Jeep Jeep upcoming Straight Six: Hurricane

Greg

I run a tight ship... wreck
Admin
I've been hearing about this engine which has been in the works for awhile now, called the Hurricane. It's supposed to be the replacement for the aging 3.6 Pentastar V6 as well as other less efficient engines.



It sounds very interesting, it's a 3.0 liter Inline Six and is supposed to have twin turbos! There will be a standard and high output version. :eek:

There are claims that the new Hurricane 3.0 will offer power outputs ranging from around 360 horsepower on up to more than 500 horsepower. 🤯

Nicknamed the GME-T6 (Global Medium Engine - Turbo 6), it will be mated to the impressive ZF-8HP 8 speed automatic transmission.

Everyone knows that inline sixes offer an excellent torque curve and a smooth running nature, combining that cylinder layout with boost and modern technology, we'll see a pretty powerful and efficient engine option for the next generation Jeeps. It's planned for the Wrangler, Gladiator, Grand Cherokee and Wagoneer as well as the Dodge Ram 1500.

Sounds like the Dodge Challenger will also see the high output version of this straight six, as Stellantis has announced that they're retiring the Hemi V8.


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Stephen

Who Dares Wins
Moderator
I've been hearing about this engine which has been in the works for awhile now, called the Tornado. It's supposed to be the replacement for the aging 3.6 Pentastar V6 as well as other less efficient engines.



It sounds very interesting, it's a 3.0 liter Inline Six and is supposed to have a twin turbo! There will be a standard and high output version. :eek:Nicknamed the GME-T6, it will be mated to the impressive ZF-8HP 8 speed automatic transmission.

Everyone knows that inline sixes offer excellent torque and a smooth running nature, I think combining that cylinder layout with boost and modern technology, we'll see a pretty powerful and efficient engine option for the next generation Jeeps. It's planned for the Wrangler, Gladiator, Grand Cherokee and Wagoneer as well as the Dodge Ram 1500.

Sounds like the Dodge Challenger will also see the high output version of this straight six, as Stellantis has announced that they're retiring the Hemi V8.


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I think this is really a cool engine. It'll be interesting to actually see how it performs. But, "That thing got a Tornado?" Doesn't have quite the same ring to it, does it? :D
 

Greg

I run a tight ship... wreck
Admin
I think this is really a cool engine. It'll be interesting to actually see how it performs. But, "That thing got a Tornado?" Doesn't have quite the same ring to it, does it? :D

I'm hoping it'll be a rocket of an engine. I'm sure with a little aftermarket tuning, tweaking the fuel, timing and boost... it'll be capable of pretty substantial power.

I wonder if the name is in reference to the turbos? But yeah... I hear ya. That said, it's not like the name 'Pentastar' rolls off the tongue!
 

mbryson

.......a few dollars more
Supporting Member
I think the inline will be a good move from the V6 for sure. I don't know about you other folks with EcoBoost motors but I'm not especially fond of them in snowy conditions. Otherwise, pretty happy but still suspect on longevity. There's just something about a V8 that just works.
 

frieed

Jeepless in Draper
Supporting Member
Location
Draper, UT
I think the inline will be a good move from the V6 for sure. I don't know about you other folks with EcoBoost motors but I'm not especially fond of them in snowy conditions. Otherwise, pretty happy but still suspect on longevity. There's just something about a V8 that just works.
what don't you like ?
 

Greg

I run a tight ship... wreck
Admin
Stellantis Debuts Hurricane Twin-turbo I-6 Engine That Cuts Emissions, Increases Fuel Economy And Is More Powerful
  • New 3.0-liter Hurricane twin-turbo, inline, six-cylinder engine puts out less tailpipe emissions and uses less gasoline than larger engines, yet delivers V-8 levels of power
  • Robust architecture enables Stellantis Propulsion Systems to deliver two distinct variants – one tuned for efficiency, one tuned for performance
  • Hurricane twin-turbo I-6 designed to account for potential future integration with electrification for low-emission vehicles (LEVs)
  • Two low-inertia turbochargers power the Hurricane’s rapid response to throttle inputs, along with enhanced torque output for chores such as towing without sacrificing fuel economy
  • State-of-the-art technologies include Plasma Transfer Wire Arc (PTWA) sprayed cylinder coating, high-pressure gasoline direct injection
  • First vehicles with Hurricane reach dealership showrooms this year
  • Cleaner-running Hurricane twin-turbo moves Stellantis toward its commitment of a 50% reduction in carbon emissions by 2030 and to be Carbon Net Zero by 2038, key elements of the Dare Forward 2030 strategic plan
March 25, 2022 , Auburn Hills, Mich. - Stellantis today revealed its new, 3.0-liter, twin-turbo, inline, six-cylinder engine, named Hurricane, that delivers better fuel economy and fewer emissions than larger engines while at the same time generates more horsepower and torque than many competitors’ naturally aspirated V-8 and boosted six-cylinder power plants.

