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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 GT-R takes a bloody whack at supercar rivals in fake ads

A big part of what makes a supercar super is how it makes you feel, but the performance stats and bragging rights are undeniably a big part of the equation as well. Which means you can't ignore the fact that, even with its price ever escalating, the Nissan GT-R makes minced meat out of European exotics costing twice or three times as much.
That's the inspiration for this trio of fake ads from photographer Tim Kent. In this mock campaign, Kent has depicted the GT-R as a butcher's knife and the European exotics as pieces of slaughtered meat. Ferrari is symbolized by a package of horse meat, Porsche by a pack of sausages and Lamborghini as a pair of, um... "prairie oysters".
Of course the ads are never going to run anywhere, and if you're squeamish (or vegetarian) we wouldn't suggest looking at them in close proximity to your lunch. But we have to admit they're creative, and effective.

Next Nissan Rogue flaunts its new look

Remember last April, when Nissan told us it would be launching five new models over the course of 15 months? Well, we've seen the Altima, Pathfinder, Sentra and Versa Note, so that magical fifth model has to be the new Rogue, which our spy photographers recently caught testing. Despite looking like a hodge-podge of black duct tape and garbage bags, we can clearly see that the new Rogue takes a lot of its styling cues from the Hi-Cross concept that Nissan showed at the 2012 Geneva Motor Show. And that's fine - we found that CUV concept to be a decidedly handsome thing, and certainly more attractive than the weird little Rogue that currently roams the streets.
Details surrounding the next Rogue are still very unclear, though our spies suggest that it could be powered by a new 1.2-liter supercharged four-cylinder engine, good for something like 113 horsepower and 140 pound-feet of torque. We'll see about that, since those numbers represent a drastic drop in power versus the current Rogue - to the tune of 57 hp and 35 lb-ft. A diesel engine for other markets is expected to be on offer, and a plug-in hybrid version is also rumored to be in the works, though that won't show up at the vehicle's initial launch.
If Nissan sticks to its plan of showing these five new models in the course of 15 months, that means we should see the Rogue in July. Of course, since things don't always go as planned, it could be many more months before all that camouflage is taken away.