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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.

Cars with the most reckless drivers are full of surprises

Insurify is a site for comparing auto insurance quotes. Because insurance shoppers need to submit information like the vehicles they're driving and the infractions they've compiled while driving those vehicles, Insurify has quite the database of correlations tying certain models to a habit of breaking certain laws. When the site's data analysts decided to compile a list of the top ten models for reckless driving citations in the decade from 2010 to 2019, the ranking contained a few wild entries. The Dodge Challenger making the countdown will surprise precisely zero people. But the Saturn L200? First, a definition: USLegal.com defines reckless driving as "driving with a willful or wanton disregard for safety. It is the operation of an automobile under such circumstances and in such a manner as to show a willful or reckless disregard of consequences." So this list is a caution about particular drivers more than the cars. For a baseline, according to Insurify data, for any random model, 15 out of 10,000 people who drive that model have picked up one citation for reckless driving. Back to that Challenger, then. No shocker for being here, but it's actually number 10, with 44 out of 10,000 Challenger drivers nabbed for a willful disregard of consequences on the road. That's better than the first surprise entry, the Saturn L200, a sedan only on sale for six years, with the least horsepower on the list, and out of production since 2005. The data set put drivers of GM's extraterrestrial sedan at 45 reckless pilots per 10,000 drivers. There are two pickups on the list, the only modern one being the Ram 1500 at eighth, with a rate of 46 in 10,000. Somehow, drivers of the third-best-selling pickup in the U.S. outrun the overwhelming numerical superiority of the best-selling vehicle in the States, the Ford F-150. The other pickup is the Chevrolet K1500 at number five, with a rate of 56 in 10,000. This is not only the oldest vehicle on the list, it went out of production in 2002, before any other vehicle on the list. Between the trucks, the Volkswagen CC slotted in at seven with 47 in 10,000 reckless driving chits, the Cadillac ATS slipped into sixth with 48 in 10,000.  The top four is a bag of unexpected. The Nissan 370Z is the first hardcore sports car on the list at number four, with 61 in 10,000 Z drivers flaunting their Fairladys in the face of Johnny Law.

Chinese Nissan Leaf goes on sale in September as Venucia e30

The upcoming Chinese version of the Nissan Leaf, the Venucia e30, was not the highlight of the Dongfeng Nissan stand at this year's Beijing Motor Show. That honor goes to the R30, a compact car with "segment-competitive fuel economy" and a starting price of under RMB 50,000 ($8,033 US). But that doesn't mean Dongfeng didn't make some news about the debut of the world's most popular electric vehicle in the world's most populous country. Dongfeng Nissan will start selling the e30 in the Chinese retail market this September. In a world where EV promises are not always worth the paper they're printed on, it's nice to see this target date is actually ahead of schedule. The sales launch follows EV pilot programs that saw 300 of the EVs rack up a total of one million kilometers (621,000 miles) in Guangzhou, Xiangyang and Dalian since December 2013. The e30 might just be the first or many EVs, since Donfeng-Nissan showed off the Viwa Concept EV last year. There are a few more details in the press release below. Dongfeng Nissan Unveils VENUCIA R30 at Auto China 2014 BEIJING, April 20, 2014 /PRNewswire/ -- Dongfeng Nissan Passenger Vehicle Company ("Dongfeng Nissan"), the passenger vehicle business unit of Nissan's joint venture in China, today unveiled R30 at Auto China 2014. R30 is the 4th production model for the company's new VENUCIA brand. The compact R30 delivers segment-competitive fuel economy with the strongest engine in class through a 1.2-liter gasoline engine, features a spacious interior, and offers easy handling for drivers to provide a high quality yet competitively priced car to Chinese consumers. The price of the main grade will be less than RMB 50,000. "Very competitively priced, R30 is the perfect entry car for Chinese consumers," said Ren Yong, Deputy Managing Director of Dongfeng Nissan. "I believe many Chinese consumers will choose R30 as their first car in the continuing motorization of China." Bookings for R30 will start within the next two months. Dongfeng Nissan also announced that e30, Venucia's electric vehicle, will be sold in the retail market starting in September. The company has already commenced EV pilot programs in the cities of Guangzhou, Xiangyang and Dalian, with a total of 300 e30s recording a total mileage of one million km since the programs started in December 2013. Venucia recorded sales of more than 100,000 units in 2013 and is targeting a 50 percent increase in sales this year.