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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 Qashqai caught looking sleek

The next-generation of the not-for-US-consumption Nissan Qashqai has been out doing some testing in southern Europe this week. And, if the dressed-in-trash-bags look is any indication, it's been doing a lot of roadwork so it can make weight for the big meet the weekend.
Nissan designers haven't been scared to take big design chances with recent new models, so expectations are that the Qashqai crossover will get a bold new visage for its generational changeover. What we see in these photos indicates a sleeker, slightly trimmer CUV however, with no trace of the bug-eyed look we captured recently on a testing Titan.
In the rest of the world, it's a good bet that the Qashqai will be powered by engines ranging from a 1.2-liter turbo up to a 1.6-liter forced-induction unit; that larger one good for something like 215 horsepower. Diesel powerplants will be in the mix, too, for the compact CUV, and word is that Nismo might get its hands on this Rogue cousin for the first time ever.

Meet Sparky, Nissan's Leaf-based, Frontier-bedded EV parts hauler [w/video]

For many enthusiasts, the concept of the ute - a car with a pickup bed - is somehow irresistibly appealing. On paper, it promises the marriage of a truck's utility and a car's superior driving dynamics, and for that reason alone, we'd love to see more of them. Yet while other parts of the world get them in good numbers, North America doesn't ever see them - at least not for long. Based on what we've seen of late, though, that's not due to a lack of motivation on the part of engineers.
BMW wowed us several years ago with an M3 ute, and earlier this year, some interns converted a Mini Paceman into the pickup-bodied Paceman Adventure. Loathe to let their rivals in Munich and Oxford have all the fun, Nissan has built its very own car-based pickup. Meet Sparky, the world's first Leaf Frontier.
Like the M3, this all-electric ute is used as a parts hauler for Nissan's engineering teams at its sprawling Stanfield, AZ tech center and proving grounds.