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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.

Renault wants to merge with Nissan, then go after Fiat Chrysler

The late Sergio Marchionne used to say consolidation would be the only way to compete against the biggest global carmakers. The company looks certain to fulfill that goal, but perhaps not in the way he intended. The Financial Times reports that Renault wants to begin merger talks with Nissan in the next 12 months. Assuming a merger gets completed, the plan is for the combined company to then pursue another merger, with Fiat Chrysler a prime target. Renault, Nissan, and Mitsubishi have been busy since cutting ties with ex-alliance boss Carlos Ghosn. They formed a new alliance board with Renault chairman Jean-Dominique Senard at the helm, Renault has shrunk the size of its board while Nissan added more outside directors, and the two agreed to a new governance structure to ease operational decision making. All three automakers have walked away from Ghosn-era goals to sell 14 million cars and find 10 billion euros in savings by 2022. New strategic plans for all three car companies are in the works. With stability in sight, it's said Senard wants to succeed where Ghosn failed — a full-fledged merger between Renault and Nissan with talks to begin "as soon as possible." Ghosn's pursuit of a merger last year in attempt to make the 20-year-old alliance "irreversible" is part of what led to his downfall, with Nissan executives including CEO Hiroto Saikawa against the push. The new effort is presented as larger scale being the only way for the alliance to take on companies like Volkswagen and Toyota. But the Nissan-Renault-Mitsubishi trio sold 10.76 million cars around the world last year, second to Volkswagen with 10.83 million sales, ahead of Toyota with 10.39 million. If Nissan hadn't suffered a 2.8 percent dip in sales, the alliance would have taken the top spot. If a little scale is good that means more is better, right? Pulling Fiat Chrysler into the alliance would add around 5 million annual sales, and would be another move in Ghosn's footsteps. The former honcho is said to have "held talks with FCA" about some kind of union within the past three years. The French government, which has a 15 percent stake in Renault and double voting rights, shut down the initiative. It's not clear if FCA will be an independent company by the time a potential Nissan-Renault merger closed, though.

Jay Leno checks out Nissan IDx Nismo, spiritual successor to classic Datsun 510

Jay Leno may not be spending his night behind the Tonight Show desk anymore, but he's clearly not done rolling precious metal into his garage, intent on putting it through its paces after a thorough investigation. The latest machine to meet Jay on his home turf is the Nissan IDx Nismo Concept that we first saw at the Tokyo Motor Show late last year.
Leno already has love for the classic Datsun 510, which plays a cameo in the video that you'll see below, and he refers to the IDx as the spiritual successor to that car's ethos - driving fun in an affordable package. Fortunately for us, while the IDx is a showcar first and foremost, it is indeed driveable, and Leno, naturally, takes his turn behind the wheel.
Scroll down to watch the complete video below.