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| Mitsubishi Saturn engine | |
|---|---|
 | |
| Overview | |
| Manufacturer | Mitsubishi Motors |
| Also called | 4G3 |
| Production | 1969–1999 |
| Layout | |
| Configuration | Straight-4 & Straight-6 |
| Displacement | 1.2–2.0 L (1,239–1,994 cc) |
| Cylinder bore | 73 mm (2.87 in) 74.5 mm (2.93 in) 77 mm (3.03 in) 79 mm (3.11 in) 80.6 mm (3.17 in) |
| Piston stroke | 74 mm (2.91 in) 77 mm (3.03 in) 86 mm (3.39 in) |
| Cylinder block material | Cast iron |
| Cylinder head material | Aluminium |
| Valvetrain | SOHC & DOHC, 2 valves x cyl. |
| Compression ratio | 9.5:1 |
| Combustion | |
| Turbocharger | On G32B & 4G32T |
| Fuel system | Mikuni-built Solex carburetor Central-point EFI |
| Fuel type | Gasoline |
| Cooling system | Water-cooled |
| Output | |
| Power output | 37–115 hp (28–86 kW) |
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 1.2 to 1.8 L (1,239 to 1,755 cc), although there was also a rare 2-litre (1,994 cc) 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.