X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from elasmtp-spurfowl.atl.sa.earthlink.net ([209.86.89.66] verified) by logan.com (CommuniGate Pro SMTP 6.0.8) with ESMTP id 6689637 for lml@lancaironline.net; Thu, 16 Jan 2014 11:48:10 -0500 Received-SPF: none receiver=logan.com; client-ip=209.86.89.66; envelope-from=colyncase@earthlink.net DomainKey-Signature: a=rsa-sha1; q=dns; c=nofws; s=dk20050327; d=earthlink.net; b=cQnCci17Bup+PWeQvl3UHQNTk9V8Fd1hqPV5LRMbGFgLkwUCXwvbT5zrQbRbPIyS; 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 [64.223.93.133] (helo=[192.168.1.24]) by elasmtp-spurfowl.atl.sa.earthlink.net with esmtpa (Exim 4.67) (envelope-from ) id 1W3q6R-0002WS-WA for lml@lancaironline.net; Thu, 16 Jan 2014 11:47:36 -0500 From: Colyn Case Mime-Version: 1.0 (Apple Message framework v1085) Content-Type: multipart/alternative; boundary=Apple-Mail-40--733204765 Subject: Re: [LML] Secondary oil filter Date: Thu, 16 Jan 2014 11:47:35 -0500 In-Reply-To: To: "Lancair Mailing List" References: Message-Id: <51DDEE93-3005-4437-8EF9-6419408BC08A@earthlink.net> X-Mailer: Apple Mail (2.1085) X-ELNK-Trace: 63d5d3452847f8b1d6dd28457998182d7e972de0d01da940c4b6b193f12c4ac6f8b17f1ccfbac711350badd9bab72f9c350badd9bab72f9c350badd9bab72f9c X-Originating-IP: 64.223.93.133 --Apple-Mail-40--733204765 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=us-ascii Paul, yes, the secondary filters for autos definitely caught my eye when I was = looking at the problem a few years ago. ...but it seems like an area where if you screw it up it's very bad = news. the secondary idea SEEMS less risky than a high efficiency element but = it requires yet two more lines (I already have 4 for the turbos and 2 = for the remote mounted filter) and could conceivably have some odd side = effects. =20 I wonder what kind of a test protocol you would have to set up to feel = reasonably confident you had a good installation? all in all I'm inclined to change my oil at short intervals and hope = someone else will figure this out some day. Nevertheless, after doing = the Continental factory tour I'm very inclined to believe that clean oil = would be a good thing. Colyn On Jan 16, 2014, at 9:12 AM, Paul Miller wrote: 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-40--733204765 Content-Transfer-Encoding: quoted-printable Content-Type: text/html; 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
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. =  


= = --Apple-Mail-40--733204765--