Mitsubishi 4G9 engine
Mitsubishi 4G94.jpg
ManufacturerMitsubishi Motors
Displacement1.5 L (1,496 cc)
1.6 L (1,597 cc)
1.8 L (1,834 cc)
2.0 L (1,999 cc)
Cylinder bore78.4 mm (3.09 in)
81 mm (3.19 in)
81.5 mm (3.21 in)
Piston stroke77.5 mm (3.05 in)
89 mm (3.5 in)
95.8 mm (3.77 in)
Block materialCast iron
Head materialAluminum
ValvetrainSOHC, DOHC 4 valves x cyl. with MIVEC (some versions)
Compression ratio8.5:1, 9.5:1, 10.0:1, 10.5:1, 11.0:1, 12.0:1
TurbochargerTD04 (on 4G93T)
Fuel systemDirect injection
Fuel typeGasoline
Cooling systemWater cooled
Power output94–215 PS (69–158 kW; 93–212 hp)
Torque output126–284 N⋅m (93–209 lb⋅ft)

The Mitsubishi 4G9 engine is a series of straight-4 automobile engines produced by Mitsubishi Motors. All are 16-valve, and use both single- and double- overhead camshaft heads. Some feature MIVEC variable valve timing, and it was the first modern gasoline direct injection engine upon its introduction in August 1996.


The 4G91 uses a bore and stroke of 78.4 mm × 77.5 mm (3.09 in × 3.05 in) for a total displacement of 1.5 L (1,496 cc). With a 9.5:1 compression ratio and DOHC, four-valve-per-cylinder head and multi-point EFI, this engine produces 115 PS (85 kW; 113 hp) at 6,000 rpm and 135 N⋅m (100 lb⋅ft) at 5,000 rpm.[1] The 4G91 was a short-lived model, mainly built between 1991 and 1995 and rarely seen in export markets. There was also a carbureted model, with 97 PS (71 kW; 96 hp) at 6,000 rpm and 126 N⋅m (93 lb⋅ft) at 3,500 rpm.[1]



The 4G92 displaces 1.6 L (1,597 cc). It first appeared in the late-1991 Japanese-spec Mirage RS and Super R in DOHC form. The 4G92 is basically a version of the 4G91 with the bore increased to 81 mm (3.19 in). In the original DOHC 16V form it produces 120 PS (88 kW; 118 hp). Later, a fuel-efficient SOHC version was added, but the 4G92 is best known in its high-performance MIVEC equipped DOHC version, which fully replaced "ordinary" DOHC in 1993. Power output was raised as high as 170 PS (125 kW; 168 hp), as found in the JDM Mirage Cyborg-ZR and 1992 Lancer MR, making it one of the most powerful 1.6-litre naturally aspirated engines. A modular displacement (MD) version of the 4G92 MIVEC was also produced – MD is Mitsubishi's cylinder deactivation system which helps improve fuel consumption.

4G92P SOHC 16 Valve

4G92 DOHC 16 Valve

4G92-MIVEC DOHC 16 Valve



The turbocharged 4G93 engine in a Mitsubishi Libero GT.
The turbocharged 4G93 engine in a Mitsubishi Libero GT.

The 4G93 is a 1.8 L (1,834 cc) engine available in both SOHC and DOHC versions. Turbocharged variants are also produced. In mid 1996 Mitsubishi released a gasoline direct injection (GDI) version of the 4G93. This GDI model saw a production of over a million units though it was a heavy polluter therefore only sold in the Japanese market. A partially cleaned up version (with less power) was later sold in Europe, and was among the first of the modern GDI engines. It brought good fuel economy and, if well serviced, long engine life.

4G93 SOHC 16 Valve MPI

4G93 SOHC 16 Valve Carburetor

4G93 DOHC 16 Valve MPI

4G93T DOHC 16 Valve Turbo

4G93 DOHC 16 Valve GDI

4G93 DOHC 16 Valve GDI Turbo



The 4G94 is a 2.0 L (1,999 cc) version built in Japan, used in the Mitsubishi Lancer. It has a cast iron engine block with Multi-point fuel injection and an aluminum SOHC cylinder head with forged steel connecting rods and four valves per cylinder. The 4G94 Also comes in the GDI DOHC variant which can be found in the Mitsubishi Galant.

4G94 SOHC 16 Valve MPI

4G94 DOHC 16 Valve GDI



See also


  1. ^ a b Büschi, Hans-Ulrich, ed. (10 March 1994). Automobil Revue 1994 (in German and French). Vol. 89. Berne, Switzerland: Hallwag AG. p. 388. ISBN 3-444-00584-9.