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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.

Carlos Ghosn's arrest casts doubt on future of Renault-Nissan alliance

For years, France's Renault and Japan's Nissan struggled to make money in the global auto business. Then came Carlos Ghosn, a Renault executive who helped to orchestrate an unprecedented transcontinental alliance, combining parts of both companies to share engineering and technology costs. Now Ghosn's arrest in Japan for alleged financial improprieties at Nissan could put the nearly 20-year-old alliance in jeopardy. Ghosn, 64, born in Brazil, schooled in France and of Lebanese heritage, is set to be ousted this week from his spot as Nissan chairman. He could also lose his roles as CEO and chairman of Renault, threatening the alliance formed in 1999 that's now selling more than 10 million automobiles a year. He's been "the glue that holds Renault and Nissan together," Bernstein analyst Max Warburton wrote in a note to investors. "It is hard not to conclude that there may be a gulf opening up between Renault and Nissan." In fact, Nissan's investigation into alleged misconduct by Ghosn is expanding to include Renault-Nissan finances, sources told Reuters — in a further sign that Nissan may seek to loosen its French parent's hold on their global carmaking alliance. Nissan told Renault's board on Monday it had evidence of potential wrongdoing at Renault-Nissan BV, the Dutch venture overseeing alliance operations under Renault's ultimate control, three people with knowledge of the matter said. Renault's board planned to meet Tuesday to discuss Ghosn's fate. "Carlos Ghosn is no longer in a position where he is capable of leading Renault," French Finance Minister Bruno Le Maire told France Info radio, calling on Renault's board to meet "in the coming hours" to set up an interim management structure. The French government owns 15 percent in Renault and has a say in its operations. Nissan's board is to meet Thursday to consider Ghosn's fate. Nissan has said it will dismiss Ghosn after he was arrested for allegedly abusing company funds and misreporting his income. That opens up a leadership void at the entire alliance, for which Ghosn officially still serves as CEO and chairman. Ghosn added Mitsubishi to the alliance two years ago after the tiny automaker was caught in a gas-mileage cheating scandal. Renault owns 43.4 percent of Nissan, which owns 15 percent of Renault, with no voting rights in a partnership that began in 1999. Since 2016, Nissan has held a 34 percent controlling stake in Mitsubishi Motor Corp.

Infiniti is pulling out of Western Europe, cutting models

BEIJING — Nissan's premium brand Infiniti has announced it will exit Western Europe early next year, as it restructures its global operations and focuses on the world's top two auto markets. Infiniti said it will discontinue the Q30 sedan and the QX30 sport-utility vehicle and cease their production by the middle of 2019 at Nissan's manufacturing factory in Sunderland, England. Both models are sold globally but produced only in Britain. The QX30 is sold in the United States. The move comes as Infiniti seeks to divert its resources to markets with bigger opportunities, such as China and the United States, from a region where non-European premium brands are struggling to compete against local players such as Audi, BMW and Mercedes-Benz. Nissan also recently scrapped plans to build its new X-Trail SUV in Britain amid the uncertainty surrounding Brexit, saying it had taken the decision to optimize its investments by building the next generation model in Japan. "Western Europe remains the most challenging and competitive region for premium cars," Infiniti's chief spokesman, Trevor Hale, told Reuters. Infiniti's sales in western Europe almost halved last year to 5,800 vehicles. In addition to the tough competition, the Japanese premium brand, headquartered in Hong Kong since 2012, has struggled to effectively meet emissions and other regulatory requirements in the region, Hale said, referring to stringent Euro 6 emissions requirements and other regulatory challenges. "The commercial reality for Infiniti in Western Europe is that there is simply no visibility of a viable and sustainable business, especially given the regulatory challenges," he said. Infiniti said an exit from Western Europe will allow it to focus on its initiative to electrify a good portion of its product portfolio from 2021 and discontinue diesel offerings. The brand plans to focus more on its SUV lineup in North America, bring five new or significantly-redesigned vehicles to China over the next five years, improve quality of sales and residual value and realize more synergies with Nissan. "This is all part of Infiniti's vision to become a top challenger brand in the premium segment," it said. As it prepares to withdraw from Western Europe, Infiniti said it is working to find alternative opportunities for employees who would be affected, consulting with employee representatives where necessary and identifying opportunities for transition and training support where appropriate.