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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 scion John Elkann tries to pull off a Marchionne-sized merger

MILAN, Italy — When John Elkann lost his ally last year with the sudden death of Sergio Marchionne, some questioned whether the softly-spoken scion of the Agnelli clan would be able to emerge from his shadow to ensure Fiat Chrysler's future. But New York-born Elkann, who became Fiat chairman in 2010, acted decisively to fill the vacuum left by the larger-than-life Marchionne and get closer to the big merger deal the legendary executive was unable to deliver. At just 28, Elkann was thrust into the role of Fiat vice chairman after the deaths of his grandfather and great-uncle "because there was really nobody else" to take the wheel. For Elkann, who got his first taste of the car industry as an intern at a factory producing headlights in Birmingham, England, the first 18 months with responsibility for the family-owned carmaker and its long heritage were "terrible." But from that low point, Elkann, 43, is now trying to merge Fiat Chrysler (FCA) with French rival Renault to form the world's third largest carmaker and tackle new challenges facing the industry. Elkann will become chairman of the merged FCA-Renault if the deal goes ahead, ensuring the Agnelli dynasty plays a central role in the next chapter of automotive history. At an event in Milan on Monday, the usually-shy Elkann looked happy and confident. His first big break came with an instrumental role in persuading Marchionne, who was running one of the businesses owned by the Agnelli family, to become chief executive in 2004 and give Fiat "a new start," Elkann said in a "Masters of Scale" podcast last year. Fiat was at the time almost on the brink of collapse. This involved a "very long night ... and many grappas" but proved to be a turning point in the fortunes of the Italian company founded by Elkann's great-great-grandfather Giovanni Agnelli, which built its first car in 1899. In 2005, Elkann backed Marchionne in negotiating the breakup of an alliance Fiat had entered into with General Motors in 2000, receiving $2 billion from GM in return for canceling a deal that could have required GM to buy the remainder of Fiat Auto. Marchionne then used GM's money to fund a turnaround at Fiat, which involved taking the Italian carmaker into a transformation alliance and then full-blown merger with U.S. automaker Chrysler as Elkann agreed to the Agnellis loosening their grip.

Nissan EV design is diverging in three directions

As the movie awards season kicks into high gear, Nissan design chief Shiro Nakamura appears to be implying that his company's electric-vehicle design prospects are about to go from Philomena into The Wolf of Wall Street territory. Nakamura, speaking with Motor Authority at the Detroit Auto Show last week, allowed that the design of the five-seat Nissan Leaf is fairly conservative and will remain so given that the model continues to be the most practically-minded EV from the company. In the near future, though, Nissan is planning to head in different directions. Specifically, an all-electric sports car and a two-seat commuter vehicle that could come with in-wheel electric motors that will allow the designs to get more radical. How radical? Well, we've heard Nissan may bring the BladeGlider concept (pictured) it unveiled at the Tokyo Motor Show late last year to production. It has a narrow front and wider rear and a 1+2 seating arrangement. Beyond that, Nissan has the two-seat Esflow concept vehicle it showed off in 2011 that could provide some hints, since it's expected that some of the design components from that car will be worked into the upcoming production models.