X-Virus-Scanned: clean according to Sophos on Logan.com X-SpamCatcher-Score: 30 [X] Return-Path: Received: from fed1rmmtao106.cox.net ([68.230.241.40] verified) by logan.com (CommuniGate Pro SMTP 5.1.9) with ESMTP id 2061940 for flyrotary@lancaironline.net; Tue, 22 May 2007 17:36:11 -0400 Received-SPF: none receiver=logan.com; client-ip=68.230.241.40; envelope-from=alventures@cox.net Received: from fed1rmimpo02.cox.net ([70.169.32.72]) by fed1rmmtao106.cox.net (InterMail vM.7.05.02.00 201-2174-114-20060621) with ESMTP id <20070522213534.PGC6556.fed1rmmtao106.cox.net@fed1rmimpo02.cox.net> for ; Tue, 22 May 2007 17:35:34 -0400 Received: from BigAl ([72.192.132.90]) by fed1rmimpo02.cox.net with bizsmtp id 2MbZ1X00J1xAn3c0000000; Tue, 22 May 2007 17:35:33 -0400 From: "Al Gietzen" To: "Rotary motors in aircraft" Subject: 2-cycle oil mix Date: Tue, 22 May 2007 14:36:04 -0800 Message-ID: <000001c79cc1$952639c0$6400a8c0@BigAl> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0001_01C79C7E.870543B0" X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook, Build 10.0.6626 Importance: Normal X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.3028 This is a multi-part message in MIME format. ------=_NextPart_000_0001_01C79C7E.870543B0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit I guess I'm finding another reason for burning 2-cycle oil rather than sump oil injection. On my Velocity the exhaust goes out through the prop. It discolors the prop - not because of temp (I've measured that), and not because of carbon deposits - but because of brownish, sort of gummy stuff that I'm concluding is partially burned oil. Extended Running at low power on the ground, or after a long decsent, there is enough on there, and fluid enough, to actually streak outward a bit from centrifugal force. It would help, of course, if the OMP setting was coupled to the throttle as in a car, so it would shut off when the throttle is nearly closed; but that is a complication I didn't include on the plane. I'm running Castrol 20-50, which is a great lubricating oil, but apparently it doesn't burn real well. Al ------=_NextPart_000_0001_01C79C7E.870543B0 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

I guess I’m finding another reason for = burning 2-cycle oil rather than sump oil injection.  On my = Velocity the exhaust goes out through the prop.  It discolors the prop – = not because of temp (I’ve measured that), and not because of carbon deposits = – but because of brownish, sort of gummy stuff that I’m concluding = is partially burned oil.  Extended Running at low power on the ground, or after = a long decsent, there is enough on there, and fluid enough, to actually streak outward a = bit from centrifugal force.

 

It would help, of course, if the OMP setting was = coupled to the throttle as in a car, so it would shut off when the throttle is = nearly closed; but that is a complication I didn’t include on the = plane.

 

I’m running Castrol 20-50, which is a great lubricating oil, but apparently it doesn’t burn real = well.

 

Al

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