4G5

4G5 is a designation that can refer to several different things, most notably a family of Mitsubishi internal combustion engines and a specific model of an airplane.

In the automotive world, the 4G5 engine series, also known as the Astron, is a four-cylinder internal combustion engine developed by Mitsubishi Motors. First introduced in the 1970s, these engines were produced in various displacements, including 1.8, 2.0, and 2.6 liters. They featured a SOHC (Single Overhead Camshaft) or DOHC (Double Overhead Camshaft) valvetrain. The 4G5 engine found its way into a wide range of Mitsubishi vehicles and also powered models from other manufacturers through OEM agreements, such as some Chrysler and Dodge vehicles sold in North America. Notable features included the use of balance shafts in some variants to reduce vibration and improve smoothness. The engine family was eventually succeeded by other Mitsubishi engine designs.

Separately, the designation "4G5" can also refer to the Aero Commander 4G5, a twin-engine, propeller-driven aircraft. This model was part of the Aero Commander line, known for its utility and ruggedness. The 4G5 variant was typically configured as a light transport or executive aircraft. It featured a high-wing monoplane design and was powered by two piston engines. Production and development of this specific model would have occurred within the broader history of Aero Commander aircraft, which has seen ownership changes over its existence, including periods under Rockwell International and later under other entities.