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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.

Mercedes, Renault-Nissan to work together on truck project

Just a few weeks ago, Mercedes-Benz barged into the automotive world with news of a pickup as a mysterious but enticing future model from the German brand. Rumors of a possible collaboration with Nissan followed, but Renault-Nissan Alliance CEO Carlos Ghosn refused to give any clear details. That speculation is now over, because the automakers made their truck partnership official. This new information reveals that the Mercedes truck won't be a full in-house creation from Daimler. For example, the pickup will share some of its underpinnings with the latest Nissan NP300 Navara. The German company's engineers, however, will work to change the design to their liking. Also, as in the rendering, Mercedes will use a double-cab body for the model. "Thanks to our well-established partnership with the Renault-Nissan Alliance, we are able to drastically reduce the time and cost to enter this key segment." Daimler Chairman Dr. Dieter Zetsche said in the company's release. Nissan will play a further major role in the project by helping Renault develop a pickup based on the Navara as well. By 2020, all three trucks will be built together in Cordoba, Argentina, for Latin American markets and in Barcelona, Spain, for other parts of the world. Mercedes will target both regular customers and commercial buyers with its truck. While still not officially slated for North America, there's a chance that the Mercedes truck might be sold here. The US arm of the company reportedly has until the end of the year to decide to offer it with some added luxury-oriented upgrades compared to the rest of the world. Daimler & Renault-Nissan Alliance expand cooperation to 1-ton pickup trucks April 07, 2015 Daimler & Renault-Nissan Alliance expand cooperation to 1-ton pickup trucks Nissan and Daimler to jointly develop midsize pickup truck Mercedes-Benz pickup to share some of the architecture with the all-new Nissan NP300 Mercedes-Benz vehicle to be engineered and designed by Daimler to meet specific needs of its customers Mercedes-Benz pickup will target Europe, Australia, South Africa and Latin America Pickup trucks to be built in Barcelona, Spain, and Cordoba, Argentina Latest milestone in the five-year strategic cooperation between Daimler and the Renault-Nissan Alliance STUTTGART/PARIS/YOKOHAMA –The Renault-Nissan Alliance and Daimler AG will expand their five-year strategic cooperation into the pickup truck segment.

Nissan Micra gets fresh new look [w/video]

Nissan has given its popular Micra a substantial refresh. Completely revised fascias front and rear join small sheetmetal tweaks for an all-new look, and Nissan says buyers can expect to find a host of new technology indoors. That includes audio USB and AUX-in slots as well as a new audio and touchscreen navigation system with a larger display. Designers have also graced the model - known in some markets as the Nissan March - with a revised center console and new trim indoors. Be still our beating hearts.
Under the hood, a supercharged, direct-injection 1.2-liter gasoline three-cylinder engine continues to produce 97 horsepower, complete with a stop/start system that Nissan says helps make this powertrain one of the most efficient in the world. Buyers can also opt for diesel and non-supercharged engines if they so choose.
While periodically rumored, Nissan has no plans to bring the model to North America, but with sales in 56 nations and assembly in four different countries, the little Micra remains a big deal worldwide. You can check out an official video and press release below for more information.