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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 Canada to end Versa sales with Micra launch

There's plenty of space in Canada. In fact, with the second largest land mass of any country in the world, Canada has a population density of just nine people per square mile. But apparently there isn't enough room for more than one cheap Nissan in the True North, Strong and Free.
As you may recall, Nissan Canada recently announced it would begin offering the Micra hatchback with a starting price of less than ten thousand Canadian dollars - significantly less than the nearly $12k it charges for the Versa sedan. As a result, Nissan will reportedly cease offering the Versa sedan in new home of the olympic gold medal for hockey.
Apparently the Versa was a slow seller in Canada, a country in which European tastes tend to prevail - particularly in the Eastern provinces - more than they do in the United States to the south. Nissan evidently hopes that the Micra (a model created principally for the European market) will do better than the American-centric Versa ever did there. According to sales numbers cited by Automotive News, Nissan sold barely more than 12,000 Versa sedans and hatchbacks in Canada last year, but over 117,000 in the United States.

Nissan pokes fun at Tesla's New Jersey woes, then deletes Tweet

Ever have one of those moments when you release something out onto Twitter, only to think better of it a little while later and reach for that garbage can icon? If so, you are not alone. In fact, you're in the company of a certain Japanese automaker, who recently joined the ranks of those who've suffered an embarrassing bout of tweetus deletus. The Nissan Leaf social media team apparently thought it would be amusing to take a light poke at Tesla Motors and its New Jersey dealer fight woes on its Twitter feed and put together the cheeky graphic which you see above. It was originally published on the micro-blogging network accompanied by the text, "It's okay #NewJersey, you can still #GoElectric with the #NissanLEAF #EV." Funny, right? Not to everyone. The image attracted a bit of mild criticism which, to their credit, Nissan responded to saying, "It's all in #EV love." Soon, however, the original image disappeared from the @NissanLEAF feed. Luckily, we saved a copy for your edification. Rob Robinson, senior specialist of social communications for Nissan, told AutoblogGreen that the Leaf Twitter account is run by an agency, and that the tweet in question, "Was not a tweet that was reviewed or approved by Nissan. We saw it and asked them to take it down." As for the reasoning, Robinson said that, "We thought it was a discussion we didn't need to be weighing in on." While we can see the Nissan point of view, we also appreciate the attempt at being irreverent. Anything to break up the monotony of the stale toast the account usually offers up – "What would you nickname your Nissan Leaf if it was Ocean Blue?" which is the last undeleted Tweet available on the feed, as of this writing. We actually applaud the intention of the Tesla post. It all makes us wonder, though, if the social media team over there isn't in need of a little input on how they might improve its outreach. Since we know our readers are not shy in offering suggestions, we ask you to leave your thoughts and ideas for them in the Comments.