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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.

Nissan teases New York-bound 2015 Murano

It was over a month ago when we received reports that Nissan would be unveiling the new Murano at the New York Auto Show next month. Now the Japanese automaker has confirmed its imminent arrival, offering up the brief teaser clip below to give us a very faint idea of what to expect.
In announcing the Murano's upcoming debut in Manhattan, the company described the Murano as "the halo vehicle for Nissan's expanding range of bold crossovers and SUVs," previewing the design that will distinguish a whole range of Nissans to follow.
Short of that, we've got little to go on, but we're expecting to see some traits from the Resonance concept of 2013 Detroit vintage finding their way onto the production version of a vehicle that has always been rather stylized from the start. Something (sales figures, perhaps?) tells us that the oddball CrossCabriolet will get lost along the way, not that we'll mind.

Carlos Ghosn projects Renault-Nissan for #3 position by 2018

As the chief executive of both Renault and Nissan, Carlos Ghosn is one of the most powerful executives in the automotive industry. But at 60, he'll have to retire sooner than later: he's got three and a half years left on his contract at Renault, which mandates retirement by 65. But before his time is up, he intends to leave the Renault-Nissan Alliance among the top three automakers in the world. Currently the combined sales of Nissan, Renault and its various brands (including Dacia, Datsun and Infiniti) make the alliance the fourth largest carmaker globally, trailing behind Toyota, Volkswagen and General Motors, but ahead of Hyundai, Ford, Fiat Chrysler and Honda. But Ghosn sees the alliance's sales (and global market share) increasing in the next three years. Speaking with Automotive News Europe, Ghosn projected confidently that the alliance will hit the number three spot by 2018 – just three years from now. To get there, Ghosn knows that Nissan and Infiniti will need to increase their combined market share to 10 percent in the United States, growing around 2 to 3 percent each year between now and 2018. The challenge is that much more evident in North America where only half of the alliance participates. But it's not all about America. Ghosn also the Chinese market as equally vital to the alliance's success and that of its constituent automakers, projecting continued growth in China for the foreseeable future. He's also banked heavily on the Russian market, which may have dipped now, but in Ghosn's view is bound to recover. News Source: Automotive News - sub. req.Image Credit: Renault-Nissan Alliance Nissan Renault renault-nissan alliance