Mitsubishi 4G9 engine

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. 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.

4G93 SOHC 16 Valve MPI

• Multi-Point Injection (MPI)
• Total Displacement - 1999cc
• Bore - 81.5mm
• Stroke - 95.8mm
• Compression Ratio - 9.5:1
• Maximum Output - 92 kW (125 PS; 123 bhp) @ 5,200 rpm
• Maximum Torque - 176 N·m (130 ft·lbf) @ 4,250 rpm

The 4G94 Also comes in the GDI DOHC variant which can be found in the Mitsubishi Galant.

4G94 DOHC 16 Valve GDI

• Gasoline Direct Injection (GDI)
• Bore - 81.5
• Stroke - 95.8
• Compression Ratio: 11.0
• Maximum Output: 145 PS (106.65 kW) / 5,700 rpm
• Maximum Torque: 19.5 kg/m (191.23 N/m) / 3,750 rpm

See also

• List of Mitsubishi engines

References

• "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