Auto blog

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.

Nissan rolls Versa Note inside world's largest zorb [w/video]

With features like lane departure warning, blind spot monitoring and moving object detection bundled into its Safety Shield suite, Nissan touts the Versa Note as among the safer vehicles on the road. And to highlight that, the Japanese automaker has taken its diminutive hatchback Zorbing.
Zwhat now, you ask? Zorbing. It's a sport (really more of a recreational activity, if you ask us) that involves getting into a giant inflatable ball, rolling down a slope and, well... that's about the extent of it. It's the same thing we did on hills as kids, only with more plastic. And ridicule.
The CarZorb which Nissan had crafted for the Note measures 60 feet around and weighs a metric ton. Nissan tested the device, which took two months to make, at a "top secret military training facility in the UK," then placed the hatchback inside and rolled it down a hill, all for the sake of the two-minute video clip below. So we hope you enjoy.

Did Amazon just deliver a car in a giant box?

Back in September, reports started rolling in that Amazon would get into the auto sales business after a promo for the Nissan Versa Note appeared on the online retailer's page. That link didn't actually sell a car, but instead acted as a referral service for potential customers, linking them up with dealers. A recent image that's been floating around on Reddit and that was picked up by The Huffington Post, though, has us wondering if Amazon has dove into the actual business of selling cars, rather than just referring people to dealers.
The image, above, shows an enormous Amazon box on the back of a flatbed tow truck. According to HuffPo, this could be one of the cars sold through the earlier promotion for the Versa Note (which was sweetened with the addition a $1,000 Amazon gift card). Apparently, three of the Versas purchased would arrive in such a fashion. Then again, this could all be nothing more than an elaborate publicity stunt. Amazon is, after all, the company has been touting drone delivery of its goods.
What do you think is in the box? Let us know down in Comments. Bonus points for those that come up with an idea as absurd as the bulk order of banana slicers HuffPo mentioned.