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Orion (4G1x)
Manufacturer Mitsubishi Motors
Also called Alpha (Hyundai nomenclature)
Production 1977 - present
Configuration Inline 4
Cylinder block alloy Cast Iron
Cylinder head alloy Aluminum alloy
Valvetrain SOHC/DOHC
Predecessor Neptune (4G4x)
Successor 4A9x

The Orion (or 4G1x) family of engines are inline 4 cylinder engines which were designed by Mitsubishi to replace their Neptune (4G4x) series. All have cast iron cylinder blocks, alloy heads and overhead camshafts driven by a belt. Displacement ranges from 1.2 to 1.6 Litres.

The Orion series was first introduced in the Mitsubishi Colt in 1977 and production continues today earning it the distinction of being one of the longest lived Japanese engines ever produced. The engine has seen duty in a range of other makes including Hyundai (who call it the Alpha), Proton, Smart, Haval and Geely.


The 4G11 (or G11B as it is sometimes known) is a 1.2 Litre engine displacing 1244cc. It uses a 69.5x82.0mm bore and stroke and has a single overhead camshaft with two valves per cylinder. Power was claimed to be 53 kW when fitted to the first generation Mirage.

The 4G11 was not widely used in Australia but saw international service in the first generation Mirage and first and second generation Lancer.


The 4G12 is a 1.4 Litre engine displacing 1410cc. It has a 74.0x82.0mm bore and stroke. The 4G12 was only available in SOHC, 2 valve per cylinder form.

In Australia the 4G12 can be found in the RA Colt.

4G12 Modulated Displacement

In 1982, Mitsubishi developed what has been hailed as the world's first engine with cylinder deactivation technology with the 4G12 Modulated Displacement (MD). Contrary to popular belief however, Mitsubishi was the second car maker to bring the technology to market with Cadillac's L62 being released to the market for a year in 1981.

Mitsubishi's MD deactivated cylinders 1 and 4 under light load conditions in an effort to reduce fuel consumption. It achieved this by use of an Electronic Control Unit which detects whether the engine needs to be in 2 or 4 cylinder mode, an oil pump, an oil control valve which contains a three port solenoid to control deactivation devices on the valves of cylinders 1 and 4.


The 4G13 is a 1.3 Litre engine with a displacement of 1298cc. It has a 71.0x82.0 bore and stoke with a 9.5:1 compression ratio. The 4G13 was built in SOHC 3 valve per cylinder form. 2 valves were used for inlet, with one for exhaust. The same engine was also used in some Hyundai's and called G4EH.

In Australia this engine was used in the Proton Wira.


Carbureted 4G15 in a Proton Saga

The 4G15 is the most common of all the Orion engines. It is a 1.5 Litre engine with a displacement of 1468cc. Its bore and stroke is 75.5x82.0mm and is avaiable in SOHC 2 valve per cylinder, SOHC 3 valve per cylinder, DOHC 3 valve per cylinder and DOHC 4 valve per cylinder forms. SOHC versions use a 9.2:1 compression ratio, while the DOHC versions use a 9.5:1 compression ratio.

The DOHC 16v version was also fitted with MIVEC and/or a turbocharger in some markets.

This engine was also used by Hyundai, the SOHC 8v version being labelled either G4AJ or G4DJ; the SOHC 12v version being called G4EK; the DOHC 12v version being called G4FK; and the DOHC 16v being designated G4EC.

4G15 SOHC 8v

In Australia,, the 8 valve SOHC 4G15 was fitted to the Mitsubishi CA Lancer, Hyundai Excel X1 and X2.

4G15 SOHC 12v

In Australia, the 12 valve SOHC 4G15 was fitted to the Mitsubishi Lancer CB,CC,CE, Mitsubishi Mirage CC,CE, Hyundai Excel X3, Hyundai S Coupe and Proton Satria, Persona, Wira and Jumbuck. A turbocharged version was also built by Hyundai for use in the S Coupe.

4G15 DOHC 12v

In Australia, the 12 valve DOHC 4G15 was fitted to the Hyundai Excel X3.

4G15 DOHC 16v

In Australia, the 16 valve DOHC 4G15 was used in the Hyundai Accent and Kia Rio.


In Australia the 16 valve DOHC 4G15 was used in the Mitsubishi Colt RG in 2004 and 2005where it produced 72kW @ 6,000 rpm and 132Nm @ 4,250 rpm.

4G15 DOHC 16v MIVEC Turbo

In Australia the 16 valve DOHC Turbo 4G15 was used in the Mitsubishi Colt RG Ralliart where it produced 113kW @ 6,000 rpm and 210Nm @ 3,500 rpm and the Colt RZ Cabriolet Turbo where it output the same torque but 3kW less power.


The 4G17 is a 1.3 Litre engine with SOHC and 3 valves per cylinder (two intake, one exhaust). It displaces 1343cc and uses a 72.2mm x 82mm bore and stroke.


The 4G18 is the largest member of the Orion family produced by Mitsubishi. It isa 1.6 Litre engine. It has a displacement of 1584cc and uses a 76.0x87.3mm bore and stoke. It is produced solely in SOHC 16 valve (4 per cylinder form).

In Australia the 4G18 was used in the Proton Waja.


4G19 as used in a 2003 Mitsubishi Colt

Mitsubishi introduced the 4G19 in 2002 to power the seventh generation Colt (in markets other than Australia). The 1.3 Litre engine featured DOHC with 4 valves per cylinder and MIVEC. It outputs 66 kW at 5600 rpm and 121 Nm at 4250 rpm.

The 4G19 displaces 1343cc and uses a 75.5mm x 75mm bore and stroke.


The G4ED is a variation of the 4G15 DOHC 16v by Hyundai and was never produced by Mitsubishi. Hyundai bored and stroked the 4G15 to produce a 1.6 Litre engine with a 1599cc displacement. It uses a 76.5x87.0mm bore and stroke and is produced solely in DOHC 16 valve form.

In Australia the G4ED was used in the late model Hyundai Accent.

3 cylinder
3A9x 3A90 3A91 3A92
4 cylinder
Neptune 4G41 4G42
Orion 4G11 4G12 4G13 4G15 4G17 4G18 4G19 G4ED
Sirius 4G61 4G62 4G63 4G64 4G67 4G69
Astron 4G51 4G52 4G53 4G54
Astron II Original Revised
Saturn 4G30 4G31 4G32 4G33 4G37
4G9x 4G91 4G92 4G93 4G94
4A9x 4A90 4A91 4A92
4B1x 4B10 4B11 4B11T 4B12
Inline 6
Saturn 6 6G34
6G7x 6G71 6G72 SOHC 12v 6G72 SOHC 24v 6G72 DOHC Early 6G74 Late 6G74 Ralliart 6G74 6G75
6A1x 6A10 6A11 6A12 6A13
6B3x 6B31
8A80 8A80