Son of Slant Six: Meet Stellantis Hurricane Inline 6-Cylinder Engine | Daily Drive | Consumer Guide® The Daily Drive
The Stellantis Hurricane engine will be available in standard (left) and HO (High Power) variants.
Stellantis, the parent company of Chrysler, Dodge, Jeep and Ram in the US, has unveiled a new line of six-cylinder engines called the Hurricane. The twin-turbo 3.0-liter inline engine is designed to match the power of a naturally-aspirated V8, while being more fuel-efficient and less polluting.
The Hurricane engine is also designed to be integrated into hybrid and plug-in-hybrid powertrains due later this decade.
These engines are expected to appear this year in Jeep’s Wagoneer/Grand Wagoneer family, and will be available in the Grand Cherokee and Ram 1500 pickup trucks soon after. The Dodge Durango can also be equipped with a Hurricane engine.
An American Stellantis brand car has not been offered since 4.0 liter six was dropped from the Jeep lineup after 2006.
March 25, 2022, Auburn Hills, Mich. – Stellantis today revealed a 3.0-liter, twin-turbocharged, in-line six-cylinder engine, dubbed the Hurricane, that delivers better fuel economy and lower emissions than larger engines. at the same time producing more horsepower and torque than many competitors’ naturally aspirated V-8s and boosted six-cylinder powerhouses.
Designed with an inherently smooth I-6 configuration and state-of-the-art technology, Hurricane’s powerful twin-turbo base architecture allowed Stellantis propulsion system engineers to create two distinct variants. :
- Standard Output (SO): Optimized for fuel economy, including the use of a cooled exhaust gas recirculation (EGR) system, while providing enhanced power and torque ( more than 400 hp / 450 lb.-ft. of torque)
- High Output (HO): Optimized for excellent performance (more than 500 hp / 475 lb.-ft.) while maintaining substantial fuel economy during heavy use, such as such as towing.
The Hurricane twin-turbo engine achieves the same performance as this V-8 while being up to 15% more efficient than the larger engine.
“As Stellantis aims to be the U.S. leader in electrification, with sales of 50% of battery-electric vehicles (BEVs) by 2030, the internal combustion engine will play an important role in the list. our investment for many years to come and we are indebted to our customers and the environment to deliver the cleanest, most efficient engine possible,” said Micky Bly, head of Stellantis engine systems . “The Hurricane twin-turbo engine is an engine with no compromises, delivering better fuel economy and significant greenhouse gas reductions without asking our customers to give up performance.”
Reducing greenhouse gas emissions is part of Stellantis’ commitment to cut carbon emissions by 50% by 2030 and lead the transportation industry by achieving Net Carbon Zero by 2038. Those goals are: the main elements of Stellantis Dare to go to 2030 strategy plan.
The Hurricane’s twin-turbo engine flexes its muscles with a wide, flat torque range that helps the engine maintain at least 90% of peak torque from 2,350 rpm to the red line.
Specific horsepower and torque ratings will vary by vehicle type. The first cars with the Hurricane’s twin-turbo I-6 hit dealership showrooms this year.
The basis of the twin turbocharger Hurricane is a deep grooved cast aluminum block with an aluminum alloy oil pan construction. The cross bolted steel main bearing cover houses the powerful rotating assembly of the forged steel crankshaft and forged steel connecting rods. During manufacturing, the block is sanded to the deck plate to optimize the cylinder bore geometry, which improves fuel efficiency.
Stellantis propulsion engineers used a state-of-the-art set of technologies for the twin turbocharger Hurricane engine to reduce emissions and achieve great engine power:
- Two low-inertia, high-flow turbochargers, three-cylinder each, for quick response to throttle input
- Coating of plasma transfer wire (PTWA) in bore cylinder for ultra-thin, low-friction wear surface
- High pressure direct fuel injection (5,075 psi / 350 bar) with pump (single for SO / dual for HO) actuated by a dedicated chain drive shaft
- Dual overhead camshaft with fully independent variable valve timing, wide range
- Engine start-stop (ESS) function saves fuel with powerful engine starting for quick restart
- Engine mounted water-air intake cooler with dedicated cooling circuit (single input for SO / dual input for HO)
- Water-cooled dual exhaust pipes integrated in the cylinder head
- Intermittently changeable oil pump with built-in filter stage adjusts pump power to match engine needs, reducing friction loss and helping to save fuel
- High-flow ball-valve thermostat minimizes restrictions in the cooling system, reducing mechanical losses
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The amazing power of air
Each turbocharger in the twin-turbo I-6 supplies three cylinders. From a performance standpoint, two smaller turbochargers with less inertia will spin faster and deliver power to the engine at lower rpm than one large turbocharger.
Compressed air passes through an air-cooled intake air cooler to lower its temperature before entering the intake manifold. Cooler air is denser, allowing better performance through advanced ignition timing and helping to manage temperature in the cylinders. An electric pump circulates the coolant after the engine has stopped to help cool the turbochargers for improved durability.
High pressure direct fuel injection system runs at 5,075 psi (350 bar) and uses centrally mounted injectors in the cylinder head combustion chamber. This design promotes smoother fuel injection and super fine control of fuel delivery into the cylinders to create the optimal air/fuel mixture, enhanced by the turbocharger intake, for power. higher and lower emissions.
Hurricane’s turbochargers are optimized for each version. The turbos on the Hurricane SO provide a maximum gain of 22 psi, while the turbos on the Hurricane HO provide a maximum gain of 26 psi.
Helping the Hurricane HO deliver enhanced performance are forged aluminum, oil-jet-cooled, light-weight pistons with anodized top washers and diamond-like coating (DLC) on the pins for reduction minimize friction. Hurricane HO runs at a compression ratio of 9.5:1 and uses high-octane 91 fuel.
With a focus on fuel economy, the Hurricane SO uses die-cast aluminum pistons with cast-iron top rim earth inserts, running at a compression ratio of 10.4:1. It uses a cooled EGR that reduces losses engine pumping and temperature management in the cylinders. High grade fuel should be used.
Tough coating for cylinders
Less friction, reduced weight and unparalleled wear resistance from the thermally sprayed microstructure of metal components and metal modified oxides are the main benefits of PTWA coating inside cylinders, An alternative to cast-in-place or traditional cast-iron cylinder liners. The PTWA coating is super thin, compared to 3 to 4 mm of cast iron lining and is 10 times more resistant to wear.
Reduced friction throughout the engine improves performance, reduces emissions and fuel consumption.
PTWA coating was applied to the Hurricane block during production at Saltillo Engine Factory. The process, modeled on the aerospace industry, melts a steel alloy wire at 2,300 degrees Celsius (4,150 degrees Fahrenheit), creating microscopic particles that erupt into cylinders at high velocity, where the particles This particle cools to form a coating and forms a material that binds to the cylindrical hole of aluminum. The surface honing gives it an ultra-fine cruciform pattern with controlled micro-porosity for oil retention.
The PTWA injection process leaves more aluminum between the cylinders for better heat transfer and engine cooling. This allows engine engineers to optimize the air-fuel mixture and improve ignition (spark) timing over a wide operating range, another mechanism to reduce carbon dioxide and other emissions. .
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The twin-turbo 3.0-liter Hurricane I-6 shares design characteristics, including diameter and cylinder spacing, with the globally-produced 2.0-liter turbocharged I-4. In North America, the 2.0-liter engine is available on the Jeep® Wrangler, Wrangler 4xe, Cherokee and the recently launched Grand Cherokee 4xe.
The twin-turbo I-6 Hurricane is the future primary internal combustion power plant in North America for vehicles using the STLA Large and STLA Frame platforms.
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