X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from aspensprings.uwyo.edu ([129.72.10.32] verified) by logan.com (CommuniGate Pro SMTP 6.0c1) with ESMTPS id 5741066 for flyrotary@lancaironline.net; Sun, 02 Sep 2012 13:43:05 -0400 Received-SPF: none receiver=logan.com; client-ip=129.72.10.32; envelope-from=SBoese@uwyo.edu Received: from ponyexpress-ht4.uwyo.edu (extlb.uwyo.edu [172.26.4.4]) by aspensprings.uwyo.edu (8.14.4/8.14.4) with ESMTP id q82HgPg3008786 (version=TLSv1/SSLv3 cipher=AES128-SHA bits=128 verify=FAIL) for ; Sun, 2 Sep 2012 11:42:28 -0600 (MDT) (envelope-from SBoese@uwyo.edu) Received: from ponyexpress-m10.uwyo.edu ([fe80::60dd:cb9e:6f71:3d48]) by ponyexpress-ht4.uwyo.edu ([fe80::8de7:b225:a85b:d0ee%13]) with mapi id 14.01.0339.001; Sun, 2 Sep 2012 11:42:27 -0600 From: "Steven W. Boese" To: Rotary motors in aircraft Subject: RE: [FlyRotary] OMP lines Thread-Topic: [FlyRotary] OMP lines Thread-Index: AQHNiSjp7X7p+8ANi0yR0zbIHY+TSZd3SEpV Date: Sun, 2 Sep 2012 17:42:27 +0000 Message-ID: <3E8191F276108F4481AB0721BBA9269E05C830FD@ponyexpress-m10.uwyo.edu> References: In-Reply-To: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [75.220.131.241] Content-Type: multipart/alternative; boundary="_000_3E8191F276108F4481AB0721BBA9269E05C830FDponyexpressm10u_" MIME-Version: 1.0 --_000_3E8191F276108F4481AB0721BBA9269E05C830FDponyexpressm10u_ Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Mark, I replaced the plastic OMP lines with ones made from steel brake line silve= r brazed to the banjo fittings. SS tubing was not used because of its tend= ency to harden and crack when worked or vibrated. The lines were embedded = in a blob of silicone about halfway between the OMP and the nozzles to damp= en vibrations. These lines never leaked or failed in the 300 hours that th= ey were installed. If you happen to be using 2009 or later oil metering no= zzles, be aware that the check valve in them requires from 45 to 50 psi to = open which may be incompatible with older OMP's. Those lines outlasted the engine. After 300 hours, the engine lost compres= sion and a teardown revealed chatter marks almost all the way around the ho= usings, the chrome completely missing all the way across the housing in som= e locations which were very rough, matching rough wear surface of the apex = seals, and partially collapsed apex seal springs. Records kept throughout = the life of the engine indicate the the OMP had delivered between 0.9 and 1= Oz of oil per gallon of fuel used the entire time. Metered oil was a 50-5= 0 mix of MMO and 2 cycle oil. Almost all of the time on the engine was at = 23" of MAP or less due to the 7200 ft elevation here. RPM was usually in th= e range of 5200 - 5500. Fuel used was mostly 87 octane non-alcohol auto f= uel with 100LL used on some of the cross country trips taken. Static timin= g was set as recommended in the EC2 manual and left at the default programm= ing value. Maybe I just couldn't work the engine hard enough here? Steve Boese RV6A, 1986 13B NA, RD1A, EC2 ________________________________ From: Rotary motors in aircraft [flyrotary@lancaironline.net] on behalf of = Mark Steitle [msteitle@gmail.com] Sent: Sunday, September 02, 2012 10:34 AM To: Rotary motors in aircraft Subject: [FlyRotary] OMP lines OK guys, Now that I have my OMP installed and working, the lines have begun leaking = at the banjo fittings. Any suggestions on replacements or upgrades. Mazda= trix has the front and rear lines but they're $40/ea. and I'm not sure they= would fit my 3-rotor. I'm thinking of making some up out of SS. While searching the internet, I found some real neat fittings with SS braid= ed line for dirt bicycles from goodridge, http://www.gravity-slaves.co.uk/?= a=3D240 The banjo bolt is 8 mm. Any ideas? Mark --_000_3E8191F276108F4481AB0721BBA9269E05C830FDponyexpressm10u_ Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable

Mark,

 

I replaced the plastic OMP lines with ones made from steel brake line si= lver brazed to the banjo fittings.  SS tubing was not used becaus= e of its tendency to harden and crack when worked or vibrated.  The li= nes were embedded in a blob of silicone about halfway between the OMP and the nozzles to dampen vibrations.  These lines ne= ver leaked or failed in the 300 hours that they were installed.  If yo= u happen to be using 2009 or later oil metering nozzles, be aware that the = check valve in them requires from 45 to 50 psi to open which may be incompatible with older OMP's.

 

Those lines outlasted the engine.  After 300 hours, the engine lost= compression and a teardown revealed chatter marks almost all the way aroun= d the housings, the chrome completely missing all the way across the housin= g in some locations which were very rough, matching rough wear surface of the apex seals, and partially collapsed ape= x seal springs.  Records kept throughout the life of the engine indica= te the the OMP had delivered between 0.9 and 1 Oz of oil per gallon of fuel= used the entire time.  Metered oil was a 50-50 mix of MMO and 2 cycle oil.  Almost all of the time on the en= gine was at 23" of MAP or less due to the 7200 ft elevation here. = ;RPM was usually in the range of 5200 - 5500.   Fuel used was mos= tly 87 octane non-alcohol auto fuel with 100LL used on some of the cross country trips taken.  Static timing was set as reco= mmended in the EC2 manual and left at the default programming value.  = Maybe I just couldn't work the engine hard enough here?

 

Steve Boese
RV6A, 1986 13B NA, RD1A, EC2

     

 

 

From: Rotary motors in aircraft [flyrotary= @lancaironline.net] on behalf of Mark Steitle [msteitle@gmail.com]
Sent: Sunday, September 02, 2012 10:34 AM
To: Rotary motors in aircraft
Subject: [FlyRotary] OMP lines

OK guys,

Now that I have my OMP installed and working, the lines have begun lea= king at the banjo fittings.  Any suggestions on replacements or upgrad= es.  Mazdatrix has the front and rear lines but they're $40/ea. and I'= m not sure they would fit my 3-rotor.  I'm thinking of making some up out of SS.  

While searching the internet, I found some real neat fittings with SS = braided line for dirt bicycles from goodridge, http://www.gravity-slaves.c= o.uk/?a=3D240

The banjo bolt is 8 mm.

Any ideas?

Mark
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