| 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.
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).
4A30
Displacement — 0.7 L (659 cc)
Bore x Stroke — 60 mm × 58.3 mm (2.36 in × 2.30 in)
Fuel type — Unleaded regular gasoline
659 cc Electronic carburettor (1993)
- Engine type — Inline 4-cylinder SOHC 16v
- Fuel system — Electro carburettor
- Compression ratio — 10.0:1
- Power — 50 PS (37 kW) at 7500 rpm
- Torque — 56 N⋅m (41 lb⋅ft) at 5500 rpm
659 cc SOHC (1993)
- Engine type — Inline 4-cylinder SOHC 16v
- Fuel system — ECI multiple
- Compression ratio — 10.0:1
- Power — 55 PS (40 kW) at 7000 rpm
- Torque — 60 N⋅m (44 lb⋅ft) at 5000 rpm
659 cc DOHC turbo (1993)
- Engine type — Inline 4-cylinder DOHC 20v
- Fuel system — ECI multiple
- Compression ratio — 8.5:1
- Power — 64 PS (47 kW) at 7000 rpm
- Torque — 97 N⋅m (72 lb⋅ft) at 3500 rpm
4A31
Displacement — 1.1 L (1,094 cc)
Bore x Stroke — 66 mm × 80 mm (2.60 in × 3.15 in)
Fuel type — Unleaded regular gasoline
1094 cc SOHC (1997)
- Engine type
- Inline 4-cylinder SOHC 16v
- Fuel system
- ECI multiple
- Compression ratio
- 9.5:1
- Power
- Pajero Junior: 80 PS (59 kW) at 6000 rpm
- Toppo BJ Wide: 78 PS (57 kW) at 6000 rpm
- Town Box Wide: 75 PS (55 kW) at 6000 rpm
- Torque
- Pajero Junior: 98 N⋅m (72 lb⋅ft) at 4000 rpm
- Toppo BJ Wide: 103 N⋅m (76 lb⋅ft) at 4000 rpm
- Town Box Wide: 100 N⋅m (74 lb⋅ft) at 4000 rpm
1094 cc GDI (1999)
- Engine type
- Inline 4-cylinder DOHC 16v
- Fuel system
- GDI Direct Injection
- Compression ratio
- 11.0:1
- Power
- 74 PS (54 kW) at 6000 rpm
- Torque
- 100 N⋅m (74 lb⋅ft) at 4000 rpm
See also
References
- "軽自動車用の4気筒エンジン" [Kei four-cylinder engines]. a-design-for-life (in Japanese). 2014-09-27. Archived from the original on 2019-07-08.
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