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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.

This new Renault would make a great Nissan Maxima wagon

A new Renault station wagon wouldn't ordinarily show up on our radar. But this one gets us thinking. It's the new Talisman Estate, and we can't help but wonder if it wouldn't make a good addition to Nissan's North American lineup. If you recognize the name, you may recall that Renault launched the Talisman sedan on the other side of the pond last summer. At the time, we noticed some striking similarities to the Maxima sedan we get here, though Nissan told us the two were unrelated. But that wouldn't necessarily stop the wagon from sporting a different badge on the nose and making the transatlantic journey to American showrooms. The long-roofed version of the Talisman measures 191 inches long making it only a little longer than the BMW 3 Series Sports Wagon we get here, while riding on the same 110-inch wheelbase. But where the Bimmer offers up to 53 cubic feet of cargo space, the Renault can fit nearly 60. It also boasts electronic dampers and four-wheel steering to keep it light on its toes, and offers a selection of four-cylinder gasoline and diesel engines ranging from 110 horsepower up to 200. Related Video: Featured Gallery Renault Talisman Estate View 31 Photos News Source: Renault Nissan Renault nissan maxima

Renault will split EV from combustion unit, seeks partnerships

PARIS — Renault has received several partnership proposals for the combustion engine unit it plans to create alongside one dedicated to electric vehicles and software, two sources familiar with the matter said. Renault plans to separate its electric and conventional car businesses, creating two entities to manage the shift towards fossil-free vehicles. "The group has already received partnership demands" for its internal combustion engine unit, one of the sources said. By bringing in partners on the combustion engine side Renault aims to free up funds to invest in electric vehicles, a technology in which it was a pioneer with Nissan and Mitsubishi, but in which it is now eclipsed by pure players such as Tesla. Renault intends to retain majority ownership of its electric division, which will employ about 10,000 people and which could be bourse-listed via an IPO in the second half of 2023. However, it will only remain a reference shareholder, not a controlling shareholder, of the combustion engine unit, which will have similar staff levels, said two other sources familiar with the plans. One of the sources said Renault may hang on to a 40% stake. Renault declined to comment. The carmaker at a capital market day this autumn will set out its plans for its electric arm based in France and the combustion unit headquartered abroad. That entity will include factories producing engines and gear boxes for gasoline and hybrid cars in Spain, Portugal, Turkey, Romania and Latin America. Among potential partners for its combustion engine business, CEO Luca de Meo in April mentioned Nissan, other automotive groups and long-term investors. De Meo is set to travel to Japan next month to discuss potential Japanese participation in its electric and combustion engine projects. Renault is undergoing a major restructuring aimed at restoring its finances and recently signed partnerships beyond its historical alliances with Nissan, Mitsubishi and Mercedes, such as with China's Geely Automobile Holdings. This month it sold 34% of its South Korean unit to Geely, which owns Volvo Cars and is a shareholder in Mercedes. With Geely, Renault plans to develop hybrid vehicles which will be assembled in its plant in Busan, South Korea. Earnings/Financials Green Mitsubishi Nissan Renault