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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 Leaf EVs slip through French village to make a quiet point

Bjork's 1995 freak-out hit It's Oh So Quiet may have reflected the singer's oddball Icelandic sensibilities, but Nissan is making the concept of relative silence a French thing. The Japanese automaker recently promoted its all-electric Leaf by staging a mini-rally through what it called "one of the quietest villages in Europe." And with the exception of a couple damaged trash bins and a destroyed rear-view mirror from an old-school archway, the race kept the drivers wide awake but everyone in the Southern French village in Provence Alpes Cote d'Azur sleeping. Nissan sent four vehicles on a five-kilometer jaunt through the village in the wee morning hours. Screeching tires and a couple booms notwithstanding, the company said everyone in town stayed snoozing. There was a broader purpose to this exercise, of course, which Nissan blatantly admits was a stunt. Nissan was helping celebrate 19th Annual International Noise Awareness Day (INAD), which took place on Wednesday and highlighted the emotional and health issues as well as high blood pressure and insomnia caused by excessive exposure to noise. Check out Nissan's press release below, where you'll also find the video. This content is hosted by a third party. To view it, please update your privacy preferences. Manage Settings. NISSAN LEAF CELEBRATES INTERNATIONAL NOISE AWARENESS DAY WITH A NIGHTTIME "SILENT RIDE" ROLLE, Switzerland – To mark the 19th annual International Noise Awareness Day (INAD), Nissan has taken to the streets of one of Europe's quietest villages during the middle of the night with a silent "ride" of its 100 percent electric Nissan LEAF. The activity, complete with a start and finish line in Provence Alpes Cote d'Azur, was designed to demonstrate the noise reduction levels of the Zero Emissions car compared to traditional combustion engines. The World Health Organization (WHO) states at least 13.5 percent of Europeans are exposed to road traffic noise at levels exceeding 55 dB, which is considered detrimental to human health*. The medical effects of noise levels include insomnia (50dB), obesity (50dB), psychic disorders (60dB) and reduction in life expectancy (50dB)*. As a result, Nissan has filmed a 'silent ride' to help support INAD in raising awareness about noise pollution levels across Europe.

Nissan, least profitable Japanese automaker in Q3, stays strong on EVs

Nissan had some not-so-good financial news to report today. Despite a 57-percent net income increase, Nissan was Japan's least-profitable carmaker for the third quarter of last year. A weak yen helped put the company's operating profit below the estimates of financial analysts. In a speech on the financial situation, Nissan corporate vice president Joji Tagawa said "These results, however, do not reflect the full potential of Nissan." Given our focus on expensive electric vehicles, among other things, we wondered how this might affect EVs. One of the financial analysts told Bloomberg that the news is a "crisis" at the company, but the official word is that things are steady as she goes on the EV front. In his speech, Tagawa reaffirmed the company's strong belief in plug-in vehicles, saying that "Nissan's EV strategy will accelerate with the launch in fiscal 2014 of the e-NV200, the second all-electric model available globally." That electric van has the potential "to transform emissions among commercial vehicles" and Nissan remains interested in initiatives such as EV carsharing in Japan and the continued deployment of charging infrastructure. The speech transcript is available below. In a statement to AutoblogGreen, Billy Hayes, Nissan's vice president and program director, said that, "Nissan considers zero emission vehicles to be the ultimate solution for realizing sustainable mobility in the future and is strongly committed to EV technologies. Nissan's investment in Leaf and EV technology is positive for the company's business results over the lifecycle, and accelerating sales of Leaf only help to build economies of scale and improve the business model for the technology further." FY13 3Q financial results Nissan Motor Co., Ltd. Joji Tagawa, Corporate Vice President Introduction For the nine-month period, Nissan has made solid progress to improve its business performance. The pro forma nine-month financial results, and particularly those of the third quarter, are up compared to the same period last year, despite intense competition and uncertain economic conditions. These results, however, do not reflect the full potential of Nissan. Looking ahead to the quarter ending March 31, 2014, we expect to continue to improve our business results and as such, we are maintaining our prior profit outlook for the fiscal year.