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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 CEO plans to deliver 'raw details of the misconduct' to Renault

TOKYO/PARIS — Nissan Motor's CEO plans to meet one-on-one with the deputy CEO of automaking partner Renault in Amsterdam this week, sources told Reuters, amid tensions over the future of the alliance after Chairman Carlos Ghosn's arrest last month. The meeting would be the first face-to-face interaction between Nissan's Hiroto Saikawa and Renault's Thierry Bollore since Ghosn was arrested on Nov. 19 in Tokyo. It would take place alongside regular top-level, monthly talks between the partners and Mitsubishi Motor Corp that will be held over two days from Tuesday, according to one of the sources familiar with the matter. Saikawa, who took over from Ghosn as CEO last year, is planning to discuss at the meeting with Bollore possible changes to the partnership's management and operations with an eye to continuing the alliance, another source who is close to Nissan's management said. The talks in Amsterdam could provide Saikawa with an opportunity to try and convince Renault executives of the gravity of Ghosn's alleged misconduct discovered during an in-house investigation by the Japanese automaker. They are being held a day after Saikawa rebuffed a demand from Renault for an extraordinary shareholder meeting that would have offered the French car maker a chance to weigh in on Ghosn's replacement as chairman and on other Nissan board appointments. Mitsubishi Chairman Osamu Masuko said late on Monday he will attend the Amsterdam meetings via video conference. A Nissan spokesman said Saikawa would attend meetings with alliance partners in Amsterdam from Tuesday, but declined to comment on the possibility of the one-on-one meeting with Bollore. Ghosn was charged last week alongside alleged accomplice Greg Kelly and Nissan itself over the company's failure to declare $43 million in deferred income that Ghosn had arranged to be paid while chairman and CEO. Both men remain in custody. The scandal has shaken the Renault-Nissan-Mitsubishi alliance, with Saikawa calling for changes to weaken Renault's control as he moved to oust Ghosn in the week of his arrest. Renault directors were briefed last week on the Nissan investigation that led to Ghosn's arrest but reiterated their earlier decision to keep him in office as chairman and CEO. But the Renault board has yet to be given direct access to Nissan's findings, which are being closely held by Renault lawyers answering to Ghosn's long-standing chief of staff and head of legal affairs at Renault, Mouna Sepehri.

Datsun previews new budget sedan for Russia [w/video]

Nobody does cars on the cheap quite like the Renault-Nissan Alliance. The former part of the equation already has its Dacia brand of cost-effective, no-frills vehicles that have become a favorite of Top Gear co-host James May, and last summer, the latter revived its Datsun nameplate for a budget brand of its own.
The reborn Datsun launched in India this past July with its Go hatchback, returned in September with the Go+ minivan and revealed the Redi-Go concept just last month. And now it's given us our first look at an upcoming budget sedan developed specifically for the Russian market.
The as-yet unnamed vehicle (which we'll bet will incorporate the word "go" into its nameplate somehow) is set to debut on April 4, where it will launch the Datsun brand in Russia. Few details are available at this point, but the low-cost sedan was designed in Japan to offer Russian drivers "an engaging driving experience, peace of mind ownership and accessibility at the right and transparent price, with a competitive Total Cost of Ownership."