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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.

Jay Leno recaps Pebble Beach

Each year at the Pebble Beach Concours d'Elegance the picturesque, ocean-side setting of the golf course becomes a parking lot for a vast array of multi-million dollar vehicles. However, if you missed the posh event this year, then Jay Leno has you covered yet again. For a nearly hour-long installment of Jay Leno's Garage, the comedian has dumped his denim in favor of a suit to take viewers on an insider tour of the lavish gathering. He interviewed some of the most talented designers in the auto industry, too. Leno starts off checking out a few beautiful classics by the shore, but things really get interesting for his stroll down the Concept Car Lawn for a scoop on the vehicles of tomorrow. Ed Welburn tells Leno all about the Buick Avenir, and Shiro Nakamura offers a tour of the Infiniti Q60. Plus, there are detailed looks at the Lincoln Continental, Hyundai Vision G Coupe, and Bentley EXP 10 Speed 6. News Source: Jay Leno's Garage via YouTube Bentley Buick Hyundai Infiniti Lincoln McLaren Classics Videos Pebble Beach Jay Lenos Garage infiniti q60 buick avenir bentley exp 10 speed 6

Infiniti releases first image of premium compact Q30 Concept

Behold, the Q30 Concept. Slated for a worldwide debut in Germany next month at the Frankfurt Motor Show, this concept previews a new entry-level premium compact that Infiniti hopes will attract younger buyers to the brand, as well as give it a competitor in a burgeoning new class that's quickly filling up with options.
What will set the Q30 apart? Aside from a bold and aggressive design that picks up where the new Q50 and many concepts have left off, Infiniti says the shape combines elements from three bodystyles, all of which appeal to the sort of buyer it's hoping snare. Can you guess which three? No peeking at the press release down below. Give yourself ten arbitrary points if your answer was coupe, crossover and hatchback.
Infiniti promises a ride height that will be high enough to earn crossover credentials, and we're guessing it's got an actual hatch back there, which leaves the coupe. Where's the coupe in the Q30's design? The influence of a two-door is a little more difficult to see with the naked eye, but what the Q30 shares with some four-door coupes on the market is a roofline that peaks and begins to slope back down before the B-pillar and rear set of doors.