2022 Nissan Sentra Sv 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.

Nissan's NY taxi deal faces court obstacles

Nissan scored a big win for itself when the NV200 was named New York City's Taxi of Tomorrow, but the compact van has been under attack ever since. The latest setback for Nissan comes from the New York Supreme Court, which has reportedly ruled the deal between NYC and Nissan is "null, void and unenforceable" since the NV200 is not a hybrid - one of the key parts of NYC Mayor Michael Bloomberg Taxi of Tomorrow plan.
The NV200 Taxi launches this October. Although Nissan says it is bringing a hybrid version of the van to market in 2015, the New York Supreme Court ruled against Nissan, which opens the door for taxi companies in NYC to drive non-Nissan hybrid vehicles. Despite this setback, it doesn't sound like this ruling will affect the NV200 becoming the official taxi of NYC as a part of the 10-year contract worth an estimated $1 billion.

Renault chairman dismisses reports Nissan wants to split from alliance

PARIS — Renault Chairman Jean-Dominique Senard said on Thursday there was a "real desire" within the top ranks of both companies for its alliance with Nissan to succeed, dismissing suggestions the partnership was on the rocks. Turmoil within the Franco-Japanese alliance, long dogged by internal rivalries, deepened following the November 2018 arrest in Tokyo of its architect and long-time boss Carlos Ghosn on charges of financial crimes, which he denies. Attempts to restore calm were dealt a fresh blow by Ghosn's dramatic flight from Japanese justice and a series of no-holds-barred allegations he has made from his refuge in Lebanon, including that he was the victim of a plot to oust him and that the alliance is now a "masquerade". Nissan has vigorously rejected Ghosn's stance, while both the Japanese firm and Renault have tried to rubbish suggestions their two decades old partnership is falling apart. "We have a board overseeing the alliance which is made up of people who are all extremely in favor of the alliance," Renault Chairman Senard told a briefing with reporters. "There is a common desire to associate our strategic plans and a real desire to make this alliance a success," he added, dismissing a report that Nissan was examining scenarios for a possible future outside of the alliance as "fake news." The 66-year-old declined to comment on anything related to Ghosn, adding: "I only think about the future." Renault shares were down 2% by 1123 GMT, underperfoming the broader auto sector which was down on news that Washington has threatened to impose tariffs on European car imports due to Europe's stance on Iran. Renault's French rival and Peugeot maker PSA Group also gave a flavor of some industry headwinds, reporting a 10% fall in its global sales last year as Chinese demand tanked. Renault is due to publish its 2019 global sales on Friday. JOINT PROJECTS Analysts see Renault-Nissan's cost-saving alliance as vital to both companies as the car industry battles a slowdown and huge investments in cleaner vehicles and automated driving, particularly as rivals PSA and Fiat Chrysler are merging to help meet these challenges. Renault held ultimately unsuccessful talks to combine with Fiat Chrysler last year, which Ghosn described at a Beirut news conference as a huge missed opportunity. Senard, who chairs the alliance's operating board, said on Thursday that once the partnership has been rebooted, other firms might potentially want to join.