Designed with an inherently smooth-running I-6 configuration and state-of-the-art technology, the Hurricane twin-turbo’s robust base architecture enables Stellantis propulsion systems engineers to create two distinct variants:
  • Standard Output (SO): Optimized for fuel economy, including the use of cooled exhaust gas circulation (EGR), while delivering enhanced power and torque (more than 400 hp/450 lb.-ft. of torque)
  • High Output (HO): Optimized for great performance (more than 500 hp/475 lb.-ft.) while maintaining significant fuel economy during heavy use, such as towing.
The Hurricane twin-turbo achieves this V-8-rivaling performance while being up to 15% more efficient than larger engines.

“As Stellantis aims to become the U.S. leader in electrification, with a 50% battery-electric vehicle (BEV) sales mix by 2030, internal combustion engines will play a key role in our portfolio for years to come and we owe it to our customers and the environment to provide the cleanest, most efficient propulsion possible,” said Micky Bly, Stellantis head of propulsion systems. “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.”

Reducing greenhouse gas emissions is one part of Stellantis’ commitment to cut its carbon footprint by 50% by 2030 and to lead the transportation industry by achieving Net Carbon Zero by 2038. Those goals are key elements of the Stellantis Dare Forward 2030 strategic plan.

The Hurricane twin-turbo flexes its muscle with a broad, flat torque band that sees the engine maintain at least 90% of peak torque from 2,350 rpm all the way to its red line.

Specific horsepower and torque ratings will vary based on vehicle. The first vehicles powered by the Hurricane twin-turbo I-6 reach dealership showrooms this year.

The foundation of the Hurricane twin-turbo is a deep-skirt cast-aluminum block with a structural aluminum alloy oil pan. Cross-bolted steel main bearing caps contain the strong rotating assembly of a forged steel crankshaft and forged steel connecting rods. During manufacturing the block is deck-plate honed to optimize the cylinder bore shape, which helps improve fuel efficiency.

Stellantis propulsion system engineers employed a suite of state-of-the-art technologies for the Hurricane twin-turbo to deliver reduced emissions and attain big-engine power:

  • Two low-inertia, high-flow turbochargers, each feeding three cylinders, for rapid response to throttle inputs
  • Plasma Transfer Wire Arc (PTWA) coating in the cylinder bores for an ultra-thin, low-friction wear surface
  • High-pressure (5,075 psi/350 bar) direct fuel injection with pumps (single for SO/dual for HO) actuated by a dedicated chain-driven shaft
  • Dual overhead camshafts with wide-range, fully independent variable valve timing
  • Fuel-saving engine stop-start (ESS) function with robust starter motor for quick restarts
  • Engine-mounted water-to-air charge cooler with a dedicated cooling circuit (single inlet for SO/dual inlet for HO)
  • Dual water-cooled exhaust manifolds integrated in the cylinder head
  • Continuously variable displacement oil pump with integrated scavenge stage tailors pump output to engine demand, reducing frictional losses and helping save fuel
  • High-flow ball-valve thermostat minimizes restriction in the cooling system, reducing mechanical losses
The Incredible Power of Air
Each turbocharger in the Hurricane twin-turbo I-6 feeds three cylinders. From a performance standpoint, two smaller turbochargers with less inertia spin up faster and deliver boost to the engine at lower rpm than a single, large turbo.

The compressed air passes through an engine-mounted water-to-air charge air cooler to reduce its temperature before entering the intake manifold. Cooler air is denser, enabling better performance via advanced ignition timing, and helping manage in-cylinder temperatures. An electric pump circulates coolant after the engine is shut down to help cool the turbocharger units for enhanced durability.

The high-pressure direct fuel injection system runs at 5,075 psi (350 bar) and uses injectors mounted centrally in the cylinder head combustion chamber. This design promotes finer atomization and super-fine control of fuel delivery into the cylinder for the optimum air/fuel mixture, enhanced by the turbocharged intake air, for higher power and lower emissions.

The Hurricane’s turbochargers are optimized for each version. The turbos on the Hurricane SO deliver peak boost of 22 psi, while the Hurricane HO turbos deliver 26 psi of peak boost.

Helping the Hurricane HO deliver its enhanced performance are lightweight, oil-jet cooled, forged aluminum pistons with an anodized top ring land and a diamond-like coating (DLC) on the pins to minimize friction. The Hurricane HO runs with a 9.5:1 compression ratio and uses 91 octane premium fuel.

With a focus on fuel economy, the Hurricane SO uses cast aluminum pistons with cast iron top ring land insert, running with a 10.4:1 compression ratio. It’s use of cooled EGR helps reduce engine pumping losses and manage in-cylinder temperatures. Premium fuel is recommended.

Tough Coating for the Cylinders
Less friction, reduced weight and unparalleled wear resistance from a thermal sprayed microstructure of metallic and oxide components that metallurgically transform are the key benefits of the PTWA coating inside the cylinders, an alternative to the traditional cast-in-place or pressed-in cast iron cylinder liners. The PTWA coating is ultra-thin, compared with 3 to 4 millimeters of a cast iron liner and has 10 times the wear resistance.

