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| Mitsubishi Orion engine | |
|---|---|
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| Overview | |
| Manufacturer | Mitsubishi Motors |
| Also called | 4G1 |
| Production | 1977–present |
| Layout | |
| Configuration | Straight-4 |
| Displacement | 1.2–1.6 L (1,244–1,584 cc) |
| Cylinder bore | 68.2 mm (2.69 in) 69.5 mm (2.74 in) 71 mm (2.8 in) 72.2 mm (2.84 in) 74 mm (2.91 in) 75.5 mm (2.97 in) 76 mm (2.99 in) |
| Piston stroke | 82 mm (3.23 in) 87.3 mm (3.44 in) |
| Cylinder block material | Cast iron |
| Valvetrain | OHV 2 valves x cyl. SOHC 2 or 3 valves x cyl. DOHC 4 valves x cyl. with MIVEC or without |
| Compression ratio | 9.4:1 |
| Combustion | |
| Turbocharger | TC06 (on 4G12T only) |
| Fuel system | Carburetor Multi-port fuel injection Direct injection |
| Fuel type | Gasoline |
| Cooling system | Water-cooled |
| Output | |
| Power output | 73–197 hp (54–147 kW) |
| Torque output | 10.9–15.3 kg⋅m (107–150 N⋅m; 79–111 lb⋅ft) |
| Chronology | |
| Predecessor | Neptune engine |
The Mitsubishi Orion or 4G1 engine is a series of inline-four internal combustion engines introduced by Mitsubishi Motors in around 1977, along with the Astron, Sirius, and Saturn. It was first introduced in the Colt and Colt-derived models in 1978. Displacement ranges from 1.2 to 1.6 L (1,244 to 1,584 cc).