2012 Jeep Sahara on 2040-cars

Auto blog

500+ hp Stellantis 'Hurricane' I6 previews a world without Hemis

After years of rumored development, Stellantis has revealed its new six-cylinder engine family. The 3.0-liter, twin-turbocharged "Hurricane" I6 will offer V8 power, forced induction torque and six-cylinder efficiency in a package designed to fit into any of the company's North American rear-wheel-drive platforms.  What is "V8 power," exactly? Well, in standard output guise, the new I6 cranks out more than 400 horsepower (the specific figure will vary by application) and 450 pound-feet of torque, while the high-output variant is good for more than 500 horses and 475 lb-ft. The final figures will be dependent on the application. We'll save you a little legwork: In current Ram, Jeep and Dodge products, the 5.7-liter Hemi tops out at about 395 hp and 410 lb-ft, give or take, and the 6.4-liter around 485 hp and 475 lb-ft.    This is a clean-sheet design that is only related to the company's turbocharged four-cylinder by some common measurements. The I6 is exclusively direct-injection (no hybrid/port-injection here) and the two I6 variants share 96 common parts, including the block and oil pan design. The differences are found in their internals, intake plumbing, valvetrain components and the turbochargers themselves. Stellantis is not yet ready to share specs or supplier info for the turbos but says announcements will come from its partners soon.  The standard-output I6 has a compression ratio of 10.4:1 and revs to 5,800 rpm. It will run on regular fuel, albeit with reduced performance; 91 octane is recommended for maximum output. The high-output variant has a compression ratio of 9.4:1 and will rev to 6,100 rpm. That one will require premium. The new I6's advantages go beyond basic power output. Every Hemi family engine currently in production is based on an iron block design, so they're heavy. The aluminum-block I6 shaves weight off the total engine package, even if some of that gets added back thanks to the turbos and their associated plumbing. The standard-output I6 weighs 430 pounds, Stellantis engineers told us; the high-output adds just another 11. Fully dressed 5.7-liter V8s are in the 550-560-pound ballpark, and 6.4-liters close in on 600 pounds.  You may be wondering, "Why a clean-sheet gasoline engine now, when the industry is moving toward battery-electrics?" A valid inquiry, and one Stellantis was prepared to address. While the company will be pivoting to electrification over the next decade, it won't be instantaneous.

EV cost burden pushing automakers to their limits, says Stellantis' CEO Tavares

DETROIT — Stellantis CEO Carlos Tavares said external pressure on automakers to quickly shift to electric vehicles potentially threatens jobs and vehicle quality as producers struggle with EVs' higher costs. Governments and investors want car manufacturers to speed up the transition to electric vehicles, but the costs are "beyond the limits" of what the auto industry can sustain, Tavares said in an interview at the Reuters Next conference released Wednesday. "What has been decided is to impose on the automotive industry electrification that brings 50% additional costs against a conventional vehicle," he said. "There is no way we can transfer 50% of additional costs to the final consumer because most parts of the middle class will not be able to pay." Automakers could charge higher prices and sell fewer cars, or accept lower profit margins, Tavares said. Those paths both lead to cutbacks. Union leaders in Europe and North America have warned tens of thousands of jobs could be lost. Automakers need time for testing and ensuring that new technology will work, Tavares said. Pushing to speed that process up "is just going to be counter productive. It will lead to quality problems. It will lead to all sorts of problems," he said. Tavares said Stellantis is aiming to avoid cuts by boosting productivity at a pace far faster than industry norm. "Over the next five years we have to digest 10% productivity a year ... in an industry which is used to delivering 2 to 3% productivity" improvement, he said. "The future will tell us who is going to be able to digest this, and who will fail," Tavares said. "We are putting the industry on the limits." Electric vehicle costs are expected to fall, and analysts project that battery electric vehicles and combustion vehicles could reach cost parity during the second half of this decade. Like other automakers that earn profits from combustion vehicles, Stellantis is under pressure from both establishment automakers such as GM, Ford, VW and Hyundai, as well as start-ups such as Tesla and Rivian. The latter electric vehicle companies are far smaller in terms of vehicle sales and employment. But investors have given Tesla and Rivian higher market valuations than the owner of the highly profitable Jeep and Ram brands. That investor pressure is compounded by government policies aimed at cutting greenhouse gas emissions. The European Union, California and other jurisdictions have set goals to end sales of combustion vehicles by 2035.

Watch this 650-hp Hennessey Jeep Grand Cherokee go from 0-60 in 3.9 seconds

Hennessey Performance Engineering has created an HPE650 package for the Jeep Grand Cherokee SRT fitted with the 6.4-liter Hemi engine. When it leaves the showroom floor it has 470 horsepower and gets from 0-60 miles per hour in 4.8 seconds. When it leaves Hennessey's garage floor after the upgrade it has 650 horsepower - 530 hp at the wheels, according to Hennessey - and gets to 60 mph in 3.9 seconds on its way to running the quarter-mile in 12.6 seconds.
There's more than just a Roots-type supercharger bolt-on, with ported cylinder heads and high-flow headers among the many changes made to the engine. You can watch this pre-2014 facelift silver model prove its spec sheet on the drag strip in the video below.