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ECi O-320

Family of four-cylinder, direct-drive engines

The ECi O-320 is part of a family of normally aspirated, air-cooled, four-cylinder, direct-drive engines developed for certified 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.

From Wikipedia (CC BY-SA). Not a dictionary word, so it lives in Other Names.