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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 Juke-R pitted against Bugatti Veyron in brilliantly odd drag race

The Nissan Juke-R must've been a tough car to build a business case for, yet the madcap little crossover with the heart of a GT-R is now a production reality. Admittedly, we should probably assign some quotes around "production," since the vehicle is being built on a one-by-one on-demand basis at extraordinary cost - at an estimated price of well over $600,000, it has little in common with the already bonkers everyday Juke. We're just happy it exists at all.
With 545 horsepower, we also didn't figure it needed more power. But that apparently hasn't stopped the tuning community, which probably only had to adapt performance adders designed for the GT-R to the mechanically similar CUV. Thus, we end up with this mile-long drag race, which pits a Bugatti Veyron against a Juke-R prepared by an outfit called Shpilli Villi Engineering with a claimed 700 horsepower. That's still well down on horsepower versus the legendary quad-turbo supercar, but the much smaller Nissan also figures to be a lot lighter while boasting similar all-wheel-drive traction. We don't have much more information to go on other than this video, and it doesn't appear that both drivers necessarily got their best runs in, but it certainly makes for jaw-dropping watching. Check it out by scrolling below.

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.