Lycoming IO-390 The Lycoming IO-390 engine is a horizontally opposed , four-cylinder aircraft engine , manufactured by Lycoming Engines . There is no carburetted version of the engine, which would have been designated O-390 and therefore the base model is the IO-390.The engine was originally conceived in the 1970s as the IO-400-X, but the project was never pursued. The IO-390 family of engines, which Lycoming refers to as the IO-390-X, produce to. The IO-390 was developed from the similar IO-360 engine, by using cylinders from the IO-580 to increase the O-360's cylinder bore . It features a tuned induction system, roller tappets and Slick Start ignition. The engine has a fuel injection system which meters fuel in proportion to the induction airflow with fuel vaporization taking place at the intake ports. The engine has a displacement of. The cylinders have air-cooled heads . The IO-390 was first introduced at AirVenture 2002. It has a factory recommended TBO of 2000 hours and requires a dynafocal engine mount . The IO-390 was initially marketed through Lycoming's custom engine subsidiary, Thunderbolt Engines, prior to the engine's certification and was at that time only available for installation on non-certified aircraft. The IO-390 was certified on 30 March 2009 to FAR 33 effective February 1 , 1965, as amended by 33-1 through 33-24. In January 2009 the base price of the IO-390-EXP version was USD$32,650.00. In November 2009 Lycoming announced that it had obtained an FAA Supplemental Type Certificate to replace the originally fitted Lycoming O-360 engines in the Mooney M20E, M20F and M20J with a new or remanufactured IO-390-A3A6 engine. Also on November 12 , 2009 Commander Aircraft received an STC for its model 112B using the MTV-12-B/188-59b propeller.Variants IO-390 models ;IO-390-X ;IO-390-EXP ;IO-390-A1A6 ;IO-390-A1B6 ;IO-390-A3A6 ;IO-390-A3B6 ;IO-390-C1A6 ;IO-390-C1B6 ;IO-390-C3A6 ;IO-390-C3B6AEIO-390 models ;AEIO-390-A1A6 ;AEIO-390-A1B6 ;AEIO-390-A3A6 ;AEIO-390-A3B6Applications ;Amateur-built aircraftBearhawk Companion Glasair Sportsman Ibis GS-750 Grand Magic Lancair Barracuda Lancair ES MSW Votec 221 Pipistrel Panthera Van's Aircraft RV-7 Van's Aircraft RV-8 Van's Aircraft RV-14 Whisper X350 Generation II ;Certified aircraftCessna 177RG - available in July 2009 under an STC Cirrus SR20 - factory installed IO-390-C3B6 version on the SR20 G6 version Mooney M20 E, F & J - available in November 2009 under an STC Piper PA-28R Arrow - proposed under STC Symphony SA-160 - proposed as a factory installed version, but aircraft no longer in production Tecnam P2010 ;Military Aircraft
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