lml@lancaironline.net Mailing List Archive

<<<<<<<<<<<<<<<<--->>>>>>>>>>>>>>>> << Lancair Builders' Mail List >> <<<<<<<<<<<<<<<<--->>>>>>>>>>>>>>>> >> >> What happened to the "lean burn" engine TCM seemed so proud of a few years ago? When I talked to the TCM rep at SnF this year, he acted like he'd never heard of it, and grumped that TCM didn't recommend LOP operations, period. <<< Not only DOES TCM RECOMMEND LOP operations, they mandate lean of peak operations for the TSIO-520BE engines in the Malibu. In fact, the biggest problems with those engines resulted only from the failure of TCM to accomplish an adequate pilot education program and make sure the pilots did not "add some fuel for cooling" and end up operating rich of peak (and therefore, very hot) rather than operating lean of peak and relatively cool. Malibu owners who religiously operated the engines at 50 to 60 or more LOP have had good results. The IO-550G manual for the Mooneys specifically includes power charts for LOP operations. The Beech manual for the A36 / IO-550 specifically recommends operating the engine either lean of peak or rich of peak, but not AT peak. I am unfamiliar with any TCM engine that was ever designated as a "lean burn" engine. However, the TSIO-520Be engine is designed to only be operated at lean of peak settings at high power cruise. Perhaps that is the engine you were referring to. It is still a widely used engine in the Malibu fleet. Regards, George >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> LML website: http://www.olsusa.com/Users/Mkaye/maillist.html LML Builders' Bookstore: http://www.buildersbooks.com/lancair Please send your photos and drawings to marvkaye@olsusa.com. >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>