January 2014

Experimenter is a magazine created by EAA for people who build airplanes. We will report on amateur-built aircraft as well as ultralights and other light aircraft.

Issue link: http://experimenter.epubxp.com/i/247918

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Page 35 of 38

UNDER THE COWL • • • • • • • jets for the original carburetors additional oil pump for the turbo oil lines aluminum air-box carburetor sleeves turbocharger – air-box sleeve ties This "altitude corrected" fuel-presure regulator is very sensible component that a specialised manufacturer developed and calibrated for this turbo-kit. The total additional weight of the turbo kit is 22 pounds. According to the manufacturer's dyno measurements, the engine showed an average of 121 hp with a fuel consumption at full continuous power of 5.54 gallons/hour (21 liters/hour). The installation on the manufacturer's demonstrator aircraft looked clean and professional. In talking with Alberto Marchini, a lot of useful and hidden details came out. For example, the fuel delivery system was developed with the help of a race specialist and is performing well because its pressure regulator is constantly adjusting to the aircraft's density altitude. There are two electric fuel pumps on board, with one always on. The starting procedure is similar to any other 80-hp Rotax engine. There are two fuel-pump switches, one for each fuel pump. Interestingly, the turbo-converted engine retains the original (membrane) fuel pump despite two Pierburg electric fuel pumps on board. According to Marchini, this original engine-driven fuel pump allows the aircraft to fly with reduced power, even in case of failure of both electric pumps. An additional oil pump that solely serves the turbocharger is located on top of the original 912 oil pump. To prevent the turbocharger from being flooded by the oil after the engine shutdown, a dedicated valve closes the oil flow as soon as the oil pressure drops after engine stop. The view from below to the turbo assembly; note the silencer that is directly bolted to the "hot" side of the turbo charger. 36 Vol.3 No.1 / January 2014 Photography courtesy of Marino Boric

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