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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.

FCA inline-six rumored to be real, headed for Jeep Wagoneer

In September, Allpar reported that that clues being dropped at Fiat- Chrysler headquarters, in the carmaker's factories, and on engineer resumes pointed to the development of an inline six-cylinder engine. The site has just proclaimed the rumor is reality, writing that the straight-six, "turbocharged to meet or beat 5.7 Hemi power ratings, with a smoother torque curve, is on the way." The motor's first outing is expected to be either the next-generation Jeep Grand Cherokee, debuting perhaps next year, or the Jeep Wagoneer, debuting in 2020 or 2021. "Tornado" is the purported codename for the power plant said to be just under three liters in displacement, expanding the family begun with the Global Medium Engine 2.0-liter turbo codenamed Hurricane. Engine bay constraints and a long use horizon mean engineers won't simply add two more cylinders to the GME, however. Allpar says the brief is to keep the Tornado GME-T6 — the alphanumeric for "turbocharged six" — no more than three inches longer than the Tigershark 2.4-liter four-cylinder. That means "major design changes" that could include a space-saving head, more closely spaced cylinders, and no cylinder liners. An FCA division called Comau could be called on for its "SmartSpray" plasma lining technology. Allpar muses that the standard version of the engine for Chrysler, Dodge, Jeep, and Ram could get a single twin-scroll turbocharger. Performance trims for Alfa Romeo and Maserati could get different heads and maybe twin turbos, an SRT version might also get both those tweaks. History shows that the Italian versions would make changes to the block, as well. Even so, the Tornado would be less expensive than any Ferrari-supplied V6. A straight-six would put FCA in company with current adopters BMW and Mercedes-Benz, future users like Jaguar, and perhaps Aston Martin. The engine would span the widest range of use cases in the U.S. carmaker's portfolio, though. Potential applications include being a base engine for Ram trucks, serving double duty as a base engine and 5.7-liter Hemi replacement for the Dodge Charger and Challenger, working in the high-end Jeeps, and as a properly hot trim — with Ferrari-designed heads — in the luxury Italian sports cars. The Alfa Romeo Giulia begs for just such motivation to fill the gap between the 280-hp, $42,695 Ti Sport RWD and the 505-hp, $73,700 Giulia Quadrifoglio RWD. And a twin-turbo inline-six in a Maserati Alfieri would stack up nicely with the Germans.

Jeep recalling 75,000 Cherokees over air-conditioning lines

Fiat Chrysler Automobiles has issued a recall for an estimated 75,364 examples of the Jeep Cherokee in the United States. The problem stems from an air-conditioning line, which may have been installed to close to the exhaust manifold. "Under certain operating conditions," says FCA in the statement below, "this may pose a fire risk." Thus far, however, the company says it is "unaware of any related injuries or accidents." The owners of those 75k Jeeps (as well as another 18,000+ in other markets) can expect to hear from their local dealers to have the problem rectified. However the manufacturer also advises owners to watch out for indicators like air-conditioning loss or a dashboard warning light and contact their dealers if necessary. Related Video: Statement: Air-conditioning System October 27, 2015 , Auburn Hills, Mich. - FCA US LLC is voluntarily recalling an estimated 75,364 U.S.-market SUVs to inspect and replace, as required, their air-conditioning lines, as required. FCA US launched an investigation after the National Highway Traffic Safety Administration received two customer complaints involving smoke and fire. The Company discovered air-conditioning lines on some vehicles may have been installed in close proximity to their engines' exhaust manifolds; under certain operating conditions, this may pose a fire risk. FCA US is unaware of any related injuries or accidents. The recall is limited to certain 2015 Jeep Cherokees. Additional vehicles are affected in other markets. They include an estimated 7,571 in Canada; 4,018 in Mexico; and 6,942 outside the outside the NAFTA region. Affected customers will be advised when they may schedule service, which FCA US will provide free of charge. . Customers who observe air-conditioning loss or any other concern, such as a dashboard warning light, should contact their dealers. Customers with additional questions may call the FCA US Customer Information Center at 1-800-853-1403.