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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.

Watch Formula Drift Championship leader Chris Forsberg drift a 1975 Datsun 280Z

Chris Forsberg won the Formula Drift Championship in 2009, was in the catbird seat to win it last year until the final race of the season and started this year's season with a win at Long Beach. That is how he can be provide the example for Clarion USA's tagline, "Dream like a champion."
In this three-minute video for the audio components manufacturer, Forsberg gives up the race suit for a corporate suit, then takes time out of his commute to think about what he'd rather be doing. In a 1975 Nissan 280Z with a turbocharged 2.0-liter Skyline RBDET20 engine. We're sure this has never happened to any of you before.
You can watch how dream begins - and suddenly ends - in the video below.

Nissan could offer plug-in hybrids by 2016

Nissan is recharging the idea of a production plug-in hybrid model. The Japanese automaker may start making a plug-in hybrid by as soon as late 2015, with deliveries to start in time for the 2016 model year, Green Car Reports says, citing an interview with company executive Andy Palmer. Those comments go against what Nissan said during the North American Auto Show in January. Palmer didn't specify what class of vehicle the plug-in hybrid would be, but he said battery-electric vehicles are best suited for cars 3,850 pounds or lighter, according to Green Car Reports. That would imply that the plug-in hybrid powertrain may be used for a mid-sized sedan or a crossover vehicle. Either way, a Nissan PHEV may pair the Nissan Leaf's 108-horsepower electric motor with a gas engine. Whether Palmer's projected timeframe was more of a ballpark estimate is anyone's guess, as the company hasn't made official plans for a 2016 model-year plug-in hybrid, Nissan spokesman Tim Gallagher wrote in an e-mail to AutoblogGreen. Either way, feel free to join us in the comments below. Nissan is coming off its best-ever sale month for the Leaf, which has moved about 115,000 units around the world. Domestic sales of the Leaf in May rose 46 percent from a year earlier to a monthly record 3,117 vehicles. Through the first five months of the year, Leaf sales increased 36 percent, to 10,389 units.