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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.

Tesla Model S drivers put way more miles on their cars than Nissan Leaf owners do (we think)

Just a few weeks ago, Nissan announced that its customers have driven over a billion electric kilometers in the four years that the world's best-selling EV has been on the road. That heady milestone means, Nissan says, that the Leaf has saved 180 million kilograms of CO2 emissions around the world. The billion kilometers have been split among the 147,000 Leaf vehicles that Nissan has sold. Well, not really, since the billion kilometer total only counts Leaf EVs registered with CarWings, which Nissan says is 54 percent of the total sales. That's 79,380 cars and results in an average – and it's only a rough average, but what're you gonna do? – of 12,597 miles per car. Let's keep that number in mind for a minute. Today, despite going on sale a year and a half after the Leaf (June 2012 versus late 2010), Tesla Motors Tweeted today that Model S drivers have hit the same numerical milestone. Tesla didn't say how many of its vehicles were involved in its count, but we think that Tesla has sold at least 50,000 Model S electric vehicles globally (about 2,650 in 2012, 22,450 in 2013, 21,821 for 2014 through the end of September), so we'll estimate a rough average for each Model S of 20,000 miles. So, in case anyone ever needs numeric proof that a Model S is more fun to drive than a Leaf – that's the only possible thing this could mean, right? *ahem, longer range* – now you've got the data. {C} This content is hosted by a third party. To view it, please update your privacy preferences. Manage Settings. Nissan says "thanks a billion" to LEAF owners Nissan LEAF drivers registered on CarWings telematics have collectively driven ONE BILLION KILOMETERS worldwide* Globally, Nissan LEAF drivers have saved more than 180 MILLION kilograms of CO2 emissions* Over 147,000 Nissan LEAF vehicles have been sold globally to date ROLLE, Switzerland – Nissan has revealed that owners of the LEAF, its 100% electric car, have collectively recorded an impressive one billion kilometers on the CarWings telematics system worldwide – saving over 180 million kilograms of CO2 emissions* in the process. This incredible achievement comes almost four years since the LEAF was launched in 2010 as one of the first mass-market, pure-electric vehicles. It is now the best-selling electric vehicle in history, with over 147,000 LEAF vehicles sold globally to date, 31,000 of which have been sold in Europe.

Ferrari SUV and Aston Martin in Formula E? | Autoblog Podcast #529

This week, Editor-in-Chief Greg Migliore is joined by Green Editor John Beltz Snyder. They discuss Ferrari's SUV plans as well as Aston Martin's Formula E consideration. They also talk about cars we've driven including the Chevy Colorado ZR2, a Nissan Rogue ProPilot prototype and a Ford Shelby GT350. This week's podcast also features a car you don't need a license to drive. Autoblog Podcast #529 Your browser does not support the audio element. Get The Podcast iTunes – Subscribe to the Autoblog Podcast in iTunes RSS – Add the Autoblog Podcast feed to your RSS aggregator MP3 – Download the MP3 directly Rundown Ferrari SUV FCA keeping Jeep Aston Martin mulls Formula E Cars in the office: Ford Shelby GT350, Chevrolet Colorado ZR2, Nissan Rogue with ProPilot Assist The List: Drive a car that requires no license 3 Big Questions: Ferrari SUV or Lamborghini SUV? Chevy Colorado ZR2 or Toyota Tacoma TRD Pro? Ford Shelby GT350 with or without Performance Package? Spend my money Feedback Email – Podcast@Autoblog.com Review the show on iTunes Green Podcasts Aston Martin Chevrolet Ferrari Ford Jeep Lamborghini Nissan SUV Electric Performance Videos Formula E shelby nissan propilot