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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 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.

The Nissan Patrol may become America's next Armada

Plausible rumors are swirling that the Nissan Patrol, the Land Cruiser rival sold outside of North America, might come to the US as a replacement for the unrelated Nissan Armada. That large SUV's future was left ambiguous after the news of the Xterra's discontinuation, as Nissan's press release ominously promised information on the Armada "at a later date" without further elaboration. That left us scratching our heads and thinking that, perhaps, it would be quietly killed off in the future. If the rumors are true, it will be. And then it will be reborn. It'll join its old platform-mate, the Infiniti QX80, on the Patrol platform. The QX abandoned its Titan-based platform in 2011, becoming the Patrol-based QX80. So you can think of the Armada as catching up, a few years late. The QX80 was refreshed last year, a mainly cosmetic nip-and-tuck. The Infiniti utilizes the 5.6-liter, 400-hp V8 and a 7-speed auto, so it's a safe bet that this powertrain will make it into the Armada version. Less likely, but plausible, would be the availability of the new powertrains intended for the Titan XD and upcoming lower-grade Titans. The massive SUV market tends to be a bit conservative, so the Cummins diesel V8 that's the sole engine in the Titan XD right now seems unlikely. The forums are abuzz with a photo of what's purported to be a leaked marketing image of the new Armada, so head to this TitanXDForum thread if you'd like to see what that's about. (Spoiler: it looks a lot like the Patrol above, minus some of the Nismo flair.) Related Video: