The Hyundai-KIA G4JP engine is part of the Sirius engine series and was produced at Ulsan Plant between 1998 and 2006. This 2.0 liter inline four-cylinder engine was known for its reliability and efficiency, which made it popular for various Hyundai and KIA car models.
Main Features
| Characteristics | Value |
|---|---|
| Manufacturing | Ulsan Plant |
| Engine brand | Sirius |
| Years of production | 1998-2006 |
| Cylinder block material | Cast iron |
| Power system | Injector |
| Type | Ready |
| Number of cylinders | 4 |
| Valves per cylinder | 4 |
| Piston stroke, mm | 88 |
| Cylinder diameter, mm | 85 |
| Compression ratio | 10 |
| Engine displacement, cc | 1997 |
Power and Torque
The G4JP engine is available in several power options:
- 131 hp at 6,000 rpm
- 133 hp at 6000 rpm
- 136 hp at 5800 rpm
- 147 hp at 6000 rpm
The engine torque is:
- 176 Nm at 4600 rpm
- 177 Nm at 4500 rpm
- 180 Nm at 4600 rpm
- 194 Nm at 4500 rpm
Oil system
- Oil consumption, gr./1000 km: up to 1000
- Engine oil: 0W-40, 5W-30, 5W-40, 5W-50, 10W-30, 10W-40, 10W-50, 10W-60, 15W-50
- Oil volume in the engine, liters: 4.0
- Interval of oil change, km: 7000-10000
Tuning
The G4JP engine has the potential to be tuned to 200+ hp and beyond, making it attractive to tuning enthusiasts.
Application
The G4JP engine has been installed in a wide range of Hyundai and KIA models, including:
- Hyundai Santa Fe
- Hyundai Sonata
- KIA Optima
- Hyundai Trajet
Reliability and repair of the G4JP engine
In 1998, Hyundai company updated its 2.0-liter G4CP, which is part of the Sirius series, the new engine was designated G4JP and it is a more recent series Sirius 2. But all these designations do not confuse us, we know that G4JP is produced under license Mitsubishi 4G63 7 bolts. Next, let’s consider interesting features and differences of this motor from the past G4CP.
Here is almost the same cylinder block with balancer shafts, but inside it is a slightly modified crankshaft, while the stroke of the piston has not changed – the same 88 mm, connecting rods have become thinner and lighter, pistons also became a little lighter and are distinguished by the bottom with 4 counterbores for valves, piston pins are now 22 mm (were 21 mm).
On top of the block is a 16-valve DOHC head, which differs from the G4CP-D in ports, camshafts and mounting bolts. It also has its own intake and exhaust manifolds, thermostat, pump, oil pump, electronics and sensors. The motors are noticeably different from each other.
Shafts rotate by means of the timing belt, which serves about 60 thousand kilometers, then the replacement otherwise breaks and bends all the valves. Also here are installed hydrocompensators, which noticeably simplifies life, because you isolate yourself from the need to adjust the valves from time to time.
This is not the only motor in the Hyundai Sirius II series, it also included the following variants: 1.8 ะป. G4JN and the 2.4-liter G4JS.
This motor was dropped from the Hyundai model lineup in 2006, and its place was taken by the G4GC from the Beta family.
Problems and shortcomings of G4JP engines
Structurally, the 2.0-liter G4JP motor and the 2.4-liter G4JS are quite similar, so they have almost the same problems. Let’s list some of the main problems, frequent breakdowns and disadvantages of the 2.0-liter Hyundai/Kia G4JP Korean engine:
- The engine is sensitive to poor oil quality. Because of bad engine oil can jam the bearings of the balancer shafts, and this leads to the breakage of the timing belt, resulting in bent valves.
- The same suffer hydrocompensators valve clearances. Often hydricks begin to knock already at 50 000 km of mileage.
- On mileage over 150-200,000 km, piston rings often lie down and oil build-up appears. Also owners begin to complain about oil leaks from various gaskets and oil seals.
- The timing belt does not have a long life, and its breakage leads to serious negative consequences, up to the replacement of the cylinder-head.
- Often owners are concerned about strong vibrations. As a rule, the reason is the wear of balancing shafts.
Hyundai G4JP engine tuning
Atmo
If you want to slightly change the character of your engine and get the effect of additional power, then spider 4-2-1 + straight-through exhaust with ECU firmware at your service. With this you will get 5-7 hp on top! If such a boost does not excite the mind, then you can add camshafts 264 or even 272 and be sure to customize the ECU. This will give another 10-15 hp. You can continue to mock the atmosfernik and make porting of the cylinder head, put a 4-throttle intake and raise the compression ratio, but all this is money in the wind.
Turbo
Unfortunately, it is quite difficult to build a Korean 4G63 turbo with little blood due to some differences between G4JP and 4G63T:
- pistons
- rods
- root liners
- oil pump
- oil pan
- oil cooler
- the entire intake
- turbine with manifold
- intercooler and all piping
- fuel system
- electronics and ECU
All this can be taken from Evolution, except for the turbo manifold (it may not fit), but it is much easier to put a contract Evo engine. If you decide to turbocharge, then to the list above it is desirable to immediately add a full 76 mm exhaust, gasoline pump Walbro 255 and injectors 750 ss. With a good tune your Hyundai will show 400 hp on the Evo turbo TD05.
Next, you can put in a larger turbo, saw the cylinder head, increase displacement… do anything just like you would with a regular Lancer Evo.
MOTOR RATING: 4+