Mitsubishi 4G1 engine
| 4G1 | |
|---|---|
 |
|
| Overview | |
| Manufacturer | Mitsubishi Motors |
| Also called | Orion |
| Production | 1970s–present |
| Combustion chamber | |
| Cylinder block alloy | Cast iron |
The Mitsubishi Orion or 4G1 engine is series of inline-four internal combustion engines introduced by Mitsubishi Motors in the 1970s, along with the Astron, Sirius, and Saturn. It was first introduced in the Colt and Colt-derived models in 1978. Displacement ranges from 1.2 L to 1.6 L.
The 4G11 displaces 1.2 L (1244 cc) with a bore and stroke of 69.5 mm x 82.0 mm.
Applications:
The 4G12 (also known as the G11B) displaces 1.4 L (1410 cc) with a bore and stroke of 74.0 mm x 82.0 mm. 4G12 was the first to feature Mitsubishi's MD (modulated displacement) technology, a form of variable displacement. The 4G12 was not offered by Mitsubishi with fuel injection. This engine is fairly outdated compared to its counterparts that were used in the later Lancers.
Applications:
Turbocharged version of the 4G12, uses a TC06 turbocharger.
The SOHC 4G13 displaces 1.3 L 12 valves (1298 cc) (73 hp) with a bore and stroke of 71.0 mm x 82.0 mm. In the Gulf Countries, 90 PS gross at 6000 rpm is claimed.
Applications:
The SOHC 4G15 displaces 1.5 L (1,468 cc) with a bore and stroke of 75.5 mm x 82.0mm. A version of the 4G15 was produced with gasoline multi port injection. It has approximately 92 hp (69 kW) on the 1993 Mirage model. The DOHC 4G15 produces 110 hp with 137 Nm of torque. Another DOHC version was combined with GDI fuel injection and delivers100 hp and 137Nm of torque. There is also a DOHC 16 valve variant 110ps at 6,000rpm which is uncommon. A DOHC MIVEC turbo variant of the engine is also still in production to date (4G15T), serving in the Mitsubishi Colt series, offering 163 hp (122 kW) on the latest Colt Version-R (with exhaust enhancement). The most powerful version yet of this engine is found in the Colt CZT Ralliart (special model from Switzerland) with a total output of 197 hp. The 4g15 is known as one of the longest lived Japanese engines ever produced. There was a recorded instance of the engine exceeding 997,000 miles (1,604,515.97 km) in a 1998 Mitsubishi Mirage sedan.
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