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 L (1,496 cubic centimetres). 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) at 6,000 rpm and 135 N�m (100 ft�lbf) at 5,000 rpm. 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) at 6,000 rpm and 126 N�m (93 ft�lbf) at 3,500 rpm.
Applications
- Mitsubishi Lancer
- Mitsubishi Mirage
The 4G92 displaces 1.6 L (1,597 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 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
- Total Displacement - 1,597 cc
- Bore - 81.0 mm
- Stroke - 77.5 mm
- Compression Ratio - 10:1
- Maximum Output (1) - 83 kW (113 PS; 111 bhp) at 6,000 rpm, and 137 N�m (101 ft�lbf) at 5,000 rpm
- Maximum Output (2) - 69 kW (94 PS; 93 bhp) at 5,500 rpm, and 135 N�m (100 ft�lbf) at 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
- Total Displacement - 1,597 cc
- Bore - 81.0 mm
- Stroke - 77.5 mm
- Compression Ratio - 11:1
- Maximum Output - 108 kW (147 PS; 145 bhp) at 7,000 rpm
- Maximum Torque - 149 N�m (110 ft�lbf) at 4,500 rpm
- Total Displacement - 1,597 cc
- Bore - 81.0 mm
- Stroke - 77.5 mm
- Compression Ratio - 11:1
- Maximum Output - 128 kW (174 PS; 172 bhp) at 7,500 rpm
- Maximum Torque - 167 N�m (123 ft�lbf) at 7,000 rpm
- Mitsubishi Lancer
- Mitsubishi Mirage
- Proton Satria
- Proton Wira
- Mitsubishi Carisma
The 4G93 is a 1.8L (1834 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, 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-113 bhp
- Maximum Torque - 159Nm-116 ft/lbs
- Carburetor
- 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)
- Multi-Point Injection (MPI)
- Total Displacement - 1834cc
- Bore - 81.0mm
- Stroke - 89.0mm
- Compression Ratio - 10.5:1
- Maximum Output - 103 kW (140 PS; 138 bhp) @ 6,500 rpm
- Maximum Torque - 167 N�m (123 ft�lbf) @ 5500 rpm
- 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)
- 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
- 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
- Mitsubishi Space Wagon
- Mitsubishi Space Star
- Mitsubishi Carisma
- Mitsubishi Lancer
- Mitsubishi Mirage
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.
4G94 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
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
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