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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 pickup on Twitter [w/video]

Nissan is celebrating 80 years of building pickup trucks by teasing its latest one on Twitter ahead of a June 11 reveal. Official information about the new vehicle is essentially nonexistent at the moment, but there are some clues to extrapolate from.
There's a special member of the #Nissan family on the way. Due date: June 11th. pic.twitter.com/OkQ0GkXypV

- Nissan (@Nissan) June 2, 2014

Apple iTunes Radio picks Nissan as first automotive launch partner

With the launch of iOS 7 last week, those who carry around a certain fruit-branded cellphone got access to a new technology called iTunes Radio. Apple's delayed entry into a market currently dominated by service such as Spotify and Pandora, iTunes Radio allows users to create their own stations or to choose from a number of featured stations. From there, listeners can fine tune their results to deliver more popular songs or newer, deeper tracks. Each song is linked back to the iTunes store, allowing users to easily buy songs they fall in love with.
Now, Nissan has teamed with Apple as the exclusive launch partner for iTunes Radio. This partnership means you'll be seeing some Nissan-specific content when you're surfing through iTunes Radio, with some subtler stuff in the form of material and some not-so-subtle approaches, like Nissan's use of iAd, a system that allows developers to directly insert advertisements into apps. The focus at first will be on the upcoming Rogue, the redesigned Versa Note and the Leaf EV.
Nissan's vice president of marketing in North America, Jon Brancheau, explained the team up, saying, "We see iTunes Radio as an integral part of our new vehicle launches and 'big moments,' riding the wave of interest and usage of this exciting new service to maximize exposure of Nissan's new models." Take a look below for the rundown from Nissan.