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

automobile A car or automobile is a motor vehicle with wheels. Most definitions of ''cars'' say that they run primarily on roads, seat one to eight people, have four wheels, and mainly transport people instead of goods. The year 1886 is regarded ...

Mitsubishi Motors is a Japanese multinational automobile manufacturer headquartered in Minato, Tokyo, Japan.single- and double- overhead camshaft heads. Some feature '' MIVEC''

variable valve timing In internal combustion engines, variable valve timing (VVT) is the process of altering the timing of a valve lift event, and is often used to improve performance, fuel economy or emissions. It is increasingly being used in combination with varia ...

, and it was the first modern

gasoline direct injection Gasoline direct injection (GDI), also known as petrol direct injection (PDI), is a mixture formation system for internal combustion engines that run on gasoline (petrol), where fuel is injected into the combustion chamber. This is distinct ...

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 *

Mitsubishi Lancer The Mitsubishi Lancer is an automobile produced by the Japanese manufacturer Mitsubishi Motors since 1973. The Lancer has been marketed as the Colt Lancer, Dodge Colt, Plymouth Colt, Chrysler Valiant Lancer, Chrysler Lancer, Eagle Summit, ...

*

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

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 where 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 combustion ch ...

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 where 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 combustion ch ...

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

DOHC An overhead camshaft (OHC) engine is a piston engine where 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 combustion ch ...

version, which fully replaced "ordinary"

DOHC An overhead camshaft (OHC) engine is a piston engine where 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 combustion ch ...

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 Naturally may refer to: ;Albums * '' Naturally!'', an album by Nat Adderley * ''Naturally'' (Houston Person album) * ''Naturally'' (J. J. Cale album) * ''Naturally'' (John Pizzarelli album) * ''Naturally'' (Sharon Jones album) * ''Naturally'' ...

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

system which helps improve fuel consumption. 4G92P

SOHC An overhead camshaft (OHC) engine is a piston engine where 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 combustion ch ...

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

DOHC An overhead camshaft (OHC) engine is a piston engine where 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 combustion ch ...

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

DOHC An overhead camshaft (OHC) engine is a piston engine where 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 combustion ch ...

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 Lancer The Mitsubishi Lancer is an automobile produced by the Japanese manufacturer Mitsubishi Motors since 1973. The Lancer has been marketed as the Colt Lancer, Dodge Colt, Plymouth Colt, Chrysler Valiant Lancer, Chrysler Lancer, Eagle Summit, ...

*

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

* Mitsubishi Carisma * Proton Wira * Proton Satria

4G93

The 4G93 is a engine available in both

SOHC An overhead camshaft (OHC) engine is a piston engine where 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 combustion ch ...

and

DOHC An overhead camshaft (OHC) engine is a piston engine where 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 combustion ch ...

versions.

Turbocharged In an internal combustion engine, a turbocharger (often called a turbo) is a forced induction device that is powered by the flow of exhaust gases. It uses this energy to compress the intake gas, forcing more air into the engine in order to pro ...

variants are also produced. In mid 1996 Mitsubishi released a

gasoline direct injection Gasoline direct injection (GDI), also known as petrol direct injection (PDI), is a mixture formation system for internal combustion engines that run on gasoline (petrol), where fuel is injected into the combustion chamber. This is distinct ...

(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 An overhead camshaft (OHC) engine is a piston engine where 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 combustion ch ...

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

SOHC An overhead camshaft (OHC) engine is a piston engine where 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 combustion ch ...

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

DOHC An overhead camshaft (OHC) engine is a piston engine where 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 combustion ch ...

16 Valve MPI * Multi-Point Injection (MPI) * Total Displacement - * Bore - * Stroke - * Compression Ratio - 10.5:1 * Maximum Output - @ 6,500 rpm * Maximum Torque - @ 5500 rpm 4G93T

DOHC An overhead camshaft (OHC) engine is a piston engine where 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 combustion ch ...

