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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.

Recharge Wrap-up: Reverse graffiti powered by Nissan Leaf; BMW introduces Wallbox Pro

BMW has a new, faster version of the Wallbox home EV charger. The Wallbox Pro offers 7.4 kilowatts, and can charge the BMW i3 to 80 percent in under three hours. It features a seven-inch touchscreen and proximity sensor, plus an 11.5-foot cord. The Wallbox Pro can also be used with smart home systems such as lighting and heating. The Wallbox Pro is available in Europe, and will come to the US later in the year. Read more at Hybrid Cars. Nissan is using the Leaf to power the creation of "reverse graffiti" in London. The company has commissioned artist Moose to selectively wash dirt off of a wall outside of a subway station, leaving behind a mural of London landmarks. Moose used a jet washer powered by the Leaf's battery to create the piece. The goal is to highlight the amount of pollution in London and other large cities, which is not a new idea. "It is a reminder that electric vehicles don't have an exhaust to emit the kind of air pollution which has stained the wall Moose has created his piece on," says Nissan's Jean-Pierre Diernaz. See the artwork in the gallery, and read more in the press release below. Local Motors used a 3D printer to make the Strati electric car in 44 hours. The car was printed with 212 layers of carbon-reinforced ABS thermoplastic. After printing, the team then spent two days finishing the car to make it run. It is powered by the drivetrain from a Renault Twizy, and is capable of 40 miles per hour. Now the question is if this sort of small-scale car manufacturing using 3D printing technology will catch on. See how a car gets printed in the time-lapse video below, and read more over at Treehugger. Nissan cleans up London with the world's first car-powered graffiti - Nissan LEAF powers "Reverse Graffiti" street art in Waterloo - Mass-scale mural imagines a cleaner London, without car fumes - The artwork is on show in Waterloo, London near popular Southbank LONDON – Nissan is highlighting London's battle with air quality in the UK by using the 100% electric Nissan LEAF – the world's best-selling electric vehicle (EV) – to power a striking piece of street art in Waterloo, London that depicts the capital's iconic skyline. Nissan commissioned Reverse Graffiti artist Moose – the founder of his field – to create the mass-scale mural, which was unveiled today. Unlike traditional graffiti, Moose creates his art by cleaning dirt off surfaces using a jet washer or wire brush, leaving a striking design in negative on the wall.

NHTSA probing whether to call Nissan to the carpet over Versa unintended acceleration

The Nissan Versa and Versa Note may have a carpeting problem that could make the little cars risky to drive. The National Highway Traffic Safety Administration is launching a preliminary evaluation into the 2012-2014 model year versions of the Versa, Versa Sedan and Versa Note, affecting an estimated 360,000 vehicle. In these vehicles, it's possible that the driver's foot could be caught where the carpet meets a trim panel near the accelerator. The regulator has four reported instances of the issue, but it's still collecting data from Nissan about any further cases.
According to the complaints, the tunnel carpet cover trim panel can possibly snag the drivers' right shoe where it meets the carpet, and can either keep their foot on the accelerator or prevent moving it to the brake pedal. In one case, the problem was bad enough that the driver had to free his foot using his hand, while driving. In two of the four reported cases, the vehicles were rental cars.
This is actually the second ongoing preliminary evaluation for some of these models. In late May, NHTSA started looking into the 2013-2014 Versa and 2014 Versa Note for long brake pedal travel.