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Chrysler 2.4L Tigershark MultiAir Engine Review

2.4L Tigershark MultiAir Engine

The 2.4L Tigershark (Jeep ED6) is a 2.4-liter inline four-cylinder NA gasoline engine debuted in 2013 Dodge Dart. The Tigershark/MultiAir II engine series was developed by Chrysler and Fiat engineers in a partnership. Although the new family is based on previous "World Gas Engine", the new 2.4-liter version has almost 90% new or redeveloped components improving the fuel economy and performance. The new engine became available for Jeep Cherokee, Renegade, Compass, Ram ProMaster City, and also is used in Fiat models such as Fiat 500X and Fiat Toro.

The 2.4 Tigershark has a high-pressure, die-cast aluminum cylinder block with dry, cast-iron liners. For extra rigidity, there is a lightweight, aluminum ladder frame between the engine block and the steel sandwich-type design oil pan. Engineers added rotating balance shafts into the bottom of the 2.4L block to offset vibration. The engine bottom also includes a forged, steel crankshaft, powder-forged steel connecting rods, and lightweight aluminum pistons with polymer-coated piston skirts. Piston pins are full floating with hard carbon (diamond-like) coatings. This engine is equipped with oil squirters that spray oil on the bottom of the pistons for reducing temperature.

On top of the block, there is an aluminum 16-valve cylinder head with a single, chain-driven camshaft and the electro-hydraulic MultiAir II system developed by Fiat. The MultiAir is variable valve timing and lift technology controlled by electro-hydraulic valve actuators. The 2.4 Tigershark is equipped with a MultiAir II system that controls both the opening and the closing point for the intake valve event. The exhaust valves are actuated by the camshaft through polished shimless mechanical buckets. On the intake side, each cylinder has the intake cam lobe, which acts on a roller finger follower. A finger follower actuates a piston which has a lash adjuster and a hydraulic brake. This piston pushes oil through a solenoid into the valve assembly. When the solenoid is open, the valve disconnected from the cam and shuts under the pressure applied by the valve spring. When the solenoid is closed, the valves follow a cam profile as in a traditional engine. This is how the MultiAir system controls valve timing and valve lift and optimizes the engine for both fuel economy and performance. The cylinder head is covered by an aluminum headcover.

The engine uses a traditional multiport fuel injection system and coil-on-plug ignition with dual precious-metal spark plugs. The intake manifold made of plastic, and it's covered by an acoustic cover to reduce noise. The Tigershark is equipped with a two-stage oil-pressure relief system, which maintains an optimal oil pressure and reduces engine-oil pumping loads at the same time.

Engine Specs

Manufacturer
Chrysler Plant in Dundee, Saltillo (Mexico); Trenton, Michigan (USA)
Production years
2012-present
Cylinder block material
Aluminum
Cylinder head material
Aluminum
Fuel type
Gasoline
Fuel system
Multi-point fuel injection
Configuration
Inline
Number of cylinders
4
Valves per cylinder
4
Valvetrain layout
SOHC
Bore, mm
88.0 mm (3.46 in)
Stroke, mm
97.0 mm (3.82 in)
Displacement, cc
2,360 cc (144 cu in)
Type of internal combustion engine
Four-stroke, naturally aspirated
Compression Ratio
10.1:1
Power, hp
178-184 hp (133-137 kW)/6,250-6,400
Torque, lb ft
171-179 ft-lb (232-243 Nm)/3,800-4,800
Engine weight
-
Firing order
1-3-4-2
Engine oil weight
SAE 0W-20
Engine oil capacity, liter
5.2 l (5.5 qt) with oil filter
Oil change interval, mile
10,000 (15,000 km) / 12 months
Applications
Chrysler 200, Dodge Dart, Jeep Cherokee, Jeep Renegade, Jeep Compass, Ram ProMaster City, Fiat 500X, Fiat Toro

2.4L Tigershark MultiAir (ED6) Problems and Reliability

As was mention above, the MultiAir system operates using engine oil. In this case, an oil viscosity, quality, and its condition are very important aspects for the 2.4 Tigrshark reliability. So far, the main problem for this engine is, yes, oil consumption. More pronounced oil consumption happens with short runs, but it is not always the major factor. The engine has some issues with piston rings that allegedly don't work properly with the cylinders. By the way, FCA dealerships tell this explanation for their customers about what is related to oil consumption problems.

One more weak point is the MultiAir system. Dirty oil can plug its oil channels and solenoids, and this system will fail. Fixing MultiAir is quite an expensive job due to complex design with numerous small parts and a long disassembling/assembling process.

Otherwise, the engine does not raise questions. Perhaps it is a bit noisy, but of course, it does not affect the durability or longevity. Keep an eye on oil level, change it even more frequently than the manual says, and the 2.4-liter Tigershark will serve 150-200k miles.

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