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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.

Ousted Renault CEO Bollore raised concerns over Ghosn investigation

PARIS — Renault's former chief executive Thierry Bollore, who was ousted in October, had sought to flag alleged conflicts of interest and governance problems at the company's Japanese alliance partner Nissan before his departure, Le Monde reported on Monday. Citing a letter from Oct. 7 addressed to Nissan's board, of which he was member, France's Le Monde newspaper said Bollore had raised questions over the firm's internal investigation surrounding former alliance boss Carlos Ghosn. Nissan and Renault were left reeling by Ghosn's arrest in Tokyo a year ago, on financial misconduct charges which he denies. They have since tried to reboot their strained partnership by revamping their management teams, including by purging them of Ghosn allies and removing people in top jobs at the time of the scandal. Bollore — who took a step up at the French carmaker when Ghosn left even though he was known for his close ties to the alliance founder — was eventually pushed out as Renault's CEO on Oct. 11, days after penning his letter. In comments sent to Reuters, Nissan spokeswoman Azusa Momose denied there were any irregularities in its internal investigation of Ghosn's affairs, and added that the company had reviewed its processes once again following Bollore's letter. "Nissan's independent directors confirmed that the investigation was properly conducted and could be relied on," Momose said. Nissan directors had discussed all the allegations raised by Bollore and the company "concluded that Bollore's concerns were not founded and were based for the most part on inaccurate information and speculation," she added. Bollore said in the letter that he was particularly concerned by the revelation that Nissan had a list of 80 managers implicated in financial dealings similar to the ones attributed to Ghosn. He also raised issues with the chain of command at Nissan, saying some key board members were sometimes kept in the dark on internal matters. Renault, which is still searching for a permanent replacement for Bollore as CEO, had no immediate comment. As well as changing its CEO, Nissan recently demoted senior vice president Hari Nada — a key whistleblower against Ghosn and whose role was also questioned in Bollore's letter — although its internal investigation had found no evidence against the executive. Related Video:

2015 Nissan Murano: Introduction [w/video]

Right as winter turned to spring, a 2015 Nissan Murano was added to the Autoblog long-term test fleet. And while we'd like to report that it's been nothing but smooth sailing, the truth is, as we wrote this, the Murano was undergoing its second stint in the service bay at Suburban Nissan in Troy, MI. It only had 2,400 miles on the odometer. In fact, that's part of the reason why it's taken us so long to introduce this new member of the long-term fleet. After driving the new, third-generation Murano late last year, where we learned that Nissan thinks of its stylish crossover as the flagship for the brand, we decided to order one for a full year's worth of testing at Autoblog HQ. Right from the start, our Murano had problems. At 227 miles, the Check Engine Light illuminated. With no warning messages displayed in the car's onboard infotainment system, we took the Murano to the dealer, where a diagnostic check revealed a faulty O2 sensor. A new part was ordered and we were sent on our way. The Murano went back to the dealer, and now, that issue has been resolved. About 100 miles after the O2 sensor failed, the small storage cover on the center console broke. We aren't really sure how, since this small cubby hasn't had a whole lot of use. Rather than explain it in words, see what's going on in the video below. That's not the only issue we've had with the interior, either. We sort of expected the light, almost white leather to show signs of age during the year-long test, but even after just 2,400 miles, the seats are starting to look worn, with obvious discoloration showing on the driver's seat. What's interesting is, we never had this problem with the light-colored leather on our long-term 2013 Pathfinder. Beyond that, parts of the Murano's interior generally feel poorly put together. The door panels pull away upon light tugging (while closing the door, for example), some of the plastics creak, and we've noticed a few small rattles. Some of this is pretty alarming, especially considering the low mileage of our test car. But it stands to reason that these problems could've been baked in from the start. We're told our car had a couple of issues prior to delivery, and we've heard rumblings from other journalists that their test Muranos haven't been up to snuff. Our early impressions of the Murano were generally positive.