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 for a total displacement of. With a 9.5:1 compression ratio and DOHC, four-valve-per-cylinder head and multi-point EFI, this engine produces at 6,000 rpm and 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 at 6,000 rpm and at 3,500 rpm.
Applications
The 4G92 displaces. First appeared in late 1991 Japanese spec Mirage RS and Super R in DOHC form, it is basically bored out to and tuned version of the 4G91 producing. 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, 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 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 engine available in both SOHC and DOHC versions. Turbocharged variants are also produced. In mid 1996 Mitsubishi released a gasoline direct injection 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 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 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.
4G94 SOHC 16 Valve MPI
The 4G94 Also comes in the GDI DOHC variant which can be found in the Mitsubishi Galant.
4G94 DOHC 16 Valve GDI
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Applications