4G9

Manufacturer	Mitsubishi Motors
Production	1991-2007
Cylinder block alloy	Cast iron

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.

4G91

The 4G91 uses a 78.4 mm bore and 77.5 mm stroke for a total displacement of 1.5 litres. With a 9.5:1 compression ratio and DOHC, four-valve-per-cylinder head and multi-point EFI, this engine produces 84 kW (114 PS; 113 bhp) at 6000 rpm and 135 N·m (100 ft·lbf) at 5000 rpm

Applications

• Mitsubishi Lancer
• Mitsubishi Mirage

4G92

The 4G92 displaces 1.6 L (1597 cc). First appeared in late 1991 Japanese spec Mirage RS and Super R in DOHC form, it is basically bored out to 81 mm and tuned version of the 4G91 producing 145 hp (108 kW). Later was introduced fuel-efficient SOHC version. But 4G92 is best known of its high-performance MIVEC equipped DOHC version, which fully replaced "ordinary" DOHC in 1993. Power output raised as high as 172 hp (128 kW), as found in the Mirage Cyborg-ZR and JDM ’92 Lancer MR, making it one of the most powerful 1.6 L N/A 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

• Total Displacement - 1597cc
• Bore - 81.0mm
• Stroke - 77.5mm
• Compression Ratio - 10:1
• Maximum Output (1) - 83 kW (113 PS; 111 bhp) @ 6,000 rpm & 137 N·m (101 ft·lbf) @ 5,000 rpm
• Maximum Output (2) - 69 kW (94 PS; 93 bhp) @ 5,500 rpm & 135 N·m (100 ft·lbf) @ 4,000 rpm
  • (1): Early European and JDM versions with 20°/42° intake and 54°/2° exhaust valve timing
  • (2): General export and later European versions with 14°/58° intake and 52°/16° exhaust valve timing

4G92 DOHC 16 Valve

• Total Displacement - 1597cc
• Bore - 81.0mm
• Stroke - 77.5mm
• Compression Ratio - 11:1
• Maximum Output - 108 kW (147 PS; 145 bhp) @ 7000 rpm
• Maximum Torque - 149 N·m (110 ft·lbf) @ 4500 rpm

4G92-MIVEC DOHC 16 Valve

• Total Displacement - 1597cc
• Bore - 81.0mm
• Stroke - 77.5mm
• Compression Ratio - 11:1
• Maximum Output - 128 kW (174 PS; 172 bhp) @ 7,500 rpm
• Maximum Torque - 167 N·m (123 ft·lbf) @ 7,000 rpm

Applications

• Mitsubishi Lancer
• Mitsubishi Mirage
• Proton Satria
• Proton Wira
• Mitsubishi Carisma

4G93

4G93 from a 1996 Mitsubishi Lancer GSR (turbo AWD)

The 4G93 is 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 of over a million units, and was the first of the modern GDI engines.

4G93 SOHC 16 Valve MPI

• Multi-Point Injection (MPI)
• Total Displacement - 1834cc
• Bore - 81.0mm
• Stroke - 89.0mm
• Compression Ratio - 9.5:1
• Maximum Output - 88 kW (120 PS; 118 bhp) (Upgraded to 103 kW (140 PS; 138 bhp) in 1994)
• Maximum Torque - 159 N·m (117 ft·lbf) (Upgraded to 167 N·m (123 ft·lbf) in 1994)

4G93 SOHC 16 Valve Carburettor

• Carburettor
• Total Displacement - 1834cc
• Bore - 81.0mm
• Stroke - 89.0mm
• Compression Ratio - 9.5:1
• Maximum Output - 81 kW (110 PS; 109 bhp)
• Maximum Torque - 154 N·m (114 ft·lbf)

4G93T DOHC 16 Valve Turbo

• Multi-Point Injection (MPI) with TD04 turbocharger
• Total Displacement - 1834cc
• Bore - 81.0mm
• Stroke - 89.0mm
• Compression Ratio - 8.5:1 (Upgraded to 9.1:1 in 1994)
• Maximum Output - 143 kW (194 PS; 192 bhp) @ 6,000 rpm (Upgraded to 151 kW (205 PS; 202 bhp) in 1994, and again to 158 kW (215 PS; 212 bhp) in 1995)
• Maximum Torque - 270 N·m (200 ft·lbf) @ 3,000 rpm (Upgraded to 275 N·m (203 ft·lbf) in 1994, and again to 284 N·m (209 ft·lbf) in 1995)

4G93 DOHC 16 Valve GDI

• Gasoline Direct Injection (GDI)
• Total Displacement - 1834cc
• Bore - 81.0mm
• Stroke - 89.0mm
• Compression Ratio - 12.0:1
• Maximum Output - 96 kW (131 PS; 129 bhp) @ 5,500 rpm / 96 kW (131 PS; 129 bhp) @ 6,000 rpm / 110 kW (150 PS; 148 bhp) @ 6,500 rpm
• Maximum Torque - 181 N·m (133 ft·lbf) @ 3,500 rpm / 177 N·m (131 ft·lbf) @ 3,750 rpm / 178 N·m (131 ft·lbf) @ 5,000 rpm

4G93 DOHC 16 Valve GDI Turbo

• Gasoline Direct Injection (GDI) with turbocharger
• Total Displacement - 1834cc
• Bore - 81.0mm
• Stroke - 89.0mm
• Compression Ratio - 10.0:1
• Maximum Output - 118 kW (160 PS; 158 bhp) @ 5,200 rpm / 121 kW (165 PS; 162 bhp) @ 5,500 rpm
• Maximum Torque - 220 N·m (160 ft·lbf) @ 3,500 rpm / 220 N·m (160 ft·lbf) @ 3,500 rpm

4G94

The 4G94 is a 2.0 L (1,999 cc) version built in Japan, used in the Mitsubishi Lancer. Bore is 81.5 mm and stroke is 95.8 mm, with a compression ratio of 9.5:1. Output is 92 kW (125 PS; 123 bhp) at 5,500 rpm with 176 N·m (130 ft·lbf) of torque at 4,250 rpm. It has a cast iron engine block with MPFI (fuel injection) and an aluminum SOHC cylinder head with forged steel connecting rods and four valves per cylinder.

4G94 Also comes in the GDI DOHC variant which can be found in the Mitsubishi Galant. Specifications: Bore: 81.5 Stroke: 95.8 Compression ratio: 11.0 Max power: 145 PS (106.65 kW) / 5,700 rpm Max torque: 19.5 kg/m (191.23 N/m) / 3,750 rpm

See also

• List of Mitsubishi engines

• "The Mitsubishi 4G9x Engine Guide", Michael Knowling, Autospeed, issue 389, July 17, 2006
• "GDI engine production tops 1,000,000 unit mark", Mitsubishi Motors press release, September 11, 2001