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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.

Infiniti's Detroit concept to be 'very, very, very, very close' to new Q60

Add one more vehicle to the tally of reveals slated for the 2015 Detroit Auto Show. Alfonso Albaisa, executive design director at Infiniti, has confirmed that the marque will be showing a new concept on January 13, the second media day. More importantly, though, this concept won't be another flight of fancy like many of Infiniti's past show cars. Instead, it will foreshadow the arrival of a replacement for one of its oldest vehicles, the Q60, a model better known as the G37 Coupe. "On January 13, you're going to see a concept car that's very, very, very, very close to the next Q60," Albaisa told Motor Trend. There isn't much to go on beyond that, sadly, although we are free to speculate. Infiniti's past would indicate that the Q60 would carry on its role as a two-door version of the Q50 sedan, with styling influenced by its four-door sibling. While that makes sense, there's also an argument to be made for departing from the Q50's styling in favor of a more expressive look that could allow the two-door model to stand out. Whichever avenue Infiniti chooses, we'll have an even better idea in just a few short months.

Infiniti introduces Q70 Premium Select Edition to Monterey crowds

Infiniti has made its presence at the 2015 Monterey Car Week known, introducing a new version of its flagship sedan, the Q70. As far as special editions go, the new Premium Select Edition Q70 is fairly light on upgrades, going for minor aesthetic tweaks rather than rocking the boat too heavily. Unsurprisingly, one of the most obvious changes is down low, where Infiniti's stylists have fitted new 20-inch wheels. The gunmetal hoops are joined by dark chrome trim on the fascia, a new rear bumper, and a decklid spoiler. Buyers have the choice of two interior trims. There's Graphite and Stone, both of which feature semi-aniline leather, a "suede-like" headliner, and aluminum interior trim pieces. Infiniti isn't too picky when it comes to powertrains for the Premium Select Edition, although there are some restrictions. It can be had with both the 3.7-liter V6 and 5.6-liter V8 and in rear- or all-wheel-drive models. Weirdly, though, you can't get the stylish trim on the Q70 Hybrid or on long-wheelbase models. We can't tell you how much it'll cost to add the special-edition trim, because Infiniti did not deign to release pricing info. We can, however, tell you that the Q70 Premium Select Edition will hit dealers this November. Look for more, including live images of the new sedan, as the Monterey Car Week continues. Until then, scroll down for the official press release. Related Video: 2016 Infiniti Q70 Premium Select Edition debuts at Pebble Beach Concours d'Elegance PEBBLE BEACH, Calif. – Infiniti today announced that the new 2016 Infiniti Q70 Premium Select Edition will be on display this week in the Infiniti Pavilion at the Pebble Beach Concours d'Elegance. The specially equipped Q70 premium sedan will be available at Infiniti retailers nationwide beginning in November. "Following the introduction last year of the new Infiniti Q70 long-wheelbase model, we are continuing to expand our flagship Q70 sedan's portfolio of offerings," said Randy Parker, vice president, Infiniti Americas. "The new Premium Select Edition package gives the Q70 an extra touch of premium elegance that is right at home here at Pebble Beach – or in any neighborhood or driveway across the country." The Q70 Premium Select Edition's exterior offers dark chrome trim, a darkened lower rear bumper, a rear decklid spoiler and unique design and color 20-inch aluminum-alloy wheels with 245/40R20 all-season performance tires.