The Mitsubishi 4G9 engine is a series of

straight-4 A straight-four engine (also referred to as an inline-four engine) is a four-cylinder piston engine where cylinders are arranged in a line along a common crankshaft. The majority of automotive four-cylinder engines use a straight-four layout ( ...

automobile A car, or an automobile, is a motor vehicle with wheels. Most definitions of cars state that they run primarily on roads, Car seat, seat one to eight people, have four wheels, and mainly transport private transport#Personal transport, peopl ...

engines produced by

Mitsubishi Motors is a Japanese Multinational corporation, multinational Automotive industry, automobile manufacturer headquartered in Minato, Tokyo, Japan.

. All are 16-valve, and use both single- and double- overhead camshaft heads. Some feature ''

MIVEC MIVEC (Mitsubishi Innovative Valve timing Electronic Control system) is the brand name of a variable valve timing (VVT) engine technology developed by Mitsubishi Motors. MIVEC, as with other similar systems, varies the timing of the intake and ex ...

variable valve timing Variable valve timing (VVT) is the process of altering the timing of a Poppet valve, valve lift event in an internal combustion engine, and is often used to improve performance, fuel economy or emissions. It is increasingly being used in combina ...

, and it was the first modern

gasoline direct injection Gasoline direct injection (GDI), also known as petrol direct injection (PDI), is a fuel injection system for internal combustion engines that run on gasoline (petrol) which injects fuel directly into the combustion chamber. This is distinct f ...

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 Revolutions per minute (abbreviated rpm, RPM, rev/min, r/min, or r⋅min−1) is a unit of rotational speed (or rotational frequency) for rotating machines. One revolution per minute is equivalent to hertz. Standards ISO 80000-3:2019 def ...

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

and at 3,500 rpm. Applications *

Mitsubishi Lancer The Mitsubishi Lancer is an automobile that was produced by the Japanese manufacturer Mitsubishi Motors from 1973 until 2024. The Lancer has been marketed as the Colt Lancer, Dodge Colt, Plymouth Colt, Chrysler Valiant Lancer, Chrysler Lancer, ...

Mitsubishi Mirage The Mitsubishi Mirage is a range of cars produced by the Japanese manufacturer Mitsubishi from 1978 until 2003 and again from 2012 to 2024. The hatchback models produced between 1978 and 2003 were classified as subcompact cars, while the sedan ...

* Proton Wira

4G92

The ''4G92'' displaces . It first appeared in the late-1991 Japanese-spec Mirage RS and Super R in

DOHC An overhead camshaft (OHC) engine is a piston engine in which the camshaft is located in the cylinder head above the combustion chamber. This contrasts with earlier overhead valve engines (OHV), where the camshaft is located below the combus ...

form. The 4G92 is basically a version of the ''4G91'' with the bore increased to . In the original DOHC 16V form it produces . Later, a fuel-efficient

SOHC An overhead camshaft (OHC) engine is a piston engine in which the camshaft is located in the cylinder head above the combustion chamber. This contrasts with earlier overhead valve engines (OHV), where the camshaft is located below the combus ...

version was added, but the 4G92 is best known in its high-performance ''

'' equipped

version, which fully replaced "ordinary"

in 1993. Power output was raised as high as , as found in the JDM Mirage Cyborg-ZR and 1992 Lancer MR, making it one of the most powerful 1.6-litre

naturally aspirated engine A naturally aspirated engine, also known as a normally aspirated engine, and abbreviated to N/A or NA, is an internal combustion engine in which air intake depends solely on atmospheric pressure and does not have forced induction through a turboc ...

s. A modular displacement (MD) version of the 4G92

was also produced – MD is Mitsubishi's

cylinder deactivation Variable displacement is an automobile engine technology that allows the engine displacement to change, usually by deactivating cylinders, for improved fuel economy. The technology is primarily used in large multi-cylinder engines. Many automobil ...

system which helps improve fuel consumption. 4G92P

16 Valve * Total Displacement - * Bore - * Stroke - * Compression Ratio - 10.0:1 * Maximum Output (1) - at 6,000 rpm, and at 5,000 rpm * Maximum Output (2) - at 5,500 rpm, and 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

16 Valve * Total Displacement - * Bore - * Stroke - * Compression Ratio - 11.0:1 * Maximum Output - at 7,000 rpm * Maximum Torque - at 4,500 rpm 4G92-MIVEC

16 Valve * Total Displacement - * Bore - * Stroke - * Compression Ratio - 11.0:1 * Maximum Output - at 7,500 rpm * Maximum Torque - at 7,000 rpm Applications *

* Mitsubishi Carisma *

Mitsubishi Delica The is a range of vans and pickup trucks designed and built by the Japanese automaker Mitsubishi Motors since 1968. It was originally based on a cabover van and pickup truck introduced the previous year, also called the Delica, its name a c ...

* Proton Wira * Proton Satria

4G93

The 4G93 is a engine available in both

and

versions.

