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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 tries to Sway us with video teaser

Nissan is about to unveil the Sway concept at the 2015 Geneva Motor Show this week, but before it does, it's released this teaser clip to give us a better idea of what to expect. Previewed in a teaser image released last week, the Sway concept is the Japanese automaker's proposal to replace its Micra/March hatchback with something a bit more dynamic. It's said to borrow from the success of the Juke and Qashqai crossovers to give the new European-market Pulsar hatchback a baby brother. It's still a bit early to draw conclusions on the design and its prospects for production, but from what we can tell from this video clip, it looks promising. Watch this space for more. Related Video:

Nissan will restore Craigslist Maxima, display at headquarters [w/video]

Nissan showed that it had a great sense of humor when it bought Luke Aker's beat-up 1996 Nissan Maxima GLE for $1,400 back in December based solely on the quality of his tongue-in-cheek sales video.
Aker's Maxima had been thoroughly driven. It needed a strap to keep its hood closed, had front end damage, a missing turn signal and shredded leather seats. Of course, like Aker said in his ad, the car was still "fully loaded with an engine, wheels, tires and an automatic transmission." How could Nissan resist?
After buying the car, Nissan teamed up with MotorAuthority to decide what to do with it. The winning idea was to restore the car to its proper condition and display it at Nissan North America headquarters in Franklin, TN, with Aker's video playing nearby. According to MotorAuthority, the car has finally made it there, and its rebirth will begin soon. Nissan is not sure when the car will go on display.