Automotive group Stellantis has officially revealed a major upgrade to its 2.0-liter turbocharged four-cylinder engine. Agora commercially designated as Hurricane 4 EVO, the powerplant receives substantial engineering modifications to increase both gross performance and energy efficiency. The project uses advanced mechanical concepts to meet the growing demands of the global market for more powerful vehicles with lower pollutant emissions.
Originally introduced to the public around a decade ago under the hood of the Alfa Romeo Giulia sedan, the mechanical base has undergone a complete overhaul of its internal components. The most notable addition to the set is the implementation of a pre-chamber ignition system, a technology directly derived from the Fórmula 1 race cars.
The debut of this updated engine is already scheduled for the North American market. The engine will power the new generation of the Jeep Grand Cherokee sports utility vehicle, marking the beginning of a transition phase for the brand’s portfolio. Posteriormente, the manufacturer plans to expand the use of this equipment to other models and regions, standardizing its high-performance mechanical offering across different vehicle platforms.
Advanced ignition system
The core of the transformation in the Hurricane 4 EVO lies in the adoption of the Ignição system by Jato Turbulento, known by its acronym in English TJI. Esta technology consists of a pre-combustion chamber located above the main cylinder, exactly where the spark plug is housed. The mechanism fundamentally changes the way the air and fuel mixture is burned during engine operation.
During the compression phase, a small portion of the combustible mixture is forced into this prechamber. Quando the candle fires, creating a jet of high-energy plasma that is expelled through small holes into the main chamber. Este process ensures considerably faster, more uniform and complete combustion when compared to traditional direct ignition systems found in most passenger vehicles.
Automotive engineers point out that this technical solution is similar to the mechanism found in high-performance supercars, such as the Maserati MC20 with its 3.0 V6 Nettuno engine. The application of this system in a large-scale production engine represents a significant technical advance for the group’s internal combustion vehicles, bringing street cars closer to competition tracks.
Power and torque gains
The implementation of the TJI system, combined with other structural improvements, resulted in a significant jump in engine performance numbers. Enquanto the current version of the 2.0 turbo engine delivers 272 horsepower and 40.8 kgfm of torque, the EVO variant increases these figures considerably. The new calibration extracts 337 horsepower, providing a more robust and agile dynamic response, an essential characteristic for moving larger and heavier vehicles.
Power delivery was also a priority during the development of the new engine. The engineering team managed to ensure that 90% of the maximum torque of 45.9 kgfm is available across a wide rev range, specifically between 2,600 and 5,600 rpm. Peak power, in turn, is reached at 6,000 rpm. Esta flat torque curve guarantees strong and constant acceleration, facilitating overtaking maneuvers and improving towing capacity, a crucial factor for SUVs and pickup trucks that will receive this engine.
Optimization of fuel consumption
In addition to the gross increase in power, the design of the Hurricane 4 EVO focused intensely on energy efficiency. The faster and more complete combustion provided by the pre-chamber system significantly reduces the emission of unburned polluting gases from the exhaust.
This optimization allows the engine to extract more energy from each drop of fuel injected into the cylinders. According to technical data provided by the manufacturer, the new generation consumes around 10% less fuel, while delivering 20% more power when compared to its direct predecessor.
To maximize these numbers, the engine operates with a high compression ratio of 12:1 and uses the Miller thermodynamic cycle. Este cycle delays the closing of the intake valves, reducing the effort required to compress the mixture and improving the overall thermal efficiency of the mechanical assembly.
In practical applications, the results are evident in the vehicles’ technical data sheet. A large sports utility vehicle equipped with this engine, even weighing more than 2,800 kg, is capable of accelerating from 0 to 100 km/h in a range of 6.0 to 7.0 seconds, maintaining an estimated combined fuel consumption of 9.8 km/l.
Structural modifications and noise reduction
To withstand the increased power and greater internal pressure without compromising long-term durability, the engine block underwent rigorous structural revisions. The piston bore and stroke dimensions remain at 84 millimeters and 90 millimeters respectively, but the cylinder walls are now thicker to withstand the additional stress. The turbocharger is an entirely new component, featuring variable geometry technology capable of generating up to 35 psi of working pressure, which drastically reduces the delay in throttle response at low revs. Além In addition, the engineering team paid special attention to reducing Ruído, Vibração and Aspereza. The piston skirts have been given a special polymer coating to minimize internal friction, while the main and connecting rod bearings have been resized to ensure smooth running. A new fluid-filled crankshaft vibration damper has also been installed to absorb mechanical shocks, resulting in a quieter, more refined driving experience, even under severe acceleration.
Automaker’s market strategy
The introduction of the Hurricane 4 EVO is part of a broader strategy by Stellantis to rationalize its global engine lineup. The main goal is to gradually replace older naturally aspirated engines with smaller, turbocharged units that offer superior performance and lower emissions.
Specifically, this new 2.0-liter four-cylinder engine is designed to take the place of the traditional 3.6 V6 Pentastar engine. By offering more torque and power than the V6, the turbocharged unit meets current market demands for engine downsizing without sacrificing the load capacity and traction expected by consumers.
Implementation on the assembly line
The transition to the new engine will occur in well-defined stages, starting with high-value-added models in the market from América to Norte. As production scales up and manufacturing costs are spread, the technology will be integrated into a wider range of vehicles across different brands within the automotive group, standardizing mechanical architecture globally and optimizing the company’s supply chain.
Outlook for the global fleet
While the initial launch will focus on the Estados Unidos, the global nature of the Stellantis platforms indicates that the Hurricane 4 EVO will reach other markets in the medium term. Veículos that currently use the 272 horsepower version of the engine are natural candidates to receive the EVO update in future mid-life restyling or new generation launches.
The continued investment in internal combustion technologies demonstrates the manufacturer’s commitment to offering efficient mechanical options. The application of innovations tested on the race tracks in everyday vehicles reinforces the technical capacity of the engineering divisions involved in the project, guaranteeing the survival of combustion engines with high levels of onboard technology.
