The ECi O-320 is part of a family of normally aspirated, air-cooled, four-cylinder, direct-drive engines developed for ceritified and experimental aircraft. Its cylinders are arranged in horizontally opposed configuration and a displacement of 320 cubic inches (5.24 L). It is based on the Lycoming O-320 engine with ECi cylinder assemblies.
Design and development
ECi developed engine kits starting in 1995.
ECi O-320
154 hp (115 kW) at 2700 rpm, Minimum fuel grade 100/100LL avgas, compression ratio 7.0:1. Certified Applications
ECi OX-320
154 hp (115 kW) at 2700 rpm, Minimum fuel grade 100/100LL avgas, compression ratio 7.0:1. Experimental Variant
ECi IOX-320
156 hp (116 kW) at 2700 rpm, Minimum fuel grade 100/100LL avgas, compression ratio 7.0:1. Feul Injected Experimental
Data from ECi
Type: Four-cylinder air-cooled horizontally opposed engine
Bore: 5.125 in (130.18 mm)
Stroke: 3.875 in (98.43 mm)
Displacement: 319.7 cu in (5.24 l)
Length: 29.07
Width: 32.27
Height: 24.8
Dry weight: 244 lb (111 kg)
Valvetrain: Two overhead valves per cylinder
Fuel system: MA4-5 Carb
Fuel type: minimum grade of 100/100LLavgas
Oil system: Wet sump
Cooling system: Air-cooled
Power output: 154 hp (115 kW)
Compression ratio: 7:1
