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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 to get Leaf-based electric sedan after all

Infiniti suffered a huge blow a few weeks ago when CEO Johan de Nysschen jumped ship after two years on the job to take the helm at Cadillac. As boss, he spearheaded change within the Japanese luxury brand and was among the biggest champions of the Q50 Eau Rouge. However, the company is far from sunk. Plans put in place prior to de Nysschen leaving are still on the table, according to Nissan product planner Andy Palmer to Automotive News, and that could mean a rosy future for the once AWOL LE sedan (pictured above) and other models.
Back in 2012, Infiniti promised that it would have the LE on the market as a premium electric sedan by 2014. It was supposed to share the battery pack with the Nissan Leaf but with a more powerful, 134-horsepower motor. But have you seen one on the road recently? The luxury EV was eventually shelved, but de Nysschen pledged the idea wasn't dead. Maybe now is a better time for it. According to Automotive News, the LE is rescheduled to launch in 2017 or 2018. The latest version would use the Leaf platform but with a more potent, next-gen battery to give it a range over 90 miles.
Of course, the LE isn't the only thing on the way from Infiniti; it also appears to be planning a two-pronged approach for small cars. Palmer recently tweeted that the company would build the forthcoming Q30 hatchback and QX30 crossover in the UK in 2015. Additionally, the automaker is firing up a new joint venture factory in Mexico with Mercedes-Benz; building compact models there starting in 2017. According Automotive News, the Mexican-built models will be more US-focused while the UK-built ones will appeal more to Europeans.

Infiniti's QX Sport Inspiration is still attractive, in Paris, and now gray

Yes, crossovers tend to be boring. But this one is pretty! Then we remember it's going to turn into the front-drive-based QX50, so we automatically lose some interest. But the wheels will be driven by Infiniti's new VC-Turbo engine, which is kind of exciting! And for the 2016 Paris show, those wheels are bigger – 22-inchers in place of the 21s that the QX Sport Inspiration concept debuted with in Beijing earlier this year. (It's hard to tell a difference in the photos, but you can bet the imaginary ride of this concept will suffer, imaginarily.) The 22s are also painted bronze now along with the brake calipers, and the whole vehicle gets a coat of matte gray paint to replace the silver it was originally shown with. There's also some new brown leather in the previously very black and white interior. It's still pretty black and white, actually. Then there's the variable-compression-ratio VC-Turbo engine that will power the production QX50. We're getting a better look at this 2.0-liter four-cylinder turbo in cutaway form at the Paris show, and it continues to fascinate. It's a pretty neat thing, with a movable stroke position that allows it to vary the compression ratio between 8:1 for performance and 14:1 for efficiency (when the turbo isn't needed). That might not sound terribly cool, but it's a pretty big step forward in the march of efficient power. So yeah, crossovers can be boring, but at least this concept and the production car that will soon follow it have a few things going for them. Related Video: Featured Gallery Infiniti QX Sport Inspiration: Paris 2016 View 12 Photos Related Gallery Infiniti QX Sport Concept Related Gallery Infiniti QX Sport Inspiration concept for Paris View 10 Photos Image Credit: Live photos copyright 2016 Drew Phillips / Autoblog Paris Motor Show Infiniti Crossover Concept Cars Luxury 2016 paris motor show infiniti qx sport inspiration concept