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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 buys jalopy Maxima after seeing filmmaker's epic sales ad

When Luke Akers wanted to sell his 1996 Nissan Maxima GLE - yes, the one seen above that needs a ratchet strap to keep the front end from bursting with joy - the Florida filmmaker turned on his cameras and yelled "Quiet on set!" The result is a one-minute videographic homage to mankind's monuments, narrated with all the intensity of a BBC documentary to sell a 17-year-old sports sedan that comes "fully loaded with an engine, wheels, tires and an automatic transmission."
Just like the car in question, the ad did its job: Nissan bought the Maxima from Akers and the company donated another $1,000 to his charity of choice. Three cheers to both Akers and Nissan for their work. You can check out the video below, and head to the Ikonik Films site for the humorous print ads that were also part of the campaign.

Nissan Rogue redesigned with three rows for 2014

Nissan has been on a roll lately, redesigning its core model line with all-new versions of the Altima, Pathfinder, Sentra and Versa Note released this year. But the Japanese automaker wouldn't leave out the Rogue, its second-best-selling model in the US.
Like the Range Rover Sport, Mitsubishi Outlander and Ford Explorer, the second-generation Nissan Rogue has gained an optional third row of seats for seven-passenger capability. Along with the middle and rear rows, the front passenger seat can also be folded flat for the benefit of cargo capacity, and the cabin has been redesigned for an airier look and feel.
Despite the added space inside, the new Rogue is only marginally larger than the model it replaces, with a 0.6-inch longer wheelbase offset by shorter overhangs front and rear. A lower drag coefficient ought to help reduce wind noise and improve fuel consumption as well.