The Continental IO-346 engine is a fuel-injected four-cylinder aircraft engine, first run in 1962, that was developed especially for the Beechcraft Musketeer Custom III by Continental Motors. It was produced for that aircraft between 1965 and 1969.
There is no carbureted version of the engine therefore the base model is the IO-346.
The IO-346 was designed to run on 91-98 avgas. The engine has a dry weight of 269¾ lb or 297 lb including the generator and starter. The ignition system consists of dual magnetos, one Scintilla S4RN-201 and one S4RN-205 or, alternatively, two Slick Electro 449 magnetos.
Base model, certified 27 July 1962
Identical to IO-346-A except it incorporates provisions for a hydraulic propeller control. Certified 23 June 1964.
Gadfly E.S 102
Type: 4-cylinder air-cooled horizontally opposed aircraft piston engine
Bore: 5.25 in (133 mm)
Stroke: 4.00 in (102 mm)
Displacement: 346 in³ (5.68 L)
Length: 30 in (762 mm)
Width: 33.38 in (848 mm)
Height: 22.4 in (569 mm)
Dry weight: 297 lb dry, with starter and generator (135 kg)
Valvetrain: One intake and one exhaust valve per cylinder
Fuel system: CMC fuel injection
Fuel type: 91/98 octane avgas
Cooling system: Air-cooled
Power output: 165 hp (121 kW) at 2,700 rpm
Specific power: 0.47 hp/in³ (21.2 kW/L)
Compression ratio: 7.5:1
Power-to-weight ratio: 0.56 hp/lb (0.90 kW/kg)