Mitsubishi 4G9 engine

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4G9
Mitsubishi 4G94.jpg
Overview
Manufacturer Mitsubishi Motors
Production 1991-2007
Combustion chamber
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[edit]

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.[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) at 6,000 rpm and 126 N·m (93 ft·lbf) at 3,500 rpm.[1]

Applications

4G92[edit]

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

4G92 DOHC 16 Valve

  • 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

4G92-MIVEC DOHC 16 Valve

  • 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

Applications

4G93[edit]

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 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 suffered from poor fuel economy and engine life.

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)
  • Maximum Torque - 159 N·m (117 ft·lbf)

4G93 SOHC 16 Valve Carburetor

  • 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)

4G93 DOHC 16 Valve MPI

  • 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

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 -
    • Europe: 88 kW (120 PS; 118 bhp) @ 5,250 rpm / 90 kW (122 PS; 121 bhp) @ 5,500 rpm / 92 kW (125 PS; 123 bhp) @ 5,500 rpm
    • Japan: 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 -
    • Europe: 174 N·m (128 ft·lbf) @ 3,500 rpm / 174 N·m (128 ft·lbf) @ 3,750 rpm
    • Japan: 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

Applications

4G94[edit]

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

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 - 81.5mm
  • Stroke - 95.8mm
  • 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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See also[edit]

References[edit]

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