Mitsubishi 3G8 engine


The Mitsubishi 3G8 engine is a range of three-cylinder powerplant from Mitsubishi Motors, introduced in the fifth generation of their Mitsubishi Minica kei car. In common with other contemporary engines in the class, it could be specified with many advanced technologies despite its diminutive size, including multi-valve cylinder heads and double overhead camshafts. The top-of-the-line Dangan ZZ variant was also the first kei car to benefit from turbocharging. In 1987 Mitsubishi was the first manufacturer to supercharge a kei vehicle, and in 1989 became the world's first production car to feature five valves per cylinder, ahead of similar developments by Bugatti, Audi, Ferrari and Toyota.
Its 3G81 three-cylinder engine has a displacement of and features three intake valves and two exhaust valves incorporated into each cylinder. The valves are controlled by twin overhead camshafts through roller cam followers on finger rockers with hydraulic automatic lash adjusters. Gasoline is electronically injected through triple-jet nozzles. The water-cooled turbocharger operates through an air-to-air intercooler. The ignition timing advance is also controlled electronically, and a knock-sensing system is included.
Originally a engine, it was enlarged to in 1990 following changes in the class regulations. The four-cylinder 4A3 engine is derived from the 3G8, sharing its bore pitch.

3G81

Displacement —
Bore —
Stroke —
Fuel type — Unleaded regular gasoline

Single carb (1987)

Displacement —
Bore —
Stroke —
Engine type — Inline three-cylinder SOHC 6 valves
Power — at unknown rpm
This was built only for the Taiwanese market Mitsubishi Towny and Minicab 800, from 01.87 - 11.88. Most specifications are unknown.

3G83

Displacement —
Bore —
Stroke —
Fuel type — Unleaded regular gasoline

Double carb (1990)

Displacement —
Bore —
Stroke —
Engine type — Inline four-cylinder SOHC
Power — JIS at 5,500 rpm
Torque — at 3,500 rpm
Of the same dimensions as the 3G82 but with a fourth cylinder, this was built in Taiwan by CMC. Used in the Mitsubishi Varica.