The4G91 uses a bore and stroke of 78.4 mm × 77.5 mm (3.09 in × 3.05 in) for a total displacement of 1.5 L (1,496 cc). With a 9.5:1 compression ratio and DOHC, four-valve-per-cylinder head andmulti-point EFI, this engine produces 115 PS (85 kW; 113 hp) at 6,000 rpm and 135 N⋅m (100 lb⋅ft) 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; 96 hp) at 6,000 rpm and 126 N⋅m (93 lb⋅ft) at 3,500 rpm.[1]
The4G92 displaces 1.6 L (1,597 cc). It first appeared in the late-1991 Japanese-spec Mirage RS and Super R inDOHC form. The 4G92 is basically a version of the4G91 with the bore increased to 81 mm (3.19 in). In the original DOHC 16V form it produces 120 PS (88 kW; 118 hp). Later, a fuel-efficientSOHC version was added, but the 4G92 is best known in its high-performanceMIVEC equippedDOHC version, which fully replaced "ordinary"DOHC in 1993. Power output was raised as high as 170 PS (125 kW; 168 hp), as found in theJDM Mirage Cyborg-ZR and 1992 Lancer MR, making itone of the most powerful 1.6-litrenaturally aspirated engines. A modular displacement (MD) version of the 4G92MIVEC was also produced – MD is Mitsubishi'scylinder deactivation system which helps improve fuel consumption.
The 4G93 is a 1.8 L (1,834 cc) engine available in bothSOHC andDOHC versions.Turbocharged variants are also produced. In mid 1996 Mitsubishi released agasoline 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.
The4G94 is a 2.0 L (1,999 cc) version built inJapan, used in theMitsubishi Lancer. It has a cast iron engine block withMulti-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.
^abBüschi, Hans-Ulrich, ed. (10 March 1994).Automobil Revue 1994 (in German and French). Vol. 89. Berne, Switzerland: Hallwag AG. p. 388.ISBN3-444-00584-9.
