Return-Path: Received: from ns5.rokland.us ([67.15.10.31] verified) by logan.com (CommuniGate Pro SMTP 4.2.5) with ESMTP-TLS id 540759 for flyrotary@lancaironline.net; Sun, 21 Nov 2004 10:35:08 -0500 Received-SPF: none receiver=logan.com; client-ip=67.15.10.31; envelope-from=bob@bob-white.com Received: from bgp01386375bgs.brodwy01.nm.comcast.net ([68.35.160.229] helo=localhost) by ns5.rokland.us with smtp (Exim 4.43) id 1CVtjZ-0008TF-Ly for flyrotary@lancaironline.net; Sun, 21 Nov 2004 09:34:37 -0600 Date: Sun, 21 Nov 2004 08:34:35 -0700 From: Bob White To: "Rotary motors in aircraft" Subject: Re: [FlyRotary] Re: MMO vs 2-cycle (was Re: how do you carry, and measure oil?) Message-Id: <20041121083435.64a01ed5.bob@bob-white.com> In-Reply-To: References: X-Mailer: Sylpheed version 1.0.0beta2 (GTK+ 1.2.10; i686-pc-linux-gnu) Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit X-Antivirus-Scanner: Clean mail though you should still use an Antivirus X-AntiAbuse: This header was added to track abuse, please include it with any abuse report X-AntiAbuse: Primary Hostname - ns5.rokland.us X-AntiAbuse: Original Domain - lancaironline.net X-AntiAbuse: Originator/Caller UID/GID - [47 12] / [47 12] X-AntiAbuse: Sender Address Domain - bob-white.com X-Source: X-Source-Args: X-Source-Dir: OK, I give up. I thought after a few comments I could figure it out, but what is MMO exactly? Bob White On Sun, 21 Nov 2004 08:39:27 -0600 "Russell Duffy" <13brv3@bellsouth.net> wrote: > I have used the MMO/2 cycle mix in the past but for the last 100 > hours I > have been using the Wal-Mart Marine 2 cycle oil. After reading up on > the different classifications of 2 cycle oil (most brands are all in > one now) and looking at the temperature profiles for the apex seals I > concluded that almost anything would do a better job than crankcase > oil of lubricating the seals. And 2 cycle certainly leaves less > residue than crankcase oil. > > Mornin' Ed, > > Is MMO and 2-cycle oil close to the same thing? When I try to > rationalize using one over the other, I come up with one other issue. > Our pre-mix oil does get scavenged into the crankcase to some extent. > MMO is made to be used in fuel, and oil, so that's not a problem. I > can't say that I've ever heard anyone comment on the effect that > 2-cycle oil has in our crankcase. I've wondered if this alone is a > reason to prefer MMO over 2-cycle oil. > > Another question just came to me. Does oil injection cause oil to be > scavenged into the crankcase? I'm assuming it would be less than what > we get with pre-mix, though some must make the trek. I wonder if > Mazda considered that when deciding to use crankcase oil for the apex > seals? Of course originally, they weren't using the dripper > injectors, but rather injecting the oil into the fuel/air stream at > the carb. > > Cheers, > Rusty > > > > -- http://www.bob-white.com N93BD - Rotary Powered BD-4 (soon)