Turbocharged In an internal combustion engine, a turbocharger (also known as a turbo or a turbosupercharger) is a forced induction device that is powered by the flow of exhaust gases. It uses this energy to compress the intake air, forcing more air into the ...

variants are also produced. In mid 1996 Mitsubishi released a

(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

16 Valve MPI * Multi-Point Injection (MPI) * Total Displacement - * Bore - * Stroke - * Compression Ratio - 9.5:1 * Maximum Output - * Maximum Torque - 4G93

16 Valve Carburetor * Carburetor * Total Displacement - * Bore - * Stroke - * Compression Ratio - 9.5:1 * Maximum Output - * Maximum Torque - 4G93

16 Valve MPI * Multi-Point Injection (MPI) * Total Displacement - * Bore - * Stroke - * Compression Ratio - 10.5:1 * Maximum Output - @ 6,500

* Maximum Torque - @ 5500

4G93T

16 Valve Turbo * Multi-Point Injection (MPI) with TD04 turbocharger * Total Displacement - * Bore - * Stroke - * Compression Ratio - 8.5:1 (Upgraded to 9.1:1 in 1994) * Maximum Output - at 6,000

(Upgraded to in 1994, and again to in 1995) * Maximum Torque - at 3,000

(Upgraded to in 1994, and again to in 1995) 4G93

16 Valve GDI * Gasoline Direct Injection (GDI) * Total Displacement - * Bore - * Stroke - * Compression Ratio - 12.0:1 * Maximum Output - ** Europe: at 5,250

/ at 5,500

/ at 5,500 rpm ** Japan: at 5,500

/ at 6,000

/ at 6,500

* Maximum Torque - ** Europe: @ 3,500

/ @ 3,750

** Japan: @ 3,500

/ @ 3,750

/ @ 5,000

4G93

16 Valve GDI Turbo * Gasoline Direct Injection (GDI) with turbocharger * Total Displacement - * Bore - * Stroke - * Compression Ratio - 10.0:1 * Maximum Output - @ 5,200

/ @ 5,500

* Maximum Torque - @ 3,500

/ @ 3,500

Applications *

Mitsubishi Space Wagon The is a group of autonomous Japanese multinational companies in a variety of industries. Founded by Yatarō Iwasaki in 1870, the Mitsubishi Group traces its origins to the Mitsubishi zaibatsu, a unified company that existed from 1870 to 1946 ...

Mitsubishi Space Star The Mitsubishi Space Star is a car produced by the Japanese manufacturer Mitsubishi Motors from either 1998 or 1999 until 2005. Described as a hatchback, a compact people carrier, or a micro MPV, it was built at the NedCar factory in the Nether ...

* Mitsubishi Carisma *

* Mitsubishi Libero *

Mitsubishi FTO The Mitsubishi FTO is a Front mid-engine, front-wheel-drive layout, front mid-engined, front-wheel drive coupe produced by Mitsubishi Motors between 1994 and 2000. Originally planned exclusively for the Japanese domestic market, its popularity as ...

* Proton Wira * Proton Satria * Proton Putra *

Mitsubishi Colt The Mitsubishi Colt is a nameplate from Mitsubishi Motors that has been applied to a number of automobiles since 1962. It was first introduced with a series of Kei car, kei and subcompact cars in the 1960s, and then for the export version of the ...

GTI *

Mitsubishi Galant The is an automobile which was produced by Japanese manufacturer Mitsubishi from 1969 until 2012. The model name was derived from the French word ''galant'', meaning "chivalrous". There have been nine distinct generations with total cumulative ...

1996 * Mitsubishi Pajero iO / Pajero Pinin / Shogun Pinin / Montero iO / Pajero TR4 * Brilliance BC3 * Brilliance BS6 * Brilliance BS4 * Volvo S40/V40

4G94

The 4G94 is a version built in

Japan Japan is an island country in East Asia. Located in the Pacific Ocean off the northeast coast of the Asia, Asian mainland, it is bordered on the west by the Sea of Japan and extends from the Sea of Okhotsk in the north to the East China Sea ...

, used in the

. It has a cast iron engine block with

Multi-point fuel injection Fuel injection is the introduction of fuel in an internal combustion engine, most commonly automotive engines, by the means of a fuel injector. This article focuses on fuel injection in reciprocating piston and Wankel rotary engines. All co ...

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

16 Valve MPI *Multi-Point Injection (MPI) *Total Displacement - *Bore - *Stroke - *Compression Ratio - 9.5:1 *Maximum Output - @ 5,200

*Maximum Torque - @ 4,250

4G94

16 Valve GDI *Gasoline Direct Injection (GDI) *Bore - *Stroke - *Compression Ratio: 11.0:1 *Maximum Output: / 5,700 rpm *Maximum Torque: / 3,750 rpm Applications Applications * Mitsubishi Pajero iO / Pajero Pinin / Shogun Pinin / Montero iO / Pajero TR4 * Mitsubishi Adventure/Mitsubishi Kuda/Mitsubishi Freeca/Soueast Freeca *

Hyundai Santa Fe The Hyundai Santa Fe () is an automobile nameplate used by the South Korean manufacturer Hyundai since 2000, specifically for a series of crossover SUVs. It is named after the city of Santa Fe, New Mexico, and was introduced for the 2001 model ...

References

"The Mitsubishi 4G9x Engine Guide"
Michael Knowling, ''Autospeed'', issue 389, July 17, 2006

Mitsubishi Motors press release, September 11, 2001 {{Mitsubishi Motors technologies 4G9 Straight-four engines Gasoline engines by model

4G91

4G92

4G93

4G94

See also

References