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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.

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

Why a Renault-FCA merger could be good news for Nissan, Mitsubishi

TOKYO — Nissan's advanced technologies including platforms and electric powertrains could give it leverage in a merger involving Renault and Fiat Chrysler, thanks to a royalty system it has with the former, two people with knowledge of the matter said. A merged Renault-Fiat Chrysler could face an extra hurdle each time it uses technology developed by Nissan or Mitsubishi Motors, while the two Japanese automakers stand to gain a client in Fiat Chrysler (FCA), one of the people said. Both sources declined to be identified because of the sensitivity of the matter. Nissan's technology, particularly in electrification and emissions reduction, could give it some sway in the $35 billion potential tie-up between Renault and FCA, even as its stake in the newly formed company would be diluted. Currently Renault SA pays less for technology developed by Nissan than the Japanese automaker pays for French technology, a third person said. This has long been a sticking point for Nissan, and an area where Nissan could seek more favorable terms. "Whenever Nissan transfers platform, powertrain or other technology to Renault, there is a margin or royalty which Renault has to pay for use of that tech," one of the people said. "In that sense, FCA, if everything went well, would become another 'client' of ours and that's good. More business for us." A Nissan spokesman declined to comment on its royalty system. The potential Renault-FCA deal has complicated the Japanese automaker's already uneasy alliance with Renault. A further deal with Fiat Chrysler looks likely at least in the near term to weaken Nissan's influence in the 20-year-old partnership. Renault owns a 43.4% stake in Nissan and is its top shareholder. Nissan holds a 15% non-voting stake in Renault and would see that diluted to 7.5% after the FCA deal, albeit with voting rights. The imbalance between the two has long rankled Nissan, which is by far the larger company. Alliance imbalance Renault had previously angled for a merger with Nissan but has been rebuffed by CEO Hiroto Saikawa. Securing benefits from the merger deal will be important for Saikawa, who is grappling with poor financial performance while he struggles to right the company after the ouster of former chairman Carlos Ghosn last year.