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 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 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 . 4A30 Displacement — Bore x Stroke — 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 — at 7500 rpm Torque — at 5500 rpm 659 cc SOHC (1993) Engine type — Inline 4-cylinder SOHC 16v Fuel system — ECI multiple Compression ratio — 10.0:1 Power — at 7000 rpm Torque — 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 — at 7000 rpm Torque — at 3500 rpm 4A31 Displacement — Bore x Stroke — 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 — at 6000 rpm Torque — 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 — at 6000 rpm Torque — at 4000 rpm See also List of Mitsubishi engines References 4A3 Straight-four engines Gasoline engines by model