The Mitsubishi Saturn or 4G3 engine is series of overhead camshaft (OHC) straight-four internal combustion engines introduced by Mitsubishi Motors and saw first service in the 1969 Colt Galant. Displacement ranges from , although there was also a rare inline-six version built from 1970 until 1976. The early versions have chain driven valvetrain while the later versions are belt driven and equipped with balance shafts. 4G30 The 4G30 displaces . It is an 8-valve SOHC design with an aluminium head and iron block. The engine has five main bearings. Power was . Bore x Stroke: Applications 1969.12-1971.09 Mitsubishi Galant A I (A51) 4G31 The 4G31 displaces . It is an 8-valve SOHC design with an aluminium head and iron block. The engine has five main bearings. Power was depending on which carburetor combo was used. An updated version with central-point electronic fuel injection was installed in Mirages and Lancers from 1986 on. A version for industrial use has at 3000 rpm. Bore x Stroke: Applications 1969.12 – 1971.09 Mitsubishi Galant A II, A III (A52) 1986–1987 Mitsubishi Mirage Mitsubishi FG20 Forklift 4G32 In 1970, the 4G32 was introduced, and it displaces . It is an eight-valve SOHC design with an aluminium head and iron block. The engine has five main bearings, a cross flow head and a single down draught carburetor. Firing order is 1-3-4-2. The GSR versions used two twin-barrel Mikuni-built Solex carburetors for a total of (SAE). A version with an early iteration of Mitsubishi's MCA lean-burn system (MCA-IIB), fulfilling the intermediate Japanese exhaust regulations for 1975, was called G32A. This was built for less than one year, as the new MCA engine arrived in November 1975. Those with the later, cleaner yet, "MCA-Jet" system were called G32B. Later, the G32B also came in a fuel injected, turbocharged model. For competition, a version of the 4G32 engine was made with a DOHC eight-valve cylinder head, and fitted with two twin-choke Solex sidedraft carburettors. Bore x Stroke: Mitsubishi Celeste Mitsubishi Galant Mitsubishi L200 Mitsubishi L300 1973.02 – 1979.03 Mitsubishi Lancer (A73A) 1977.06 – 1979.03 Mitsubishi Lancer (A144A, G32B) 1975.03 – 1979.06 Mitsubishi (Lancer) Celeste (A73A) 1975.03 – 1975.11 Mitsubishi (Lancer) Celeste (A77A, G32A) 1977.07 – 1981.07 Mitsubishi (Lancer) Celeste (A144, G32B) 1980–1987 Mitsubishi Lancer EX (A174A) Mitsubishi Galant Lambda/Sapporo Mitsubishi Sigma Mitsubishi Sapporo Mitsubishi Cordia Mitsubishi Tredia Mitsubishi Mirage Dodge Colt Eagle Vista Turbo Hyundai Pony Hyundai Stellar Mazda