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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 takes to Facebook to explain model names, mentions 550-hp flagship

Infiniti caused quite a stir this week when it announced that it would be changing its vehicle names so that all of its cars start with Q and all of its crossovers and SUVs start with QX. Many displeased fans and owners took to social media to voice their opinions, and Johan de Nysschen, the new Infiniti boss, responded today with a Facebook post of his own.
In the note, de Nysschen talks about the challenge of product expansions with alphanumeric names that allow for flexibility without encroaching on the trademarked names of other automakers, although we're sure de Nysschen's former colleagues at Audi aren't looking forward to a Q30 or Q50. He also says that as Infiniti grows to become a global brand, the new naming structure - which closely mimics Volvo - is also designed to reduce confusion (just don't tell that to current owners). One thing that de Nysschen assured wouldn't happen is a confusing "X" added to the end of all-wheel-drive model names that would result in names like the Q60X or, even worse, the QX50X.
While we are not looking forward to relearning Infiniti's product lineup, de Nysschen has given us something to look forward to courtesy of a new performance sedan. From the brief explanation of this car, which was used as a key example in explaining the validity of the new names, we learned that the new model will be a performance version of what is now the M sedan, and it will be powered by a "charged induction" 3.0-liter V6 producing more than 550 horsepower. The M's name will become the Q70, but as of right now, it isn't clear if this will be an IPL model or something else.

Production Infiniti QX50 will mostly look like the concept

At this year's Detroit auto show, we got a look at the nearly production-ready Infiniti QX50 concept. Now we get our first look at how close to production the concept was, thanks to new spy photos. The overall shape remains very similar to that of the curvy concept. However, the greenhouse looks taller with more glass. While it isn't quite as low and aggressive-looking, we're sure drivers will appreciate the small compromise for better visibility. At the front, there are more changes that are a little less subtle. The grille looks a bit smaller all around, and even looks a tad lower than the concept. The headlights also don't stretch as far back, and they aren't as narrow either. In the front bumper, the two side scoops of the concept have been significantly toned down, and now look like more traditional grilles that follow the shape of the bumper. The lower grille is more open with just a mesh insert instead of the concept's skidplate-style chrome bar. Moving to the back, we find the taillights look nearly identical to the concept's. They're very long and narrow, and they connect into a metal crease that looks a bit like a spoiler. It looks as the though the faux skidplate treatment on the rear bumper will also make it to production, but the integrated exhaust tips have given way to more conventional round tips in bumper cutouts. It also may have lost the concept's air vents on each side of the hatch. Though they may have also just been toned down enough that they don't show through the camouflage. When the QX50 hits dealers, it will be available with Infiniti's fascinating variable compression four-cylinder making 268 horsepower. The crossover will also feature a version of Nissan's ProPilot semi-autonomous technology, which has been implemented in the Nissan Serena minivan in Japan. We expect to see the fully revealed production model very soon, possibly by the end of the year. Related Video: