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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.

2017 Infiniti Q60 glitters in gold for the Neiman Marcus Christmas catalog

It's that time of year again. The air is getting cooler, the leaves are changing colors, and Neiman Marcus has selected this year's car for its annual Christmas Book. The limited-edition ride is a 2017 Infiniti Q60 based on the 400-horsepower Red Sport 400 model. What really sets this Neiman Marcus version apart from the average Red Sport is the striking paint job. Called Solar Mica, the paint looks a bit like a glossy gold leaf. Combined with the Gallery White leather interior with Silver Optic Fiber trim, this is an Infiniti that would be perfect for Yukon Cornelius. In addition to the color scheme, the car comes with an ivory leather weekend bag, an indoor car cover with Neiman Marcus branding, a plaque with the VIN number, and a certificate of authenticity. Oh, it also comes with a $63,000-price tag, which is a about $10,000 more than an entry level Red Sport 400 with rear-wheel drive. Neiman Marcus will only offer 50 examples of this Infiniti, and it goes on sale at noon on November 2. Interested buyers can call to reserve one at (844) 367-6971. If you're serious about buying, you'll probably want that number on speed dial. The special edition Neiman Marcus cars tend to sell out fast. In 2009, 50 Jaguar XJLs sold out in just over four hours. In 2012, 12 McLaren MP4-12C Spiders flew out the door in two hours, and in 2006, 50 BMW M6 convertibles vanished in a stunning 92 seconds. Related Video:

Infiniti QX70 is fini, for now

We knew it first as the FX, debuting in 2003 as a bulgingly macho SUV/crossover thing with an impossibly long hood. It was quick and powerful, and lower-slung than typical SUVs, more like a tall wagon. Infiniti later dialed the cartoonishness of it back a few notches and started calling it the QX70. Now, the QX70 is going to take a little break, disappearing from the lineup for a few years while QX50 and QX80 redesigns are rolled out. The QX70 is sporty, with a 325-horsepower 3.7-liter V6. But it's an aging model and a bit of a slow seller - last year, Infiniti moved one-seventh as many QX70s as it did its kid-hauling cousin the QX60 - which seats more people (seven, to the QX70's five) and is less expensive. The QX70 was once popular like that, selling 30,964 as the FX in 2004. But that was long, long ago. Last year it sold 6,261. The QX70 nameplate is expected to be back in 2021 or 2022, in a redesign based on the Nissan Murano and built at Nissan's plant in Canton, Miss. Related Video: Featured Gallery 2015 Infiniti QX70 Plants/Manufacturing Infiniti Crossover SUV redesign