pro SMTP 6.0.8) with ESMTPS id 6688867 for lml@lancaironline.net; Wed, 15 Jan 2014 20:13:04 -0500 Received-SPF: pass receiver=logan.com; client-ip=209.85.128.41; envelope-from=pjdmiller@gmail.com Received: by mail-qe0-f41.google.com with SMTP id i11so1945826qej.28 for ; Wed, 15 Jan 2014 17:12:28 -0800 (PST) X-Received: by 10.140.23.6 with SMTP id 6mr3133033qgo.17.1389834748591; Wed, 15 Jan 2014 17:12:28 -0800 (PST) X-Original-Return-Path: Received: from [192.168.1.100] ([67.8.24.109]) by mx.google.com with ESMTPSA id u4sm8441207qai.21.2014.01.15.17.12.26 for (version=TLSv1 cipher=ECDHE-RSA-RC4-SHA bits=128/128); Wed, 15 Jan 2014 17:12:27 -0800 (PST) From: Paul Miller Content-Type: multipart/alternative; boundary="Apple-Mail=_8182F39F-88D0-4BF9-B37F-067CD82A1E7E" X-Original-Message-Id: <62D78687-1109-4E14-A89B-0B40AB442359@gmail.com> Mime-Version: 1.0 (Mac OS X Mail 6.6 \(1510\)) Subject: Secondary oil filter X-Original-Date: Wed, 15 Jan 2014 20:12:25 -0500 References: X-Original-To: "Lancair Mailing List" In-Reply-To: X-Mailer: Apple Mail (2.1510) --Apple-Mail=_8182F39F-88D0-4BF9-B37F-067CD82A1E7E Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=us-ascii Colyn, I did a small amount of research on this issue and believe that a = secondary filter may be worth experimenting with. The concept is to = leave the stock oil filter alone. Testing the stock filters and the = micron filtration on each of the typical brands is found on the web. = Tempest says this about filters: The average porosity of aviation oil filter media is about 40 microns. = There are smaller and larger pores in the media but, on average, the media will catch most of the 40 micron or larger particles. = The smaller the particles in the oil, the fewer will be caught by a given media. For example, a 40 micron media may only stop = 80% of 30 micron particles, 40% of 20 micron particles, and 10% of 5 micron particles. Steel particles in the oil are = often five microns or less, so most will pass through the filter media and circulate, hour after hour, through the engine with = the oil. Some of the race guys and I think all the big diesels use a secondary = oil filter for ultra fine particle capture. Perhaps others already know = much more about this subject but it appears that installing a = small-micron oil filter as a secondary unit fed by a secondary supply = source could capture junk that our primary filters are not designed to = capture. This leaves the primary circuit intact including bypass, = over-pressure relief and so on. One article spoke about using the = existing oil pressure transmission line as the source of oil to a = secondary filter and directing the output to the oil pan, rocker cover = or possibly the oil filler tube. Even at the smaller line size for = this smaller filter, the oil would be passed through at least once a few = times each hour, says the calculation. Searching reveals a number of = fine micron filters (cleanable and replaceable) that are available in = stainless and anodized high pressure cannisters that would easily fit on = a firewall and apparently can capture debris in the 2-10 micron range. = Prices are all over the map. It sounds like it could be done for a reasonable price plus hoses and = connection fittings if someone thought it was worth testing. Paul IO550 On 2014-01-15, at 9:06 AM, Colyn Case wrote: I could get excited about better air filter efficiency if I could buy an = efficient oil filter for my aircraft engine. =20 --Apple-Mail=_8182F39F-88D0-4BF9-B37F-067CD82A1E7E Content-Transfer-Encoding: quoted-printable Content-Type: text/html; charset=us-ascii The average = porosity of aviation oil filter media is about 40 microns. There are = smaller and larger pores in the media but, on
average, the media will = catch most of the 40 micron or larger particles. The smaller the = particles in the oil, the fewer will be
caught by a given media. For = example, a 40 micron media may only stop 80% of 30 micron particles, 40% = of 20 micron
particles, and 10% of 5 micron particles. Steel = particles in the oil are often five microns or less, so most will pass = through
the filter media and circulate, hour after hour, through the = engine with the oil.


Some of the race guys and I = think all the big diesels use a secondary oil filter for ultra fine = particle capture.  Perhaps others already know much more about this = subject but it appears that installing a small-micron oil filter as a = secondary unit fed by a secondary supply source could capture junk that = our primary filters are not designed to capture.  This leaves the = primary circuit intact including bypass, over-pressure relief and so on. =   One article spoke about using the existing oil pressure = transmission line as the source of oil to a secondary filter and = directing the output to the oil pan, rocker cover or possibly the oil = filler tube.    Even at the smaller line size for this smaller = filter, the oil would be passed through at least once a few times each = hour, says the calculation.    Searching reveals a number of = fine micron filters (cleanable and replaceable) that are available in = stainless and anodized high pressure cannisters that would easily fit on = a firewall and apparently can capture debris in the 2-10 micron range. =  Prices are all over the map.

It sounds = like it could be done for a reasonable price plus hoses and connection = fittings if someone thought it was worth = testing.

Paul
IO550

On 2014-01-15, at 9:06 AM, Colyn Case <colyncase@earthlink.net> = wrote:

I could get excited about = better air filter efficiency if I could buy an efficient oil filter for = my aircraft engine. =  

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