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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.

2014 Infiniti Q50 hits the web early, courtesy of... Infiniti

Well, what do we have here? It seems that Infiniti.ca, the official Canadian website of the Japanese automaker, accidentally published a load of 2014 Q50 images ahead of its official debut at the 2013 Detroit Auto Show.
As you can see in our high-res image gallery of screen shots above, the 2014 Infiniti Q50 carries along in the footsteps of the marque's current curvy design language. There's the requisite pinched chrome grille, upswept headlight clusters, and a hood with multiple flowing ridges, peaks and valleys.
As confusing as the newly Q-infused lineup may be on paper, there's simply no mistaking the new Q50 for anything but an Infiniti. You can expect a whole slew of images, facts, figures and commentary on the new luxury sedan on Monday, but until then, feel free to let us know what you think in the Comments.

2020 Infiniti Edition 30 cars debuting at Pebble Beach Concours d'Elegance

Infiniti is celebrating its 30th anniversary at the Pebble Beach Concours d’Elegance next week, and itÂ’s rolling out a special edition for several models in its lineup. The anniversary cars are to be called Edition 30, and all of them feature similar changes. YouÂ’ll be able to get an Edition 30 for the Q50, Q60, QX50, QX60 and QX80. ThatÂ’s two sedans and three SUVs that are said to arrive in dealers this fall as 2020 model year cars — even though Infiniti launched in 1989, the first car it sold was a 1990 model year, so this matches up perfectly. Pictures of the Edition 30 cars are scant, but weÂ’ll be able to check them out in person at Pebble next week. Infiniti says they all feature special dark chrome accents in the exterior grille surround, fender trim and a little around the rear end, as well. YouÂ’ll get black side mirrors, dark gunmetal gray wheels and a body color rear apron. Additionally, all of them will be equipped with the ProAssist package as standard. This package includes driver assistance features like adaptive cruise control, distance control assist, a 360-degree camera, backup collision intervention and predictive forward collision warning. Pricing isnÂ’t available at this point for the special edition models, and we don't know if production numbers will be limited, either.