| Mitsubishi 4G9 engine | |
| Manufacturer: | Mitsubishi Motors |
| Configuration: | Straight-4 |
| Production: | 1991–2007 |
| Fueltype: | Gasoline |
| Fuelsystem: | Direct injection |
| Coolingsystem: | Water cooled |
| Head: | Aluminum |
| Block: | Cast iron |
| Valvetrain: | SOHC, DOHC 4 valves x cyl. with MIVEC (some versions) |
| Compression: | 8.5:1, 9.5:1, 10.0:1, 10.5:1, 11.0:1, 12.0:1 |
| Turbocharger: | TD04 (on 4G93T) |
| Displacement: | 1496cc 1597cc 1834cc 1999cc |
| Bore: | 78.4mm 81mm 81.5mm |
| Stroke: | 77.5mm 89mm 95.8mm |
| Power: | NaN0NaN0 |
| Torque: | NaN0NaN0 |
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.
The 4G91 uses a bore and stroke of NaNmm for a total displacement of 1496cc. With a 9.5:1 compression ratio and DOHC, four-valve-per-cylinder head and multi-point EFI, this engine produces 1150NaN0 at 6,000 rpm and 1350NaN0 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 970NaN0 at 6,000 rpm and 1260NaN0 at 3,500 rpm.[1]
Applications
The 4G92 displaces 1597cc. 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 81mm. In the original DOHC 16V form it produces 1200NaN0. 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 1700NaN0, 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
4G92 DOHC 16 Valve
4G92-MIVEC DOHC 16 Valve
Applications
The 4G93 is a 1834cc 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
4G93 SOHC 16 Valve Carburetor
4G93 DOHC 16 Valve MPI
4G93T DOHC 16 Valve Turbo
4G93 DOHC 16 Valve GDI
4G93 DOHC 16 Valve GDI Turbo
Applications
The 4G94 is a 1999cc 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
4G94 DOHC 16 Valve GDI
Applications
Applications