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).

  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.