Hyundai KIA 2.4L Engine (Theta MFI/GDI) Specs, Problems, Reliability. The Hyundai 2.4 L engine (G4KC, G4KE, G4KG, G4KJ) comes from the Theta/Theta II engine family. It is a 2.4-liter four-cylinder gasoline engine with direct or multi-point injection depends upon the generation and in which vehicle it is utilized. Like other engines, Hyundai shares this power system with KIA brand. The 2.4 L is really similar to the 2.0 L version of the exact same Theta series, with small distinctions due to the increased engine displacement and internal loads.
The engine has aluminum open-deck cylinder block and aluminum cylinder head. The increased displacement was accomplished by setting up a new crankshaft with 97 mm stroke (two-liter engine has 86 mm stroke). The cylinder bore is also larger. In this case, the engine got new pistons with a diameter of 88 mm (instead of 86 mm pistons). The cylinder head has 4 valves per cylinder (16 valves total) and double overhead camshafts (DOHC). The crankshaft drives the intake and exhaust camshafts by using a timing chain.
The first Theta engines utilize the constantly variable valve timing (CVVT) for consumption timing only. The later generation, Theta II engine, is equipped with the variable valve timing system CVVT on both camshafts. There are not hydraulic lifters/tappets in the valvetrain of the 2.4 l engine; it utilizes shimless pail lifters (clearance modification is required about every 60k miles).
Most of Hyundai’s and KIA’s 2.4 engines are equipped with multi-point fuel injection (MFI or MPI). The newest engines, called as 2.4 GDI, have direct injection. That means the fuel is injected straight into each cylinder by unique multi-hole direct injectors. The Hyundai 2.4 GDI engines have a high-pressure fuel pump installed on top of the cylinder, which is activated through an additional 4-lobe camera on the exhaust camshaft.
The Hyundai Theta series took the start as the outcome of the World Engine program, that is why the 2.4 l engine is quite similar to Mitsubishi’s 4B12 engine, which, by the way, used not only by Mitsubishi but likewise in Peugeot and Citroen cars.
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Hyundai-KIA 2.4 L (GDI/MPI) Engine Problems and Reliability
Engine problems are the same as two-liter engine has. There are different noises, noises, knocks. You can find out more info in the Theta 2.0 L engine review.
you must see more engine detail in here: Engine – US Cars News or you can see on wiki here
Hyundai KIA 2.4L Engine (Theta MFI/GDI) Specs
| Manufacturer | Hyundai Motor Manufacturing Alabama |
| Production years | 2004-present day |
| Cylinder block material | Aluminum |
| Cylinder head material | Aluminum |
| Fuel type | Gasoline |
| Fuel system | Multi-point fuel injection; Direct fuel injection |
| Configuration | Inline |
| Number of cylinders | 4 |
| Valves per cylinder | 4 |
| Valvetrain layout | DOHC |
| Bore, mm | 88.0 mm (3.46 in) |
| Stroke, mm | 97.0 mm (3.82 in) |
| Displacement, cc | 2,359 cc (144 cu in) |
| Type of internal combustion engine | Four-stroke, naturally aspirated |
| Compression Ratio | 10.5:1 11.3:1 |
| Power, hp | 162-201 hp (121-150 kW)/5,800-6,300 |
| Torque, lb ft | 164-184 lb-ft (220-250 Nm)/4,000-4,250 |
| Engine weight | – |
| Firing order | 1-3-4-2 |
| Engine oil weight | 5W-30 |
| Engine oil capacity, liter | 4.6 l |
| Oil change interval, mile | 9,000 (15,000 km)/12 months |
| Applications | Hyundai Sonata, Hyundai Tucson, Hyundai Santa Fe, Hyundai Starex, Hyundai Grandeur, Hyundai ix35, Kia Optima, Kia Rondo, Kia Cadenza GDI, Kia Sportage, Kia Sorento, Kia Forte, KIA Carens, KIA Magentis |
Hyundai KIA 2.4L Engine (Theta MFI/GDI) Modifications
- G4KC – 162 hp (121 kW) at 5,800 rpm, 164 lb-ft (220 Nm) at 4,250 rpm. The engine belongs to the very first Theta generation. It has 10.5:1 compression ratio. The G4KC engine was used in the Hyundai Sonata NF, KIA Carens, and KIA Magentis.
- G4KE – 175 hp (131 kW) at 6,000 rpm, 168 lb-ft (228 Nm) at 4,000 rpm. The G4KE is a 2.4 L MFI Theta II engine with double CVVT system and 10.5:1 compression ratio. Application: Hyundai ix35, Hyundai Splendour, Hyundai Sonata, Hyundai Santa Fe, KIA Specialty, KIA Magentis, KIA Sorento, and KIA Sportage.
- G4KG – this version is identical to the G4KE engine. The G4KG is offered in the KIA Carens available in the U.S.A. and Canada.
- G4KJ – 201 hp (150 kW) at 6,300 rpm, 184 lb-ft (250 Nm) at 4,200 rpm. The G4KJ engine is a 2.4 l GDI engine of the Theta II series with direct fuel injection and 11.3:1 compression ratio. Application: Hyundai ix35, Hyundai Grandeur, Hyundai Sonata, KIA Sportage, and KIA Optima.
