Orion

The Orion (or 4G1x) family of engines are inline 4 cylinder engines designed by Mitsubishi. All have cast iron cylinder blocks, alloy heads and overhead camshafts driven by a belt. The Orion series was first introduced in the Mitsubishi Colt in 1978. The Orion ranges from 1.2 to 1.6 Litres in capacity.

As with the Sirius family Hyundai also produced and used these engines. Hyundai's name for the family was Alpha.

4G11

The 4G11 is a 1.2 Litre engine displacing 1244cc. It uses a 69.5x82.0mm bore and stroke. It is available in SOHC, 2 valve per cylinder form.

The 4G11 was not widely used in Australia.

4G12

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.

4G13

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.

4G15

The 4G15 is tht 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.

4G18

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.

G4ED

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.

MITSUBISHI PETROL ENGINES
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
V6
6G7x	6G71 6G72 SOHC 12v 6G72 SOHC 24v 6G72 DOHC Early 6G74 Late 6G74 Ralliart 6G74 6G75
6A1x	6A10 6A11 6A12 6A13
6B3x	6B31
V8
8A80	8A80