Mitsubishi 4A3 engine

Mitsubishi 4A3 engine
Overview
ManufacturerMitsubishi Motors
Production1993–present
Layout
ConfigurationInline-four
Displacement0.7–1.1 L (659–1,094 cc)
Cylinder bore60 mm (2.36 in)
66 mm (2.6 in)
Piston stroke58.3 mm (2.30 in)
80 mm (3.15 in)
Cylinder block materialCast iron
Cylinder head materialAluminium
ValvetrainSOHC 4 valves x cyl.
DOHC 5 valves x cyl.
Compression ratio8.5:1-11.0:1
Combustion
TurbochargerOn 1993 0.7 L (659 cc) DOHC only
Fuel systemElectro carburettor
Electronic fuel injection
Direct Injection
Fuel typeGasoline
Cooling systemWater-cooled
Output
Power output50–78 PS (37–57 kW)
Torque output56–103 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).

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

  1. ^ "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.