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Infiniti's new VC-T changes the rules of small turbocharged engines

The upcoming Infiniti QX50 crossover does not get our pulse racing, no matter how shapely the QX Sport Inspiration concept that previews it may be. No midsize SUV does, to be fair. But it has something special under the hood – the world's first production variable-compression-ratio engine. That means the QX50's 2.0-liter turbo four, which makes 268 horsepower and 288 pound-feet of torque, will have up to 27 percent better fuel economy. Here's how it works. The trend of moving to smaller, turbocharged engines carries with it one big falsehood. Under low load when the turbo isn't needed, these engines are less efficient than an equivalent engine without a turbo because of the low compression ratio the turbo requires. That is, if you never need the extra power, you're wasting fuel. Turbocharged (and supercharged) engines use a lower compression ratio to prevent detonation. When you force extra air in a cylinder and mix it with fuel, it's more likely to prematurely go boom. Lowering the compression ratio prevents this problem, but it's less efficient. Infiniti's VC-T promises the best of both worlds, with a compression ratio that ranges from 8.0:1 for high-power turbo needs to a 14.0:1 ratio for fuel-sipping efficiency. At its heart the VC-T engine is a simple idea, but it's complicated to explain. Consider yourself warned. The photo below from Infiniti serves as a good visual overview. For the truly nerdy, this patent application covers the mechanical concept. Instead of having the pistons connected to the crankshaft, Infiniti's engine has a pivot arm with a connection on each end. One end connects to the piston, the other connects to a second lower shaft, which is controlled by an actuator arm. At any given time the engine's pistons move up and down according to the lobes on the crankshaft. But the actuator arm can change the angle of the pivot arm up and down. That is, the pistons still move in the same motion with the same stroke, but phase the entire stroke up or down. Move the pivot up and there's less room at the top, which means a higher compression ratio. Move the pivot down and the compression ratio goes down, too. As an added bonus, the lower shaft eliminates the need for counter-rotating balance shafts. Infiniti says this system works constantly and can vary the compression ratio to any number between 8:1 and 14:1. It also uses electronic variable valve timing on the intake valves to switch into Atkinson-cycle combustion for greater efficiency.

FCA-Renault merger faces tall odds delivering on cost-cutting promises

FRANKFURT/DETROIT — Fiat Chrysler Automobiles and Renault promise huge savings from a mega-merger, but such combinations face tall odds because of the industry's long product cycles and problems translating deal blueprints into real world success, industry veterans told Reuters. BMW's 1994 purchase of Rover, and Daimler's 1998 merger with Chrysler both made sense on paper. The companies promised to hike profits by combining vehicle platforms and engine families. Both combinations proved unworkable in reality, and were unwound. Renault and Nissan, which have been in an alliance since 1999 designed to share vehicle components, have only managed to use common vehicle platforms in 35% of Nissan's products despite an original target of 70%, according to Morgan Stanley. FCA and Renault have raised the stakes for themselves by ruling out plant closures. That increases the pressure to achieve more than $5 billion in promised annual savings from pooling procurement and research investments. The two companies have yet to fill in many of the blanks in the merger plan put forward by Fiat Chrysler. Renault's board is expected to act soon to accept the proposal, but that would lead only to a memorandum of understanding to pursue detailed operational and financial plans. A final deal and the legal combination of the two companies could take months to complete if all goes well. Pressure to cut automotive pollution is driving the latest round of consolidation. Automakers are looking at multibillion-dollar bills to develop electric and hybrid cars and cleaner internal combustion engines. Fiat Chrysler and Renault are betting they can design common electric vehicle systems, then sell more of them through their respective brands and dealer networks, cutting the cost per car. Developing all-new electric vehicles can bring more opportunities to share costs from the outset, industry experts said. "With the emergence of connected, autonomous, electric and shared vehicles, carmakers face immediate investments, so new opportunities for sharing costs have emerged," said Elmar Kades, managing director at Alix Partners. However, most electric vehicles lose money. This is a challenge for city car brands in Europe in particular. Both Renault and Fiat rely heavily on this segment for sales.

Here are your 2016 North American Car and Truck/Utility of the Year finalists [w/polls]

The 2016 Detroit Auto Show will kick off with the announcement of the annual North American Car and Truck/Utility of the Year awards, and the three finalists in each category have just been revealed. Following this announcement, the jury – which includes Autoblog editor-in-chief Mike Austin – will re-evaluate each candidate before casting a final vote for the winner. This year's finalists are: Car of the Year Chevrolet Malibu Honda Civic Mazda MX-5 Miata Truck/Utility of the Year Honda Pilot Nissan Titan XD Volvo XC90 The 23rd annual awards will be announced on the morning of Monday, January 11. For now, we want to know where you stand. Let us know which vehicles you think should win, by voting in the polls below. Chevrolet Honda Mazda Nissan Volvo north american car of the year NACTOY