Hyundai Theta engine
 Theta engine |
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| Overview | |
| Manufacturer | Hyundai Motor Company |
| Combustion chamber | |
| Configuration | Straight 4 |
| Displacement | 2.0L (1998 cc) 2.4L (2395 cc) |
| Cylinder bore | 86 mm (2.0L) 88 mm (2.4L) |
| Piston stroke | 86 mm (2.0L) 97 mm (2.4L) |
| Cylinder block alloy | Aluminium |
| Cylinder head alloy | Aluminium |
| Valvetrain | DOHC |
| Compression ratio | 10.5:1 (2.0L) 10.3:1 (2.4L) |
| Combustion | |
| Fuel system |
MPI GDI |
| Management | EMS-II from Siemens VDO |
| Fuel type | Unleaded gasoline |
| Oil system | Pressure feed |
| Cooling system | Watercooled |
| Output | |
| Power output | 107 kW @ 6000 rpm (2.0L) 121 kW @ 5800 rpm (2.4L) |
| Torque output | 190 Nm @ 4000 rpm (2.0L) 222 Nm @ 4250 rpm (2.4L) |
| Dimensions | |
| Dry weight | 134 kg (2.0L) |
The Hyundai Theta (G4KC) is a gasoline 4-cylinder automobile engine family. The third all-aluminum engine of Hyundai Motor Company debuted in the fourth-generation Hyundai Sonata sedan (codenamed NF), which was unveiled in August 2004 in South Korea. Hyundai Motor Manufacturing Alabama (HMMA) built a Theta II engine shop on the grounds of their Montgomery, Alabama automobile factory. The shop builds only the Theta II engine for both the Hyundai plant and the new Kia Plant in West Point, GA. It was completed in August 2008.
The Global Engine Alliance was a joint venture between Chrysler, Mitsubishi Motors, and the Hyundai Motor Company for developing a line of shared 4-cylinder engines. The initial design of the engine block and cylinder head was handled by Hyundai. However, each manufacturer configured their variants of the initial design differently based on their needs. In 2009, Chrysler bought out Mitsubishi and Hyundai's stake in the joint-venture; however, each company retained rights to build the engines.
The first version of the Theta Engine had two variants, the 2.0L and the 2.4L.
2.0L - G4KA
The 2.0L version is an Inline 4-cylinder engine that carries a bore and stroke of 86 mm and a 10.5:1 compression ratio; the engine makes 143 hp (107 kW; 145 PS) at 6,000 rpm and 140 lb·ft (190 N·m) of torque at 4,000 rpm. It uses a timing chain instead of belt, and the engine dry weight is 134 kg (295 lb).
2.4L - G4KC
The 2.4L version is an inline 4-cylinder engine that carries a bore of 88.0 mm, stroke of 97.0 mm and a 10.3:1 compression ratio; the engine makes 162 hp (121 kW; 164 PS) at 5,800 rpm and 164 lb·ft (222 N·m) of torque at 4,250 rpm.
2.0L - G4KD
It features hollow stainless-steel DOHC with powder-metal cam lobes, pent-roof combustion chambers and shimless bucket tappets in the cylinder head.
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Wikipedia