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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.

Facts point to legal violations by Carlos Ghosn, says Nissan external review

YOKOHAMA, Japan — An external committee reviewing governance at Nissan Motor Co said on Wednesday there were enough facts to suspect violations of laws and the private use of company funds by ousted chairman Carlos Ghosn. Following a three-month audit of Nissan's governance after a scandal that shook the global auto industry, the committee put the blame squarely on what it called Ghosn's concentration of power. It also acknowledged Nissan CEO Hiroto Saikawa's role in Ghosn's salary arrangement at the heart of the scandal. Twenty years to the day since French automaker Renault SA agreed to rescue Nissan, the committee described a corporate culture at Nissan "in which no one can make any objections to Mr. Ghosn," who was "in a way deified within Nissan as a savior who had redeemed Nissan from collapse." A representative for Ghosn replied in a statement that the allegations made against the former Nissan chairman "will be revealed for what they are: part of an unsubstantiated smear campaign against Carlos Ghosn to prevent the integration of the Alliance and conceal Nissan's deteriorating performance." The group issued 38 recommendations to bolster Nissan's governance, including that top executive positions at the Japanese car maker should not be held by people serving in executive positions at Renault or junior partner Mitsubishi Motors. It also proposed that the majority of directors, including the chairman of the board, be independent, outside directors and that the role of company chairman be abolished. Responding to the committee's comments, Saikawa told reporters on Thursday that Nissan would seriously consider the committee's recommendations, which he characterized as "tough." Saikawa, who was speaking outside his home, did not specifically address his responsibility in the scandal but has previously said that top management, including himself, were responsible for weak governance which led to the misconduct. The recommendations from the external, seven-member committee came weeks after Nissan and Renault said they would retool their alliance, one of the world's biggest automaking groupings, to break up the all-powerful chairmanship previously held by Ghosn. "There are facts sufficient to suspect violations of laws and regulations, violation of internal rules and private use of company funds and expenses ... by Mr. Ghosn," the committee said in its report.

Roller coaster or racecar, which pulls more Gs?

Looking for a thrill? You're not the only one. You'll find kindred spirits at airfields going up for a skydive, atop bridges and towers with bungees attached to their feet and standing in line for roller coasters at the local amusement park. But you'll also find them in the paddock at the racing circuit.
So what's the commonality? G-force. It's like gravity, only in each of these cases, it's experienced by human invention. But which activity subjects your body to the greatest amount of g-force? That's what Nissan set to find out.
Before putting them back in the cockpit, Nismo sent out two of its young hot-shoes - Jann Mardenborough and Mark Shulzhitskiy - to an amusement park in the UK with a camera and a g-force meter to find out if any of the coasters could produce as much lateral gravitational force as an LMP2 racing car. See what they found in the pair of videos, below.