The Stellantis Hurricane is a 3.0-liter twin-turbocharged gasoline inline-six. Two quick-spooling turbochargers, high-pressure direct injection, water-to-air charge cooling and extensive valve and thermal management let it deliver V8-level output from a compact six-cylinder design. Its Standard Output (SO) and High Output (HO) versions share the basic architecture but use different boost, compression, fuel-system and calibration strategies.
What the Hurricane engine is
Hurricane is Stellantis’ 3.0-liter gasoline engine family for vehicles built on the company’s STLA Large and STLA Frame architectures. It is manufactured at the Saltillo Engine Plant in Mexico. The engine first appeared in Jeep Wagoneer-family vehicles and later entered the Ram 1500 lineup. Stellantis says power and torque vary with the vehicle calibration, so an advertised Hurricane figure is not automatically a universal engine rating.
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An inline-six has an inherent mechanical smoothness because its reciprocating forces are naturally balanced. That gives the Hurricane a refined baseline without the secondary vibration challenges associated with many four- and six-cylinder layouts.
How its twin-turbo system works
Two three-cylinder turbo groups
The six cylinders are divided into two groups of three, with each group feeding a low-inertia, high-flow turbocharger. Using two smaller turbos instead of one very large unit reduces the amount of rotating mass each turbo must accelerate. They can therefore build boost quickly at lower engine speed while still supplying the airflow needed for high output.
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The arrangement is intended to provide a broad torque curve rather than a narrow high-rpm power peak. Stellantis’ technical description says the engine maintains at least 90 percent of peak torque from 2,350 rpm to the redline. That is a factory statement, not an independent test result.
Water-to-air charge cooling
After the turbos compress the intake air, it passes through an engine-mounted water-to-air charge cooler before reaching the intake manifold. Compressing air raises its temperature; cooling it makes the charge denser and helps control in-cylinder temperatures. The engine controller can then use more favorable ignition timing than it could with a hotter, less dense charge under the same load.
Stellantis lists peak boost of 22 psi for the original SO description and 26 psi for the original HO description. Those are family-level factory figures from the 2022 technical material; a particular vehicle’s calibration can differ.
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How fuel and valve timing are controlled
5,075-psi direct injection
Centrally located direct injectors operate at 5,075 psi (350 bar). High pressure atomizes fuel finely and gives the controls precise command of the air-fuel mixture during boost and transient operation.
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A dedicated chain-driven shaft powers the high-pressure fuel pumps. SO engines use one pump; HO engines use two. The two-pump arrangement supplies the additional fuel-flow capacity required by the HO specification.
Independent variable valve timing
Dual overhead camshafts use wide-range, fully independent variable valve timing. The controller can alter intake and exhaust valve events separately, balancing airflow, emissions, torque response and efficiency across the operating range.
The SO version also uses cooled exhaust-gas recirculation (EGR). Stellantis says this reduces pumping losses and helps manage in-cylinder temperatures. Engine stop-start is paired with a robust starter so the engine can restart quickly when the vehicle’s control system shuts it off at a stop.
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Block, crankshaft and low-friction details
Structural foundation
- Deep-skirt cast-aluminum block.
- Structural aluminum oil pan.
- Cross-bolted steel main-bearing caps.
- Forged steel crankshaft and forged steel connecting rods.
During manufacture, the block is deck-plate honed. Stellantis uses that process to improve bore geometry, which can reduce friction and support fuel efficiency.
PTWA cylinder-bore coating
The bores use Plasma Transfer Wire Arc (PTWA), an ultra-thin sprayed steel-alloy surface. The process melts wire at approximately 2,300°C (4,150°F), sprays the alloy onto the cylinder walls and then hones it to a fine cross-hatch with controlled porosity for oil retention. Because the coating is thin, more aluminum remains between cylinders to help transfer heat, while the finished surface reduces friction and wear compared with a conventional heavy iron liner.
How the Hurricane manages heat and oil
Separate high- and low-temperature cooling circuits
The high-temperature circuit uses a belt-driven water pump and a low-restriction ball-valve thermostat. An electric after-run pump can continue circulating coolant through the turbochargers after the engine is switched off, limiting heat soak during shutdown.
