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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.

Autoblog fan favorite car ads from Super Bowl XLIX

Super Bowl XLIX is in the books, and the New England Patriots emerged victorious. Of course, if you're like us, the big game wasn't so much about the battle between the east coast and west, so much as a fight between the world's automotive advertisers. We collected and collated all of last night's new ads and put them together for you to vote on. And yes, we're limiting this year's contest to last night's new features. That's why you aren't seeing Dodge's epic Wisdom among our collection of commercials, and it's a similar story with Chevrolet's Truck Guy Focus Group series, which highlights the new Colorado. You can still vote for your favorites. We won't be closing the voting on our Super Bowl page, so while the winners and losers are correct as of this writing, it's entirely possible that there could be some changes in the rankings as time goes on. So, without any further ado, here are the winning ads based on your voting. Nissan: With Dad Fiat: Ready For Action Jeep: Beautiful Lands BMW: Newfangled Idea Mercedes-Benz: Fable NASCAR: America Start Your Engines As for those ads that failed to impact you, loyal readers, Toyota was the absolute, undisputed loser. The Japanese brand ran four ads in total – two for Toyota and two for Lexus – and all of them have negative tallies as of this writing. Lexus' Make Some Noise and Lets Play and Toyota's One Bold Choice and My Bold Dad both had very weak showings among the commercials that aired, although they weren't alone. Neither Mazda nor Kia scored particularly well, despite featuring celebrity magic act Penn and Teller and former James Bond, Pierce Brosnan, respectively. Chevrolet was the winner of the losers, as of our writing, recording the fewest downvotes for its audience-punking The Big Game ad. If you want to take a second look at the losing ads, you can head back to our Super Bowl page for the complete collection. But for now, head into Comments and let us know what you think of the results.

Recharge Wrap-up: first Chevy Volt hits 200K miles, DriveNow launches in London with BMW i3 on deck

The first Chevrolet Volt has driven over 200,000 miles. According to the owner, Erick Belmer, the car, which he purchased on March 28, 2012, is "holding up flawlessly" with "no noticeable battery capacity loss." Belmer has a commute of about 220 miles per day, rotates his tires every 10,000 miles, and gets an oil change every 38,000 miles. Belmer still loves driving his "dream car" every day, and says it is "wonderfully engineered." Read more at Inside EVs. DriveNow has launched in London, and will include the BMW i3 as part of its carsharing fleet. Daimler shut down its Car2go operations there just six months ago. Currently, DriveNow members have access to the BMW 1 Series and Mini Countryman, but come spring of 2015, DriveNow, which is a joint venture between BMW and Sixt SE, will add 30 all-electric i3 EVs to its London service. DriveNow's rates for London are set at 39 pence per minute, with an hourly maximum cost of GBP20 (about 61 US cents and $31, respectively). The service currently operates in the boroughs of Islington, Haringey and Hackney, with hopes of expanded service in the near future. Read more at Hybrid Cars or at Reuters. FIA's Formula E electric racing championship series received the Autosport award for Pioneering and Innovation. The award ceremony was a black-tie event at the Grosvenor House Hotel in London. Formula E CEO Alejandro Agag accepted the award. "Many people in motorsport, when we started Formula E, didn't think we would make the first race," says Agag. "To announce we were doing a championship with cars that didn't then exist was a real challenge. But after that first race in Beijing, everything worked." Read more at Formula E's website. The Nissan Leaf has driven over a billion collective kilometers. That's more than 621.3 million miles. Nissan said in August that it expected to reach that mark by January, and it has done just that. To celebrate, Nissan Europe has created a video to thank its 147,000 Leaf drivers to bring the car to that substantial milestone in less than four years. Check out the video below. Featured Gallery 2014 Chevrolet Volt View 11 Photos Related Gallery 2014 BMW i3: First Drive View 33 Photos Related Gallery 2013 Nissan Leaf: First Drive View 15 Photos News Source: Inside EVs, Hybrid Cars, Reuters, Formula E, YouTube: Nissan EuropeImage Credit: Chevrolet Green BMW Nissan Transportation Alternatives Electric Racing Vehicles recharge wrapup