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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.

Weekly Recap: Chevy and Alfa plot comeback strategies

Chevrolet and Alfa Romeo were two of the 20th Century's most iconic automotive brands. Chevy embodied America's post-war power and confidence. Alfa was the definition of the stylish Italian sports car. They reached halcyon heights in the 1950s and '60s, before declining precipitously amid new competition, changing consumer tastes, and uneven corporate management. Both say 2015 is the start of something better, and this week Chevy and Alfa laid out ambitious plans and showcased new cars that they hope will make them more relevant this year, and in the coming years. Each brand sits at its own crossroads, and their paths forward are as different as the Chevy Cruze and the Alfa Romeo Giulia. Chevy is still a sales beast, as evidenced by its volume of 4.8 million vehicles sold around the world last year. Chevy executives are fond of saying one of their cars is sold every seven seconds, which illustrates the strength and reach of a car brand that is the fourth largest in the world. "Make no mistake about it, we are a brand for the people," said General Motors North America president Alan Batey. But he wants consumers to want to buy a Chevy for its design and technology, not simply because it's affordable. That starts with all Chevys now featuring a distinctive a family look, with sporty cues from the Corvette or strong lines that riff on the Silverado pickup. "We want people to fall in lust with our cars," said Mike Pevovar, executive design director for Chevy passenger cars. "That initial emotional attraction has to be right on the exterior, and that's where form comes into play." Chevy is also loading up its cars, like the freshly unveiled 2016 Chevy Cruze, with technology to appeal to a younger crowd that prizes connectivity. The Cruze will offer Apple CarPlay and Android Auto with its MyLink infotainment system, and OnStar with 4G LTE and wifi. Seeking out younger buyers is also sound business practice: Millennials now outnumber Baby Boomers as the largest single age group in the United States. Younger buyers also can improve a brand's image, which is another area where Chevy would like to improve. Chevy ranks 82nd on Interbrand's Best Global Brand's list, behind 11 other automakers. Apple is No. 1. "We need our own variation of the Genius Bar," Batey said. 2016 Alfa Romeo Giulia View 3 Photos Meanwhile, Alfa is in different shape.

GM, Ford, Honda winners in 'Car Wars' study as industry growth continues

General Motors' plans to aggressively refresh its product lineup will pay off in the next four years with strong market share and sales, according to an influential report released Tuesday. Ford, Honda, and FCA are all poised to show similar gains as the auto industry is expected to remain healthy through the rest of the decade. The Bank of America Merrill Lynch study, called Car Wars, analyzes automakers' future product plans for the next four model years. By 2020, 88 percent of GM's sales will come from newly launched products, which puts it slightly ahead of Ford's 86-percent estimate. Honda (85 percent) and FCA (84 percent) follow. The industry average is 81 percent. Toyota checks in just below the industry average at 79 percent, with Nissan trailing at 76 percent. Car Wars' premise is: automakers that continually launch new products are in a better position to grow sales and market share, while companies that roll out lightly updated models are vulnerable to shifting consumer tastes. Though Detroit and Honda grade out well in the study, many major automakers are clumped together, which means large market-share swings are less likely in the coming years. Bank of America Merrill Lynch predicts the industry will top out with 20 million sales in 2018 and then taper off, perhaps as much as 30 percent by 2026. Not surprisingly, trucks, sport utility vehicles and crossovers will be the key battlefield in the next few years, Car Wars says. FCA will launch a critical salvo in 2018 with a new Ram 1500, followed by new generations of the Chevy Silverado and GMC Sierra in 2019, and then Ford's F-150 for 2020, according to the study. Bank of America Merrill Lynch analyst John Murphy said the GM trucks could be pulled ahead even earlier to 2018, prompting Ford to respond. "This focus on crossovers and trucks is a great thing for the industry," Murphy said. Cars Wars looks at Korean (76 percent replacement rate) and European companies more vaguely (70 percent), but argues their slower product cadence and lineups with fewer trucks puts them in weaker positions than their competitors through 2020. Related Video: This content is hosted by a third party. To view it, please update your privacy preferences. Manage Settings. Featured Gallery 2016 Chevrolet Silverado View 11 Photos Image Credit: Chevrolet Earnings/Financials Chrysler Fiat Ford GM Honda Nissan Toyota study FCA