A separate low-temperature circuit uses an electric pump to serve the water-to-air charge cooler. Keeping charge-cooler flow in its own circuit allows the intake charge to be managed independently of the hotter engine-coolant loop.
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Demand-controlled lubrication
A continuously variable-displacement oil pump adjusts flow to demand. Its integrated scavenge stage helps control oil return while limiting the parasitic loss of pumping more oil than the engine requires at a given load.
Hurricane SO versus Hurricane HO
The following figures separate Stellantis’ original family descriptions from ratings published for a specific vehicle. “More than” figures are not the same as a precise production-vehicle rating.
| Specification | Hurricane SO | Hurricane HO | How to read it |
|---|---|---|---|
| Original family output | More than 400 hp and 450 lb-ft | More than 500 hp and 475 lb-ft | Stellantis family descriptions, 2022; not universal vehicle ratings. |
| Compression ratio | 10.4:1 | 9.5:1 | Factory family specifications. |
| Peak boost | 22 psi | 26 psi | Factory family figures; vehicle calibration may vary. |
| Direct-injection pumps | One high-pressure pump | Two high-pressure pumps | Driven by a dedicated chain-driven shaft. |
| Fuel requirement | Not stated in the cited family description | 91-octane premium required in the published HO specification | Confirm the fuel specification for the exact vehicle and market. |
| Cooled EGR | Yes | Not stated in the cited family description | Do not assume the same EGR hardware or calibration without the vehicle’s service information. |
| Piston construction | Not stated in the cited factory comparison | Not stated in the cited factory comparison | The published material does identify forged steel crankshafts and connecting rods for the engine foundation. |
| Cooling demand or capacity | Not stated as a separate rating | Not stated as a separate rating | Both use the two-circuit cooling architecture; detailed capacity differences are application-specific. |
What the numbers look like in a 2025 Ram 1500
| 2025 Ram 1500 version | Rated horsepower | Rated torque | Qualification |
|---|---|---|---|
| Hurricane SO | 420 hp | 469 lb-ft | Ram/Stellantis rating for the 2025 Ram 1500. |
| Hurricane HO | 540 hp | 521 lb-ft | Ram/Stellantis rating for the 2025 Ram 1500. |
Those Ram figures should not be substituted for every Hurricane application. For example, the 2023 Wagoneer application is listed at 420 hp and 468 lb-ft, with up to 24 mpg highway. The one-pound-foot difference from the Ram SO rating illustrates why the vehicle, model year and calibration must accompany any Hurricane specification.
Why use an inline-six instead of a V8?
The Hurricane combines the smoothness of a naturally balanced inline-six with turbocharging that can produce high torque from a smaller displacement. Its two-turbo layout supports fast response, while direct injection, variable valve timing, cooled EGR on SO and separate thermal circuits address efficiency and temperature control.
Stellantis claims up to 15 percent greater efficiency than larger engines. That is a manufacturer claim whose result depends on the comparison engine, vehicle, gearing, drive cycle and calibration; it is not a universal fuel-economy guarantee.
“The Hurricane twin-turbo is a no-compromise engine that delivers better fuel economy and an important reduction in greenhouse gases without asking our customers to give up performance.”
— Micky Bly, Stellantis head of propulsion systems
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Is the Hurricane replacing the Hemi?
It is too broad to describe the Hurricane as a single, universal Hemi replacement. The documented rollout places it in Wagoneer-family vehicles and the Ram 1500, and Stellantis positions the engine family for STLA Large and STLA Frame vehicles. That supports a strategy of using the turbocharged inline-six in selected applications, but the supplied vehicle data does not establish one company-wide replacement schedule for every Hemi model, market or model year.
For a buying or service decision, use the exact vehicle’s engine designation, model year, fuel requirement and rating. Availability, oil specifications, service parts and calibration can differ by application and market.
Quick Recap
What owners should verify for a specific vehicle
- Whether the vehicle has Hurricane SO or HO, rather than relying only on “3.0-liter Hurricane” wording.
- The model-year horsepower and torque rating published for that vehicle.
- The required octane; the cited HO specification requires 91-octane premium, while the SO fuel requirement is not established by the family description.
- The vehicle’s approved oil grade, capacity and service interval.
- Parts and cooling-system procedures specific to the VIN and market.
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