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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 exec talks about smaller Leaf, and maybe a CUV EV as well

The Renault Zoe is a popular electric vehicle in Europe, and it gives buyers on the continent a zero-emissions option that's smaller than the Nissan Leaf. Here in the US, Nissan only offers its one all-electric passenger vehicle, but the company might be taking a page from its corporate partner to offer a smaller Leaf in the near future. According to Gareth Dunsmore, Nissan EV European head, Nissan is thinking about both a smaller EV based on the Zoe and larger, all-electric SUV/CUV. "We've invested $5.4 billion in electric cars such as the Leaf, so we need to ensure we're satisfying as many types of customer as possible," he said. "In Europe, that could mean looking towards B-segment hatches and SUVs or crossovers," according to Auto Express. "If we look towards crossovers or the B-segment for the next car, those could make perfect sense." As for what we actually know about the next-gen Leaf, details are scarce. We did get confirmation that a 200-mile range update is in the works, but information on timing and other details are still something we're waiting for. Let's throw the idea of a smaller Leaf into the rumormill and see when Nissan starts talking. The gallery above shows off the Nissan IDS concept, which was shown at the Tokyo Motor Show last year. Related Video: Featured Gallery Nissan IDS Concept: Tokyo 2015 News Source: Auto ExpressImage Credit: Copyright 2016 Sebastian Blanco / AOL Green Nissan Renault Crossover SUV Electric renault zoe nissan ids

France tries to dodge blame for blowing up FCA-Renault merger deal

PARIS — France sought to fend off a hail of criticism on Thursday after it was blamed for scuppering a $35 billion-plus merger between carmakers Fiat-Chrysler and Renault only 10 days after it was officially announced. Shares in Italian-American FCA and France's Renault fell sharply in early trading after FCA pulled out of talks, saying "the political conditions in France do not currently exist for such a combination to proceed successfully." French finance minister Bruno Le Maire said the government, which has a 15% stake in Renault, had engaged constructively, but had not been prepared to back a deal without the endorsement of Renault's current alliance partner Nissan. Nissan had said it would abstain at a Renault board meeting to vote on the merger proposal. However, a source close to FCA played down the significance of Nissan's stance in the discussions, believing French President Emmanuel Macron was looking for a way out of the deal after coming under pressure at home. Context The FCA-Renault talks were conducted against the backdrop of a French public outcry over 1,044 layoffs at a General Electric factory. The U.S. company had promised to safeguard jobs there when it acquired France's Alstom in 2015. The collapse of the deal, which would have created the world's third-biggest carmaker behind Japan's Toyota and Germany's Volkswagen, revives questions about how both FCA and Renault will meet the challenges of costly investments in electric and self-driving cars on their own. The merger had aimed to achieve 5 billion euros ($5.6 billion) in annual synergies, with FCA gaining access to Renault's and Nissan's superior electric drive technology and the French firm getting a share of FCA's lucrative Jeep and Ram brands. FCA has long been looking for a merger partner, and some analysts say its search for a deal is becoming more urgent as it is ill-prepared for tougher new regulations on emissions. It previously held unsuccessful talks with Peugeot maker PSA Group, in which the French state also owns a stake. French budget minister Gerald Darmanin said the door should not be closed on the possibility of a deal with Renault, adding Paris would be happy to re-examine any new proposal from FCA. "Talks could resume at some time in the future," he told FranceInfo radio.