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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.

Nissan NV200 puts on a Bowtie as new Chevy City Express

Your eyes do not deceive you - that is, in fact, a Nissan NV200 work van with Chevrolet badging. General Motors and Nissan today announced a partnership where the Japanese automaker will build Bowtie-badged vans for Chevy dealers to sell throughout the United States and Canada. The new van, called the City Express, is expected to go on sale in the fall of 2014.
"Our fleet customers have asked us for an entry in the commercial small van segment, so this addition to the Chevrolet portfolio will strengthen our position with fleets and our commercial customers," Ed Peper, US vice president of GM fleet and commercial sales, said in a press release.
No details have been released regarding specific changes for the new City Express, though from the images released today, it's clear that the vehicle's front fascia has been reworked, and some super-sexy new wheel covers have been added. If we're honest, the NV200 wasn't all that pretty to begin with, and this, well, isn't any better. Not that looks are of primary concern in the commercial truck business, of course.

Infiniti confirms new "premium compact" to be built in UK

Aside from certain naming-related news, Infiniti has actually had some decent product news to announce this week. The company's president, Johan de Nysschen, alluded to a new 550-horsepower performance sedan, and now the automaker has confirmed that a new "premium compact" will go into production in 2015. Based on the fact that this new model will be built alongside the Nissan Leaf at the automaker's Sunderland, UK assembly plant, we could only hope that it's a production version of the LE Concept (shown above).
Sunderland already produces Nissan products like the Qashqai, Juke and Note, and as a part of an investment of 250 million British pounds (around $406 million USD) for the new model, the plant would add an extra 280 jobs with the capacity to build 60,000 of the new Infinitis annually. Adding the premium compact at Sunderland means that Infiniti will have to change its plans for another new model, a bigger "C-segment hatchback," which could very well be a production version of the Etherea Concept.