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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.

As of today, Nissan has sold 50,000 Leafs in the US, 115,000 globally

Watch out, America, there are 50,000 Nissan Leaf electric vehicles prowling your streets. That's the official word from Nissan, which says it has just delivered the 50,000th Leaf – a black SL model – to Todd and Lisa Bolt in Dallas, Texas. Todd is a pastor at the Gateway Church in Southlake, where there almost two dozen Leaf drivers who call themselves the "Blessed LEAFs Club." We're not making that up. Divinely inspired or not, Todd said in a statement that the EV completely meets the family's needs and that, "I don't know why we'd buy another gas car." Last September, Nissan announced it had sold 35,000 Leaf EVs in the US so far, and the 25,000 mark came in May last year. Globally, "nearly 115,000" Leafs have been sold, which makes Nissan's workhorse the most popular EV by a long shot. To celebrate the occasion, Nissan has put together an infographic (click to enlarge) showing the cumulative effects of all those electric vehicles on the roads. While they're only estimates based on taking the actual data from the CarWings connected vehicles (which make up 55 percent of the total fleet) and extrapolating, the numbers are still impressive. Around 906,000,000 miles driven, which means 241,000 metric tons of CO2 saved from going into the air. 50,000 Leaf sales is a big deal, sure, but we're much more keen on those cleaner air figures. Read more below. This content is hosted by a third party. To view it, please update your privacy preferences. Manage Settings. NISSAN DELIVERS 50,000TH ALL-ELECTRIC LEAF IN U.S. TO TEXAS FAMILY DALLAS (May 23, 2014) -- Nissan, the global leader in electric vehicle (EV) sales, achieved another milestone this month as Dallas residents Todd and Lisa Bolt made Nissan LEAF the first all-electric model to hit 50,000 sales in the U.S. The Bolt family took delivery of their black LEAF SL earlier this month at AutoNation Nissan of Lewisville. Thanks to enthusiastic owner advocates, robust public charging infrastructure and the launch of a successful free charging promotion, Dallas – and the state of Texas – have become hot growth markets for LEAF. So far in 2014, LEAF sales in the Dallas-Fort Worth metroplex have grown by about 50 percent over the previous year, with that growth set to accelerate faster thanks in part to the introduction of a new state tax rebate of up to $2,500 on the purchase or lease of a new Nissan LEAF.

Nissan working on bringing bizarro BladeGlider to dealerships?

It's a rare thing for pie-in-the-sky concepts to make production relatively unmolested. Edges are usually softened, mirrors made bigger and wheels shrunken into something that will be less backbreaking and easier to see out of on public roads. And while the essence of many concepts can still find their way into production, the wackier parts found in their concept forms often end up as nothing more than flights of fancy.
That makes news of the strange Nissan BladeGlider being considered for production rather interesting. You'll recall that the BladeGlider Concept debuted in November at the 2013 Tokyo Motor Show, featuring a McLaren-esque three-seat V layout, an electric drivetrain and a narrow front track like the DeltaWing and ZEOD RC. Understandably, perhaps, Nissan has been touting it as "reinventing the performance car." Everything about it screamed "concept."
Now comes word from Car in the UK that the car may actually make it to production. Quoting Nissan vice president Andy Palmer, "It's in our mid-term plan." "Our intention is to do it," he says. Now, Palmer has plenty of sway, but this should hardly be taken as an absolute confirmation that the triangle-shaped car would be coming. It is, however, a very promising sign. Palmer evidently sees the BladeGlider as a way to cajole young people into becoming car enthusiasts, which suggests Nissan might try to make it inexpensive. Alternatively, the BladeGlider could form the basis of a small-volume racecar, but it isn't clear what racing organization would have it.