Mitsubishi 4G64 2.4 engine

Features of the 4G64 engine

Shenyang Aerospace Mitsubishi Motors Engine Manufacturing Co Ltd, an engine manufacturing plant in Shenyang established in cooperation with Mitsubishi Motors, introduces Sirius series engines. These engines have been produced since 1983 and are still in production today.

Features of the Sirius engine include the use of cast iron for the cylinder block, an injector fuel system and in-line four cylinders. Cylinder diameter is 86.5 mm, piston stroke is 100 mm. The compression ratio varies from 8.5 to 11.5.

The displacement of the Sirius engine is 2,351 cubic centimeters. Engine output ranges from 112 to 150 horsepower depending on the model and RPM. Engine torque ranges from 184 to 225 Nm at different engine speeds.

These engines run on 95 octane fuel and meet environmental regulations up to Euro-5 level. The weight of the engine is around 185 kg.

The average fuel consumption of the Sirius engine is 10.2 liters per 100 km in the city, 7.6 liters per 100 km on the highway and 8.8 liters per 100 km in the combined cycle. Oil consumption can reach 1000 grams per 1000 kilometers.

To ensure engine operation, different types of oil are used: 0W-40, 5W-30, 5W-40, 5W-50, 10W-30, 10W-40, 10W-50, 10W-60 and 15W-50 with a volume of 4.0 liters. It is recommended to change the oil every 7000-10000 km.

The mileage of the Sirius engine, according to the factory, is more than 400 thousand kilometers, and the tuning potential can reach more than 300 horsepower without loss of resource.

Sirius engines were installed on such cars as Mitsubishi Eclipse, Mitsubishi Galant, Mitsubishi Outlander, Mitsubishi Montero/Pajero, Mitsubishi RVR/Space Runner, Hyundai Sonata, Kia Sorento, Mitsubishi Chariot/Space Wagon, Mitsubishi Delica, Mitsubishi L200/Triton, Mitsubishi Magna, Mitsubishi Sapporo, Mitsubishi Starion, Mitsubishi Tredia, Mitsubishi Zinger, Brilliance BS6, Chery V5, Chrysler Sebring, Dodge Colt Vista/Eagle Vista Wagon, Dodge Ram 50, Dodge Stratus, Great Wall Hover and Hyundai Grandeur.

Mitsubishi’s 4G64 2.4 engine reliability, problems and repairs

The 4G64 2.4 engine was introduced in 2000 as a development of the two-liter 4G63 engine and replaced the 4G54 engine. This powertrain has a displacement of 2.4 liters and is part of a family that also includes the 4G63T, 4G61, 4G62, 4G63, 4G63, 4G63, 4G67, 4G69, 4D65 and 4D68. The cast-iron cylinder block height has increased from 229 mm to 235 mm, crankshaft stroke is 100 mm (up from 88 mm), and cylinder bore has increased from 85 mm to 86.5 mm. The connecting rods are 150mm long and the compression height of the pistons is 35mm.

The original cylinder head was an 8-valve, single-shaft cylinder head, and the compression ratio was 8.5. Power output of the 4G64 SOHC 8V version was 112 hp at 5000 rpm and 183 Nm of torque at 3500 rpm. Later, a 16-valve cylinder head with a single camshaft (SOHC 16V) was fitted, increasing the compression ratio to 9.5. Power ranged from 128 to 145 hp at 5,500 rpm and torque from 192 to 206 Nm at 2,750 rpm.

Further development led to the addition of another camshaft, which turned the MKP into a 16V DOHC. The compression ratio went up to 9 and power increased to 150-156 hp at 5,000 rpm and 214-221 Nm of torque at 4,000 rpm. There is also a direct injection GDI version equipped with SOHC 16V GTB, with a compression ratio of 11.5 and output of 150 hp at 5,500 rpm and 225 Nm of torque at 3,500 rpm. This variant was fitted to the Mitsubishi Galant, Space Wagon, Space Gear, Space Runner.

All 4G64 cylinder heads are equipped with hydrocompensators, which do not require valve adjustment. The diameter of the intake valves is 33 mm and the exhaust valves are 29 mm. The timing is driven by a belt, which must be changed every 90 thousand kilometers.

Production of 4G64 continues to this day, mainly for Chinese cars, and since 2003 its improved version called 4G69 is produced.

This engine also has twin relatives on the Korean peninsula – G4JS and G4CS.

Mitsubishi 4G64 engine problems and disadvantages

Problems and disadvantages of the 4G64 engine are the same as those of the 2.0-liter engine. Most serious breakdowns are caused by poor quality or expired engine oil. Due to lack of oil, balancer shafts can jam with subsequent belt breakage, pieces can get under the timing belt and as a consequence – slippage or breakage of the timing belt, bend valves.

Often owners complain about the low resource of hydrocompensators. Again, according to reviews, if you pour into the engine what you get, cheap oil, the hydrocompensators will die before 50,000 kilometers of mileage. There is also a problem of rapid failure of the engine cushions, because of which there is a strong vibration. Most often the left cushion is the first to fail. Otherwise, as with all aging engines, the number of minor faults increases: sensor failure, oil and antifreeze leaks, throttle sticking, etc.

Mitsubishi 4G64 engine tuning

DOHC+Distributors

To increase the power of a non-turbocharged 4G64 engine, we will have to remove the single-shaft cylinder head and buy a Hyundai Sonata 4th generation cylinder head (G4JS engine) along with the intake manifold, refine it, remove roughness, align the channels. You also need to buy an Evo throttle body, cold intake, ARP bolts, forged pistons to increase compression ratio (~11-11. 5, such as Wiseco), Eagle connecting rods, remove balancer shafts, buy 272/272 camshafts with split gears and hardened springs, fuel rail from Galant, 440-450cc injectors, Walbro 255 pump, 4-2-1 exhaust manifold (can be 4-1), 2.5″ exhaust, additional stuff and re-flashing. With all of these components, the 4G64 engine will increase to 200+ hp.

Turbo

To increase power, the above improvements will not be enough and the engine needs to be supercharged. The easiest way to do this is to purchase a Lancer Evolution cylinder head complete with a turbocharger, intercooler, supercharger, manifold, and exhaust system that must be customized for your specific car. In addition, you will need to upgrade the oil delivery system to the turbocharger, install ARP studs, turbo camshafts with split gears and reinforced valve springs, forged pistons (with compression ratios around 8.5-9), Eagle connecting rods, remove the balancer shafts, install Evo injectors of 560cc or better, and purchase a Walbro 255 pump. After tuning such a system, you can expect over 400 hp.

You should also replace the crankshaft with an 88mm or softer Evo version, install 156mm connecting rods (titanium for high power) and bore the cylinders to 87mm. The result is a 2.1-liter engine and very high revs. At this base level, you can install a Garrett GT42 turbocharger with the appropriate hardware and expect reasonably high straight-line speed.

Engine Rating: 4+.