Minimizing friction throughout the engine enhances its efficiency, reducing its emissions and fuel consumption.

The PTWA coating is applied to the Hurricane block during the manufacturing process at the Saltillo Engine Plant. The process, adapted from the aerospace industry, melts a steel alloy wire at 2,300 degrees Celsius (4,150 degrees Fahrenheit), producing microscopic particles sprayed onto the cylinder walls at high velocities, where the particles splat-cool to form the coating and form a physical bond to the aluminum cylinder bore. Honing the surface gives it a super-fine cross hatch pattern with controlled micro porosity for oil retention.

The PTWA spray process leaves more aluminum between the cylinders for better heat transfer and engine cooling. This enables propulsion engineers to optimize the air-fuel mixture and advance the ignition timing (spark) over a wide operating range, another mechanism to reduce carbon dioxide and other emissions.


New Member of the Stellantis Propulsion System Family

The 3.0-liter Hurricane twin-turbo I-6 shares design features, including bore and stroke and cylinder spacing, with the globally produced turbocharged 2.0-liter I-4. In North America, the 2.0-liter engine is currently available in the Jeep® Wrangler, Wrangler 4xe, Cherokee and recently launched Grand Cherokee 4xe.

The Hurricane twin-turbo I-6 is the primary internal combustion power plant of the future in North America for vehicles using the STLA Large and STLA Frame platforms.

The 3.0-liter Hurricane twin-turbo I-6 is produced at Stellantis’ Saltillo Engine Plant in Mexico.

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mbryson

.......a few dollars more
Supporting Member
Wow.... interesting and scary at the same time. Cool info on the turbo chargers feeding 3 cyl each and the injectors are in the head so they're likely to be relatively easy to service?

The bore thing is WAY interesting/scary. Sounds like it can't be bored to rebuild due to the microscopic stuff getting sprayed on the cylinder walls? Makes it essentially a "throwaway" engine? (maybe they have serviceable sleeves?)
 

Gravy

Ant Anstead of Dirtbikes
Supporting Member
PTWA is pretty standard on many motorcycle engines and F1, these applications see in excess of 14k redlines and that's awesome compared to *maybe 6k* in a standard big displacement passenger vehicle. Ford has used it since maybe 2016 on their voodoo engine when their goal was 8k rpm.
The friction advantage is incredible.
The only real drawback is that it is more unhappy with injesting any dirt. Steel liners don't transfer heat as efficiently to an aluminum block as a coated cylinder so that's a plus too.
 

mbryson

.......a few dollars more
Supporting Member
PTWA is pretty standard on many motorcycle engines and F1, these applications see in excess of 14k redlines and that's awesome compared to *maybe 6k* in a standard big displacement passenger vehicle. Ford has used it since maybe 2016 on their voodoo engine when their goal was 8k rpm.
The friction advantage is incredible.
The only real drawback is that it is more unhappy with injesting any dirt. Steel liners don't transfer heat as efficiently to an aluminum block as a coated cylinder so that's a plus too.



So if a wrist pin or similar comes loose and scores the cylinder wall, is the jug is junk on a motorcycle? Good to hear it's not the upcoming Vega of the 2020's
 

glockman

I hate Jeep trucks
Location
Pleasant Grove
Wow.... interesting and scary at the same time. Cool info on the turbo chargers feeding 3 cyl each and the injectors are in the head so they're likely to be relatively easy to service?

The bore thing is WAY interesting/scary. Sounds like it can't be bored to rebuild due to the microscopic stuff getting sprayed on the cylinder walls? Makes it essentially a "throwaway" engine? (maybe they have serviceable sleeves?)
Nicasil cylinder coatings in dirt bikes pretty much eliminated boring cylinders. Just slap new pistons in and go. I wonder if this is similar.

EDIT:I type slow.
 

glockman

I hate Jeep trucks
Location
Pleasant Grove
Nicasil cylinder coatings in dirt bikes pretty much eliminated boring cylinders. Just slap new pistons in and go. I wonder if this is similar.
So if a wrist pin or similar comes loose and scores the cylinder wall, is the jug is junk on a motorcycle? Good to hear it's not the upcoming Vega of the 2020's
Yes, I have done exactly that, lost a wrist pin clip and trashed a cylinder.
 

Tonkaman

Well-Known Member
Location
West Jordan
I asked the Ram dealer about this change before I ordered my truck. They said this is only to replace the 5.7 hemi but no plan to replace the 6.4 hemi.
 

Gravy

Ant Anstead of Dirtbikes
Supporting Member
So if a wrist pin or similar comes loose and scores the cylinder wall, is the jug is junk on a motorcycle? Good to hear it's not the upcoming Vega of the 2020's

There are places like Millennium Technologies that replate Nikasil cylinders- they'll even weld gouges- bore them then replate if necessary.

The coating is extremely durable. I've seen a piston smear molten AL on the cylinder wall then I've dissolved it off with muriatic acid and it's still in spec.
 
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