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. 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.
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.
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.
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.
4G19Colt (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×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.
|MITSUBISHI PETROL ENGINES|
|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|
|6G7x||6G71 6G72 SOHC 12v 6G72 SOHC 24v 6G72 DOHC Early 6G74 Late 6G74 Ralliart 6G74 6G75|
|6A1x||6A10 6A11 6A12 6A13|