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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.

Renault and Nissan forge deeper alliance

If the automotive industry's current era could be summarized by one trend - from a corporate aspect, anyway - surely it would be conglomeration. But of all the major auto groups that have emerged over the past several years, none have kept themselves at arm's length quite like the Renault-Nissan Alliance.
Much like Fiat and Chrysler, Renault and Nissan are presided over by a common chief executive. But whereas Sergio Marchionne's Italian-American alliance has moved swiftly from a transatlantic partnership to a merged company in the span of less than five years, Carlos Ghosn's Franco-Japanese alliance has stood oceans apart since 1999. But now the Renault-Nissan Alliance is following the lead set by Fiat Chrysler Automobiles in bridging that distance through several key measures.
For one, Renault and Nissan will make increased use of common platforms, R&D, systems and testing. The two automakers will also cooperate more closely on manufacturing and supply chain management, purchasing and human resources. To manage the increased cooperation, the alliance has appointed several new executive vice presidents from within its ow ranks and a new management committee to be chaired by Ghosn, details about which you can read in the press release below.

Nissan backing off IDx, BladeGlider and Infiniti Eau Rouge amid focus shift

Nissan and Infiniti are officially under the microscope after their presentations at the 2015 Detroit Auto Show focused on the new Titan pickup and Q60 Concept, but lacked any and all mention of allegedly production-bound examples of the Q50 Eau Rouge, IDx and BladeGlider EV concepts. Automotive News reports that the lack of info on the three concept cars, which had previously heralded a more performance-minded Nissan/Infiniti, has signaled a shift in priorities at the Japanese company. Instead of driver-oriented models, emphasis is seemingly being focused more on volume offerings. Nissan was subject to a pair of high-level executive departures last year, with both Andy Palmer and Johan de Nysschen departing for Aston Martin and Cadillac, respectively. Both execs were strong proponents of more driver-oriented offerings, with Palmer championing the compact, rear-drive IDx coupe and de Nysschen backing the high-performance Q50 Eau Rouge. While Palmer has been mum on his former employer's alleged move away from performance, de Nysschen made headlines last month after calling out a Nissan vice president in a Facebook post saying he "heard a rumor that Noboru Tateishi is going to cop-out and shelve the Eau Rouge project now that I'm not there to pressure him," while adding that the VP has "more enthusiasm for 'driver's aid's,' apparently, than 'driver's cars.'" AN reached out to Infiniti, with North American VP Michael Bartsch telling the publication that no decision had been reached about the Eau Rouge and that the company was more focused on rebuilding its core portfolio. Featured Gallery Nissan IDx Nismo View 34 Photos Related Gallery Infiniti Q50 Eau Rouge Concept View 24 Photos Related Gallery Nissan BladeGlider Concept View 22 Photos News Source: Automotive News - sub. req.Image Credit: Nissan, Infiniti Rumormill Infiniti Nissan Coupe Luxury Performance Sedan infiniti q50 infiniti q50 eau rouge nissan bladeglider concept