Jeep’s Tiny 2.0-Liter Turbo Four Now Outguns the Pentastar V6

Four cylinders beating a V6 used to be a punchline. Now it’s the reality sitting under the hood of the 2026 Jeep Grand Cherokee. Jeep’s new 2.0-liter Hurricane 4 Turbo produces 324 horsepower and 332 lb-ft of torque, comfortably surpassing the long-running 3.6-liter Pentastar V6 in both power and fuel economy. It’s a sign that the good old days of counting cylinders to guess an engine’s strength are officially over.

• The Hurricane 4 Turbo makes 324 horsepower and 332 lb-ft of torque, with a segment-leading 162 horsepower per liter.
• It produces 31 more horsepower and 72 more lb-ft of torque than the Pentastar V6, while returning 23 mpg combined versus 22.
• The engine debuted in the 2026 Grand Cherokee and is expected to spread across the Jeep lineup soon.

Race-Bred Tech in a Family SUV

So how does Jeep squeeze V6 power from a little four-banger? The answer comes down to a technology called Turbulent Jet Ignition, or TJI. It’s a Formula 1-derived combustion technology borrowed from the Maserati MC20’s Nettuno V6, retuned for Jeep.

Each cylinder houses a tiny cup-like pre-chamber with small holes that allow the air-fuel mixture to enter and be ignited by a spark plug during the compression stroke, providing a space where combustion can occur more consistently and completely. Think of it as a controlled mini-explosion that kicks off a bigger, cleaner burn in the main chamber. The result is that the engine wrings out every last drop of energy from each combustion cycle.

Each cylinder also has a second spark plug, typically used under low-load conditions, though the two plugs don’t fire at the same time. That’s eight spark plugs total for a four-cylinder, which is pretty wild when you think about it.

Dual Injection and a Miller Cycle Twist

The Hurricane engine also features dual fuel injection per cylinder, both direct and port, and these systems can operate independently or together depending on the situation. During cold starts, both systems fire to help the catalytic converter light off quickly. At idle and low loads, port injection takes over to keep noise and vibration down. When you put your foot down and want full power, both systems team up.

The engine pairs this combustion and turbocharging with a Miller Cycle operating strategy that closes the intake valves early to squeeze more from each combustion event while cutting emissions. This allows the Hurricane 4 Turbo to run a high 12:1 compression ratio without the risk of engine knock while using regular 87-octane gasoline. That said, Jeep says the engine will only make peak power with premium fuel.

A variable-geometry turbocharger with active vanes inside the housing pumps out as much as 35 psi of boost, and 90% of the engine’s peak torque is available between 2,600 and 5,600 rpm. That broad torque band means you’re not waiting around for boost to build during highway passes or merging.

Built Tougher Than Its Predecessor

One fair concern with small-displacement turbocharged engines is durability. Jeep says they addressed that from the start. Like the larger Hurricane I6, the Hurricane 4 Turbo uses an ultra-thin Plasma Transfer Wire Arc (PTWA) coating in the cylinder bores that is 10 times more resistant to wear than conventional iron liners, and a die-cast deep skirt aluminum block with cylinder bore walls 24% thicker than the company’s current 2.0-liter engine.

The Hurricane 4’s chief engineer, Ashish Dubey, says durability was a priority even as they pushed the limits of specific output, applying lessons learned from the high-output Hurricane inline-six. An electric water pump and variable displacement oil pump also reduce parasitic losses.

Variable intake timing is adjusted by an electric camshaft phaser for smoother startups, and the exhaust valves are sodium-filled for heat management. These are small details that add up to an engine that Jeep hopes can go the distance.

Where You’ll Find It and What It Costs

The new 2.0-liter four-cylinder isn’t available on the 2026 Grand Cherokee Laredo and Laredo X. It’s offered on the Laredo Altitude and higher trims, which start at $43,855. The Laredo and Laredo X models still get the 3.6-liter Pentastar V6.

Like many turbocharged engines, the new 2.0-liter can feel a bit lazy from a dead stop. Until the exhaust gases get the turbo spinning, the engine feels less powerful than the V6. But that’s really only at low speeds. On the freeway and in the canyons, the new engine feels punchier than the old V6, and the four-cylinder doesn’t feel overly taxed despite the Grand Cherokee’s size.

There’s also the question of long-term reliability. It’s still too early to say what issues the new Hurricane engine might develop. Stellantis has already dealt with recalls and problems involving the 4xe plug-in hybrid powertrain before it was dropped from the Grand Cherokee, so the hope is that this new engine won’t end up facing the same fate.

Can Four Cylinders Really Replace Six?

The numbers don’t lie. Jeep’s Hurricane 4 Turbo makes 31 more horsepower, 72 more lb-ft of torque, and returns slightly better fuel economy than the Pentastar V6 it sits alongside. With hybridization down the road, the Hurricane 4 Turbo could produce well over 400 horsepower. That would give it enough grunt for vehicles as large as the Grand Wagoneer, and there’s also potential for the 324-hp version to find its way into smaller products like the new Cherokee.

If you told someone ten years ago that a Jeep’s best engine option would be a turbocharged four-cylinder borrowed from racing technology, they’d have laughed. But that’s exactly where the industry is headed, and Jeep’s new four-cylinder makes more power than a V6 while sipping less gas along the way. The Hurricane 4 Turbo makes a pretty convincing case that fewer cylinders can still mean more fun behind the wheel.