| Mitsubishi 4A3 engine | |
|---|---|
 | |
| Overview | |
| Manufacturer | Mitsubishi Motors |
| Production | 1993–present |
| Layout | |
| Configuration | Inline-four |
| Displacement | 0.7–1.1 L (659–1,094 cc) |
| Cylinder bore | 60 mm (2.36 in) 66 mm (2.6 in) |
| Piston stroke | 58.3 mm (2.30 in) 80 mm (3.15 in) |
| Cylinder block material | Cast iron |
| Cylinder head material | Aluminium |
| Valvetrain | SOHC 4 valves x cyl. DOHC 5 valves x cyl. |
| Compression ratio | 8.5:1-11.0:1 |
| Combustion | |
| Turbocharger | On 1993 0.7 L (659 cc) DOHC only |
| Fuel system | Electro carburettor Electronic fuel injection Direct Injection |
| Fuel type | Gasoline |
| Cooling system | Water-cooled |
| Output | |
| Power output | 50–78 PS (37–57 kW) |
| Torque output | 56–103 N⋅m (41–76 lb⋅ft) |
The Mitsubishi 4A3 engine is a range of alloy-headed inline four-cylinder engines from Mitsubishi Motors, introduced in 1993 in the sixth generation of their Mitsubishi Minica kei car. It shares a 72 mm (2.8 in) bore pitch with the 3G8-series three-cylinder engines, but has a considerably shorter stroke so as to stay beneath the 660 cc limit imposed by the Kei class.[1]
A 1.1 L (1,094 cc) version was made available in 1997 for larger cars, and was subsequently fitted to the Mitsubishi Pistachio, (and Pajero JR), a limited production car based on the kei class Minica equipped with the company's Automatic Stop-Go (ASG) system for cutting the engine when idling. So equipped, the Pistachio was able to record fuel economy figures of 30 km/L (85 mpg‑imp; 71 mpg‑US).