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Nissan Leaf, Chevy Volt have best sales month of 2015

Things are trending upwards for the two best-selling plug-in vehicles in the US. Both the Chevy Volt and the Nissan Leaf had their best sales month of 2015 in May, with the Volt selling 1,618 units and the Leaf moving 2,104. The upward swings come at an interesting time, with lots of excess first-gen Volts waiting for buyers and some buyers already ordering their second-gen Volts. So far in 2015, the Leaf has outsold the Volt 7,742 to 4,397. While 7,700 Leafs is respectable, it's nowhere near the numbers that Nissan will have to hit to reach the 50,000 annual sales that CEO Carlos Ghosn says is possible in the US. Still, the Leaf had its best sales month since December 2014 (when it sold 3,102 units) in May, but last month was still down 32.5 percent compared to May 2014. Despite the smaller overall number, May represents a big positive for Chevy, which has seen sluggish sales for the Volt for a long while now. The 1,618 Volts sold last month are only 3.9 percent lower than the 1,684 sold in May 2014 and May 2015 was the best month for Volt sales since August 2014. Perhaps salesmen are ready to make deals, what with thousands sitting around on dealer lots right now. The next-gen Volt is due this fall, and the order books (in California, at least) opened up this week. Like every month, our full wrap-up of green car sales in the US is coming soon (the VW e-Golf, for example, hit a best-ever high of 410 sales). Until then, feel free to discuss the Volt and Leaf sales figures in the Comments. Green Chevrolet Nissan Electric Hybrid ev sales hybrid sales

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'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.