Sirius is the name of one of Mitsubishi Motors' four series of straight-4 automobile engines, along with Astron, Orion, and Saturn.
4G61
The 4G61 normally displaces 1.6 L, but there are two distinct variations: An earlier version uses 3.03x3.39 in bore and stroke, while a later one has moved to 3.24x2.95 in. This engine was always DOHC 16-valve and used either ECFI or MPFI fuel injection. A turbocharged version was also produced for the Mirage.
Applications:
4G62
The larger 1.8 L 4G62 was an SOHC 8-valve unit for longitudinal RWD/4WD use. With a 3.17x3.46 in bore and stroke, it displaces 1795 cc.
Applications:
- 1988 Mitsubishi Cordia
- 1988 Mitsubishi Tredia
4G63
The 4G63 was a 2.0 L (1997 cc) version. Again, there were two different bore and stroke versions, and both SOHC and DOHC were produced. It is found in various Mitsubishi models including the Eclipse and Galant but also appears in Chrysler-branded versions of the Eclipse: the Eagle Talon and Plymouth Laser.
Note that the 4G63 block in the Eclipse and Galant (and other Mitsubishi and Chrysler passenger cars) is not identical to the 4G63 block found in the Mitsubishi Mighty Max and Dodge Ram 50. The car-bound 4G63 has a bore and stroke of 3.35 in (85 mm) and 3.46 in (88 mm), whereas the truck 4G63 has a bore and stroke of 3.31 in (84 mm) and 3.54 in (90 mm).
Output for the US-spec 2004 Mitsubishi Lancer Evolution is 271 hp (202 kW) at 6500 RPM with 273 ft.lbf (370 Nm) of torque at 3500 RPM. It has a cast iron engine block and aluminum DOHC cylinder heads. It uses MPI multi-point fuel injection, has 4 valves per cylinder, is turbocharged and intercooled and features forged steel connecting rods.
In the United Kingdom, a special Lancer Evolution, the FQ-400, produces 302.13 kW (405.2 hp), from a 4G63 engine. At 202.9 hp (151.3 kW) per liter, it has possibly the highest specific output per liter of any production engine.
Racing
Its turbocharged variant, 4G63T (also sometimes referred to simply as the 4G63), has powered Mitsubishi vehicles in World Rally Championships for years in the Galant VR-4, Lancer Evolution, Carisma GT and Lancer WRC04. It was the powerplant of the Lancer Evolution when Tommi Mäkinen won his four sequential WRC championships. The engine is also used in a variety of turbocharged 2-liter models of Galant and Eclipse.
Applications:
4G64
The longitudinal 4G64 was the largest variant, at 2.4 L (2350 cc). Early models were 8-valve SOHC, but a later 16-valve DOHC version was also produced. All used MPFI with a 3.41 in (86.5 mm) bore and 3.94 in (100 mm) stroke.
A later 4G64, built in Shiga, Japan , was used as recently as 2004 in transverse applications. It has an cast iron engine block and aluminum SOHC cylinder heads. It uses SFI fuel injection, has 4 valves per cylinder with roller followers and features a one-piece cast camshaft cast and aluminum intake manifold.
The version used in the Chrysler Sebring/Stratus coupes produced 147 hp (110 kW) at 5500 RPM with 158 ft.lbf (214 Nm) of torque at 4000 RPM. The Chrysler version features fracture-split forged powder metal connecting rods.
The Lancer Ralliart/Eclipse version uses forged steel connecting rods. Output is 162 hp (121 kW) at 5500 RPM with 162 ft.lbf (260 Nm) of torque at 4000 RPM.
Applications:
4G67
The 16-valve DOHC 4G67 displaced 1.8 L (1836 cc).
Applications:
4G69
The 4G69 is a 2.4 L (2378 cc) version built in Shiga, Japan . Bore is 87 mm and stroke is 100 mm. Output is 160 hp (119 kW) at 5750 RPM with 162 ft.lbf (289 Nm) of torque at 4000 RPM. It has an cast iron engine block and aluminum SOHC cylinder heads. It uses MFI fuel injection, has 4 valves per cylinder with roller followers and features forged steel connecting rods, a one-piece cast camshaft, and a cast aluminum intake manifold.
Applications:
See also
