Mitsubishi 4G9 engine

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 bore and stroke of 78.4x77.5 mm for a total displacement of 1496 cc. With a 9.5:1 compression ratio and DOHC, four-valve-per-cylinder head and multi-point EFI, this engine produces 115 PS at 6,000 rpm and 135 Nm 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 at 6,000 rpm and 126 Nm at 3,500 rpm.

Applications
 * Mitsubishi Lancer
 * Mitsubishi Mirage
 * Proton Wira

4G92
The 4G92 displaces 1597 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. In the original DOHC 16V form it produces 120 PS. 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, 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
 * Total Displacement - 1597 cc
 * Bore - 81 mm
 * Stroke - 77.5 mm
 * Compression Ratio - 10.0:1
 * Maximum Output (1) - 83 kW at 6,000 rpm, and 137 Nm at 5,000 rpm
 * Maximum Output (2) - 69 kW at 5,500 rpm, and 135 Nm 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

4G92 DOHC 16 Valve
 * Total Displacement - 1597 cc
 * Bore - 81 mm
 * Stroke - 77.5 mm
 * Compression Ratio - 11.0:1
 * Maximum Output - 145 PS at 7,000 rpm
 * Maximum Torque - 149 Nm at 4,500 rpm

4G92-MIVEC DOHC 16 Valve
 * Total Displacement - 1597 cc
 * Bore - 81 mm
 * Stroke - 77.5 mm
 * Compression Ratio - 11.0:1
 * Maximum Output - 125 kW at 7,500 rpm
 * Maximum Torque - 167 Nm at 7,000 rpm

Applications
 * Mitsubishi Lancer
 * Mitsubishi Mirage
 * Mitsubishi Carisma
 * Mitsubishi Delica
 * Proton Wira
 * Proton Satria

4G93
The 4G93 is a 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 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
 * Multi-Point Injection (MPI)
 * Total Displacement - 1834 cc
 * Bore - 81 mm
 * Stroke - 89 mm
 * Compression Ratio - 9.5:1
 * Maximum Output - 86 kW
 * Maximum Torque - 166 Nm

4G93 SOHC 16 Valve Carburetor
 * Carburetor
 * Total Displacement - 1834 cc
 * Bore - 81 mm
 * Stroke - 89 mm
 * Compression Ratio - 9.5:1
 * Maximum Output - 74 kW
 * Maximum Torque - 154 Nm

4G93 DOHC 16 Valve MPI
 * Multi-Point Injection (MPI)
 * Total Displacement - 1834 cc
 * Bore - 81 mm
 * Stroke - 89 mm
 * Compression Ratio - 10.5:1
 * Maximum Output - 103 kW @ 6,500 rpm
 * Maximum Torque - 167 Nm @ 5500 rpm

4G93T DOHC 16 Valve Turbo
 * Multi-Point Injection (MPI) with TD04 turbocharger
 * Total Displacement - 1834 cc
 * Bore - 81 mm
 * Stroke - 89 mm
 * Compression Ratio - 8.5:1 (Upgraded to 9.1:1 in 1994)
 * Maximum Output - 195 PS at 6,000 rpm (Upgraded to 205 PS in 1994, and again to 215 PS in 1995)
 * Maximum Torque - 270 Nm at 3,000 rpm (Upgraded to 275 Nm in 1994, and again to 284 Nm in 1995)

4G93 DOHC 16 Valve GDI
 * Gasoline Direct Injection (GDI)
 * Total Displacement - 1834 cc
 * Bore - 81 mm
 * Stroke - 89 mm
 * Compression Ratio - 12.0:1
 * Maximum Output -
 * Europe: 120 PS at 5,250 rpm / 122 PS at 5,500 rpm / 125 PS at 5,500 rpm
 * Japan: 130 PS at 5,500 rpm / 130 PS at 6,000 rpm / 150 PS at 6,500 rpm
 * Maximum Torque -
 * Europe: 174 Nm @ 3,500 rpm / 174 Nm @ 3,750 rpm
 * Japan: 181 Nm @ 3,500 rpm / 177 Nm @ 3,750 rpm / 178 Nm @ 5,000 rpm

4G93 DOHC 16 Valve GDI Turbo
 * Gasoline Direct Injection (GDI) with turbocharger
 * Total Displacement - 1834 cc
 * Bore - 81 mm
 * Stroke - 89 mm
 * Compression Ratio - 10.0:1
 * Maximum Output - 118 kW @ 5,200 rpm / 121 kW @ 5,500 rpm
 * Maximum Torque - 220 Nm @ 3,500 rpm / 220 Nm @ 3,500 rpm

Applications
 * Mitsubishi Space Wagon
 * Mitsubishi Space Star
 * Mitsubishi Carisma
 * Mitsubishi Lancer
 * Mitsubishi Libero
 * Mitsubishi Mirage
 * Mitsubishi FTO
 * Proton Wira
 * Proton Satria
 * Proton Putra
 * Mitsubishi Colt GTI
 * Mitsubishi Galant 1996
 * Mitsubishi Pajero iO / Pajero Pinin / Shogun Pinin / Montero iO / Pajero TR4
 * Brilliance BC3
 * Brilliance BS6
 * Brilliance BS4
 * Volvo S40
 * Volvo V40

4G94
The 4G94 is a 1999 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
 * Multi-Point Injection (MPI)
 * Total Displacement - 1999 cc
 * Bore - 81.5 mm
 * Stroke - 95.8 mm
 * Compression Ratio - 9.5:1
 * Maximum Output - 92 kW @ 5,200 rpm
 * Maximum Torque - 176 Nm @ 4,250 rpm

4G94 DOHC 16 Valve GDI Applications
 * Gasoline Direct Injection (GDI)
 * Bore - 81.5 mm
 * Stroke - 95.8 mm
 * Compression Ratio: 11.0:1
 * Maximum Output: 107 kW / 5,700 rpm
 * Maximum Torque: 19.5 kgm / 3,750 rpm

Applications
 * Mitsubishi Pajero iO / Pajero Pinin / Shogun Pinin / Montero iO / Pajero TR4
 * Mitsubishi Adventure/Mitsubishi Kuda/Mitsubishi Freeca/Soueast Freeca
 * Mitsubishi Lancer
 * Mitsubishi Galant
 * Hyundai Santa Fe