2012 Nissan Versa on 2040-cars

Auto blog

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.

Ghosn: Nissan-Renault strife and his arrest can be traced back to Macron

PARIS — Ex-Nissan boss Carlos Ghosn said on Wednesday that a surprise corporate move, orchestrated five years ago by French President Emmanuel Macron, who was then economy minister, soured relations between Renault and Nissan and contributed to his ouster. Ghosn, the former head of the car alliance, said Nissan executives and Japanese officials were shocked by a 2015 decision by the French government to increase its voting rights at Renault. "This left a big bitterness. Not only with the management of Nissan, but also the government of Japan," Ghosn told reporters, although he did not name Macron. "And this is where the problem started." Macron's office did not respond to a request for comment. In April 2015, as a 37-year-old minister with then-unknown presidential ambitions, Macron ordered a surprise increase in the state's stake in Renault designed to secure double voting rights. The overnight move gave the French state a blocking minority in Renault, which in turn controlled Nissan via its 43.4 percent stake in the Japanese firm. According to French and Japanese sources, that rattled the Japanese side of the Renault-Nissan alliance, which feared a national champion was falling under the control of the French government. In the ensuing eight-month boardroom fight between Macron's ministry and Hiroto Saikawa — Nissan's second-in-command at the time — Ghosn sees the seeds of what he says grew into a conspiracy to have him arrested and oust him from control of Nissan. The 65-year-old fled Japan last month as he awaited trial on charges of under-reporting earnings, breach of trust and misappropriation of company funds, all of which he denies. He is now in Lebanon, where he spoke to international media on Wednesday. "There started to be some kind of defiance from our Japanese colleagues, not only about the alliance but also about me," Ghosn told reporters. "And some of our Japanese friends thought: The only way to get rid of the influence of Renault on Nissan is to get rid of him," he added. "Unfortunately, they were right." Following Ghosn's arrest in November 2018, Nissan executives said that said governance had been eroded by RenaultÂ’s control.

Hyundai plots a Nissan Juke fighter

A few years ago, Hyundai Motor America CEO Dave Zuchowski suggested interest in taking on the Nissan Juke with a subcompact crossover. It looks like that project is coming together, as we caught Hyundai testing a small, curiously-styled SUV in Germany recently. The SUV is expected to share a lot of the same chassis components as the i20, a hatchback that's sold in other parts of the world, with the same engine lineup as the new i30, another hatchback that Hyundai doesn't sell in the America. In the United Kingdom, the i30 is available with engines including a 1.4-liter gasoline and a 1.6-liter diesel unit. Front-wheel drive would be standard with all-wheel drive an option. The heavily-camouflaged prototype doesn't give away a lot of the SUV's design. The front of the vehicle is hidden away, but what we can see the grille features hexagonal shapes instead of the horizontal bars that we've become accustomed to seeing in Hyundais. The headlights mimic the Jeep Cherokee's design with thin slits on top and larger, round units toward the bottom. At the back, camouflage hides the majority of the prototype, but the taillights appear to be different than the rest of Hyundai's offerings. The outline of the taillights resembles the same units found on the Intrado Concept, indicating the vehicle will get some design cues from the hydrogen-powered prototype. A single exhaust outlet protrudes underneath the rear end. The overall profile of the SUV appears to be smaller than the Tucson, which is currently Hyundai's smallest crossover in the US. Related Video: Featured Gallery Hyundai SUV Spy Shots View 10 Photos Image Credit: CarPix Design/Style Spy Photos Hyundai Nissan Crossover SUV Future Vehicles