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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 New Micra being considered for Canadian market

A new story from AutoGuide is triggering new speculation that Nissan may be about to bring its New Micra to North America. According to a dealer-based source, Nissan is showing off the overseas hatchback at Canadian dealer meetings along with the redesigned 2014 Rogue. The report indicates that the car is expected to go on sale sometime mid next year. Autoblog has learned that, while the New Micra is indeed under study for the Canadian market, it is not being considered for US sales. Our well-placed source tells us that bringing the New Micra to US dealers "just wouldn't make sense."
Bringing the New Micra to US dealers "just wouldn't make sense."
Reading between the lines a bit, that's because Nissan already has a robust small car lineup spearheaded by the Versa sedan and new Versa Note hatchback, along with the compact Sentra. And while both Versa models are generously sized for the subcompact classes they compete in, their low entry price (the sedan starts under $12k) means that pricing the smaller Micra underneath it would be difficult. Given its historically significantly higher fuel prices (not to mention higher vehicle prices and a penchant for small cars), Canada seems like a much more hospitable market for the Micra.

Nissan: We lose money on each Leaf replacement battery

Nissan has been playing its cards pretty close to its chest when it comes to the production costs for Leaf battery packs. The company recently put a price on replacement batteries for customers at $5,500 plus the requirement to return the old battery. If the decommissioned battery is worth $1,000 to Nissan, as they have stated, that means the battery costs about $6,500 to make, right? Maybe even less if Nissan wants to turn a profit, as automakers are wont to do? Wrong.
Green Car Reports spoke to Nissan about these battery costs, and found that the automaker actually loses money on selling the replacement battery for the Leaf at the current price. Jeff Kuhlman, Nissan's vice president of global communications said, "Nissan makes zero margin on the replacement program. In fact, we subvent every exchange." All you English majors will know that "subvent" is a fancy way to say "subsidize." Kuhlman added, though, "We have yet to sell one battery as part of the program."
The fact that Nissan offers its replacement batteries for less than it costs to manufacture them is telling of a company both cares about what its customer needs and is dedicated to the success of its product. In this case, both of those things encourage people to give up fossil fuels and adopt electric mobility, which is heartening. As more people switch to battery-powered driving, though, battery technology should become better and cheaper, and the scale of production should cause manufacturing costs to decrease. Eventually, Nissan could easily see itself breaking even selling the Leaf battery replacements.