The 2.4L Tigershark (Jeep ED6), a 2.4-liter inline four-cylinder NA gasoline engine, debuted in the 2013 Dodge Dart. The Tigershark/MultiAir II engine family was developed in collaboration with Chrysler and Fiat engineers.
Despite the fact that the new family is based on the previous "World Gas Engine," the 2.4-liter version has about 90% new or refurbished components, resulting in enhanced fuel economy and performance. Jeep Cherokee, Renegade, Compass, and Ram ProMaster City, as well as Fiat 500X and Toro cars, now have the new engine.
The cylinder block of the 2.4 Tigershark is composed of high-pressure die-cast aluminium and has dry cast-iron liners. A lightweight aluminium ladder structure is installed between the engine block and the sandwich-type steel oil pan for added robustness. Engineers added spinning balance shafts at the bottom of the 2.4L block to decrease vibration.
The engine's bottom rotating components include a forged steel crankshaft, powder-forged steel connecting rods, and lightweight aluminium pistons with polymer-coated piston skirts. Piston pins are totally floating and feature robust carbon (diamond-like) coatings. Oil squirters spray oil on the bottom of the pistons to reduce the temperature in this engine.
On top of the block is a 16-valve aluminium cylinder head with a single chain-driven camshaft and Fiat's electro-hydraulic MultiAir II system. The MultiAir's variable valve timing and lift technology is controlled by electro-hydraulic valve actuators. On the 2.4 Tigershark, the MultiAir II system regulates both the opening and closing positions of the intake valve motion. The exhaust valves are controlled by the camshaft using polished shimless mechanical buckets.
On the intake side, each cylinder has its own intake cam lobe. Those lobes have an impact on roller-finger followers. Each finger follower operates a piston with a lash adjustment and a hydraulic brake. Through a solenoid, this piston draws oil into the valve assembly. The valve separates from the cam and shuts under the pressure of the valve spring when the solenoid is switched on.
When the solenoid is closed, the valves follow the cam profile of a standard engine. The MultiAir system manages valve lift and timing in this manner. Thanks to the MultiAir technology, the 2.4 Tigershark is ideally tuned for both fuel economy and performance. The cylinder head is protected by an aluminium headcover.
The engine is equipped with a standard multiport fuel injection system and two precious-metal spark plugs that use coil-on-plug ignition. The intake manifold is made of plastic and has an acoustic cover to keep noise out. A two-stage oil-pressure relief system on the Tigershark maintains oil pressure at optimal levels while decreasing engine oil pumping needs.
Manufacturer: Chrysler Plant in Dundee, Saltillo (Mexico); Trenton, Michigan (USA)
Production years: 2012-present
Cylinder block material: Aluminium
Cylinder head material: Aluminium
Fuel type: Gasoline
Fuel system: Multi-point fuel injection
Number of cylinders: 4
Valves per cylinder: 4
Valvetrain layout: SOHC
Bore: 88.0 mm (3.46 in)
Stroke: 97.0 mm (3.82 in)
Displacement: 2,360 cc (144 cu in)
Type: Four-stroke, naturally aspirated
Compression Ratio: 10.1:1
Power: 178-184 hp (133-137 kW) at 6,250-6,400 rpm
Torque: 171-179 ft-lb (232-243 Nm) at 3,800-4,800 rpm
Firing order: 1-3-4-2
Engine oil weight: SAE 0W-20
Engine oil capacity: 5.2 litres (5.5 qt) with oil filter
Oil change interval: 10,000 miles (15,000 km) / 12 months
Applications: Chrysler 200, Dodge Dart, Jeep Cherokee, Jeep Renegade, Jeep Compass, Ram ProMaster City, Fiat 500X, Fiat Toro
Reliability & Issues
The MultiAir system is powered by engine oil. In this case, oil viscosity/quality and condition are front-page problems for the 2.4 Tigershark's reliability. So far, the engine's main problem has been excessive oil consumption.
Shorter runs result in greater oil usage, however this isn't always the case. This 2.4L engine's piston rings are allegedly not operating correctly with the cylinders. By the way, FCA dealerships give this explanation to their customers about oil use difficulties.
Another problem is the MultiAir system. If unclean oil clogs the oil tubes and solenoids, the system will fail. Repairing the MultiAir system is quite costly due to the complicated design with countless tiny components and the lengthy disassembly/assembly method.
The engine, on the other hand, is indifferent. It's a tad noisy, but that has nothing to do with its durability or longevity. If you keep an eye on the oil level and change it more often than the guidebook suggests, the 2.4-liter Tigershark can last 150-200k miles.