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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 Q50 Eau Rouge running prototype driven by Sebastian Vettel

Infiniti's high-performance Q50 Eau Rouge concept might be one of the biggest teases in the current automotive world. It was first shown at the 2014 Detroit Auto Show as a body without an engine. Then, the sports sedan arrived at the Geneva Motor Show with a modified version of the turbocharged V6 from the GT-R under the hood, tuned to 560 horsepower and 443 pound-feet of torque, and with all-wheel drive. However, it was still just a concept. Finally, the Japanese luxury automaker is showing us what the Eau Rouge can do on the road - briefly.
The company brought reigning Formula One champ Sebastian Vettel along to get behind the wheel, for this all-too-short video from the Millbrook Proving Ground in the UK. There's more good news too. While Infiniti isn't saying that it's definitely going to build the Eau Rouge, it is "pressing ahead with the evaluation." More info about these tests will be released at the 2014 Beijing Auto Show at the end of April. Scroll down to watch Vettel drive the Q50 Eau Rouge and read a little more about it.

2014 Infiniti QX60 Hybrid gives us d'ej`a vu

If we were totally lazy, we'd just copy and paste the text from our Nissan Pathfinder Hybrid post into this one. Why? Because the Infiniti JX35 QX60 Hybrid you see here is pretty much identical to its Nissan-badged sibling. At least, in terms of mechanicals.
But we aren't lazy... completely. Instead, let's have a quick recap. Engine: Supercharged 2.5-liter mill mated to a 15-kilowatt electric motor. Fuel economy: 26 miles per gallon combined. Interior changes: None - the battery does not compromise any sort of cargo or passenger volume. Price: Roughly $3,000 more than the standard QX60.
If you feel like the nitty-gritty details are necessary, have a look at the official press release below for all the goods. Otherwise, peruse the images in our high-res image gallery and tell us if you can spot the difference between the Q-by-60 and its Nissan twin.