X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from smtp101.sbc.mail.mud.yahoo.com ([68.142.198.200] verified) by logan.com (CommuniGate Pro SMTP 5.3c3) with SMTP id 4004998 for flyrotary@lancaironline.net; Sun, 06 Dec 2009 14:03:10 -0500 Received-SPF: none receiver=logan.com; client-ip=68.142.198.200; envelope-from=ceengland@bellsouth.net Received: (qmail 8725 invoked from network); 6 Dec 2009 19:02:35 -0000 Received: from adsl-144-194-67.jan.bellsouth.net (ceengland@70.144.194.67 with plain) by smtp101.sbc.mail.mud.yahoo.com with SMTP; 06 Dec 2009 11:02:35 -0800 PST X-Yahoo-SMTP: uXJ_6LOswBCr8InijhYErvjWlJuRkoKPGNeiuu7PA.5wcGoy X-YMail-OSG: FdjWjLIVM1lzqKbMiXKCBNvp9WZG9920iQ46trCfbEfS4S4pF1rIbi6FrsOfP6vwcB1nGU_Quaso65TA0ri0uYHDQgfrAC9CcHNnuosTwxVKF7LtD1GlBbWRbjYhsojP5gmmyZ_eo.AEo8y8cOZJ.rPnlr0FYEuiwr41mfLpBcecv8UYdAuVib2O7Xd9h.M9eqJG2.hrKjU0OP1a7kNydV.VGCy2zX0sSS4gbJ0pfIE4gSC6iYpbzw5bPPcs6clN2sPcJhzUBUqLWl0ODtfShafyOXuTNiBo_Z_A6RqdlUL_rOa5CTNR_i7O1FNPJ53UwkcqlI2ZNhc3hTgo5cyx9R93fxApe.edWDUX5hXDdK3N7va_weBF0qIHSao2OowU5xYuvA-- X-Yahoo-Newman-Property: ymail-3 Message-ID: <4B1BFFCC.5080905@bellsouth.net> Date: Sun, 06 Dec 2009 13:02:36 -0600 From: Charlie England User-Agent: Thunderbird 2.0.0.23 (Windows/20090812) MIME-Version: 1.0 To: Rotary motors in aircraft Subject: Re: [FlyRotary] Oil starvation References: In-Reply-To: Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Lynn Hanover wrote: > This is a similar question about smoothing an iron I did for the > "Nopistons" list. This is for irons that have been run so long they > have developed a chrome like finish. New seals will take a year to > seat in on a chrome finish. Same as honing a cylinder in a piston > engine. I prefer the better oil holding of a deeper finish to that of > a stock Mazda. But almost anything will work. > > Also Yawpower has the web site back up, and I urge you to read all of > his tech articles about rotaries. > > http://www.yawpower.com/CompanyInfo.html > > You can lap the surface yourself and you can get it ready with a > random orbital sander. Used dry with 180 grit paper, > this alone will get most of the surface close to one color. You can > run the front iron against the front side of the center iron with oil > and valve grinding compound in between. Wipe it off now and then to be > sure all of the surface > has a flat finish with no shiny spots. This will produce a very > satisfactory result on both irons. About half way through, rotate the > top iron 180 degrees so the ports are not together the whole time. If > you have a mill or access to one make a bar and plate with holes in > the plate to mount a bearing on a bolt. Plant the bearing in the > center hole, so it impinges the iron about one inch. Run the mill > slowly and keep adding grinding paste as you go along. > A few layers of Visqueen under the bottom plate will keep the mill > clean and allow reuse of the paste. Bolt on a rod of some kind and run > the rod through a fixed bracket or just any bracket on the bed to keep > the iron from spinning. Then you flip the center iron over and do the > same again with the rear iron. If you drill press has an electronic > speed control that allows for very slow rotation, you can use it as well. > > This method costs nearly nothing and produces very flat irons with a > nice oil holding finish. Clean the irons at the car wash with high > pressure water and soap. Spray with WD-40. > > You can do this by hand as well, but it will take all day long. This > can be done quite a few times without bothering the nitride. Piece of > cake. This has to do with finish, and is not much help with wear > grooves since it removes very little material. > > Lynn E. Hanover For cleaning, an amazingly effective tool is a kitchen dish washer. If you can't talk your spouse into using hers (it won't hurt it, honest :-) ), then pick one up from your local Goodwill/Thrift Store for $10. I first read about using this in relation to cleaning a/c cylinders. Dish detergent is a very potent grease remover. I've been using ours to clean aluminum parts prior to painting & it works great. Charlie