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 rpm (Upgraded to in 1994, and again to in 1995) * Maximum Torque - at 3,000 rpm (Upgraded to in 1994, and again to in 1995) 4G93

DOHC An overhead camshaft (OHC) engine is a piston engine where 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 combustion ch ...

16 Valve GDI * Gasoline Direct Injection (GDI) * Total Displacement - * Bore - * Stroke - * Compression Ratio - 12.0:1 * Maximum Output - ** Europe: at 5,250 rpm / at 5,500 rpm / at 5,500 rpm ** Japan: at 5,500 rpm / at 6,000 rpm / at 6,500 rpm * Maximum Torque - ** Europe: @ 3,500 rpm / @ 3,750 rpm ** Japan: @ 3,500 rpm / @ 3,750 rpm / @ 5,000 rpm 4G93

DOHC An overhead camshaft (OHC) engine is a piston engine where 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 combustion ch ...

16 Valve GDI Turbo * Gasoline Direct Injection (GDI) with turbocharger * Total Displacement - * Bore - * Stroke - * Compression Ratio - 10.0:1 * Maximum Output - @ 5,200 rpm / @ 5,500 rpm * Maximum Torque - @ 3,500 rpm / @ 3,500 rpm Applications * Mitsubishi Space Wagon *

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 Netherl ...

* Mitsubishi Carisma *

Mitsubishi Lancer The Mitsubishi Lancer is an automobile produced by the Japanese manufacturer Mitsubishi Motors since 1973. The Lancer has been marketed as the Colt Lancer, Dodge Colt, Plymouth Colt, Chrysler Valiant Lancer, Chrysler Lancer, Eagle Summit, ...

* Mitsubishi Libero *

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

* Mitsubishi FTO * 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 and subcompact cars in the 1960s, and then for the export version of the subcom ...

GTI *

Mitsubishi Galant The Mitsubishi Galant 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 ...

1996 * Mitsubishi Pajero iO / Pajero Pinin / Shogun Pinin / Montero iO / Pajero TR4 * Brilliance BC3 * Brilliance BS6 *

Brilliance BS4 The Brilliance BS4 is a four-door compact notchback A notchback is a design of a car with the rearmost section that is distinct from the passenger compartment and where the back of the passenger compartment is at an angle to the top of what i ...

*

Volvo S40 The Volvo S40 is a series of compact and subcompact executive automobiles marketed and produced by the Swedish manufacturer Volvo Cars from 1995 to 2012. The first generation (1995–2004) was introduced in 1995 with the S40 (S from saloon) ...

* Volvo V40

4G94

The 4G94 is a version built in Japan, used in the

Mitsubishi Lancer The Mitsubishi Lancer is an automobile produced by the Japanese manufacturer Mitsubishi Motors since 1973. The Lancer has been marketed as the Colt Lancer, Dodge Colt, Plymouth Colt, Chrysler Valiant Lancer, Chrysler Lancer, Eagle Summit, ...

. 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 an injector. This article focuses on fuel injection in reciprocating piston and Wankel rotary engines. All com ...

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 An overhead camshaft (OHC) engine is a piston engine where 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 combustion ch ...

16 Valve MPI *Multi-Point Injection (MPI) *Total Displacement - *Bore - *Stroke - *Compression Ratio - 9.5:1 *Maximum Output - @ 5,200 rpm *Maximum Torque - @ 4,250 rpm 4G94

DOHC An overhead camshaft (OHC) engine is a piston engine where 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 combustion ch ...

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 *

Mitsubishi Lancer The Mitsubishi Lancer is an automobile produced by the Japanese manufacturer Mitsubishi Motors since 1973. The Lancer has been marketed as the Colt Lancer, Dodge Colt, Plymouth Colt, Chrysler Valiant Lancer, Chrysler Lancer, Eagle Summit, ...

*

Mitsubishi Galant The Mitsubishi Galant 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 ...

* Hawtai Santa Fe

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