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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.

Infiniti Q60 to pack upwards of 400 horsepower

Infiniti turned heads when it unveiled the Q60 Concept at the Detroit Auto Show last month. While the concept coupe was revealed with a new 3.0-liter twin-turbo V6, the Japanese luxury automaker didn't indicate how much power it would produce. But now we may have our first indication. Speaking with an unidentified source at Infiniti during the Canadian International Auto Show in Toronto, AutoGuide reports that the production Q60 will arrive late in 2016 and pack at least 400 horsepower. A higher-output version of the same engine, however, could produce as much as 450 hp. That would still be significantly less than the Q50 Eau Rouge, which packed the larger 3.8-liter twin-turbo V6 from the Nissan GT-R with 560 hp. It would put it right on pace with the likes of the BMW M4 (with 425 hp) and perhaps more importantly, the Lexus RC F (with 450 hp). Related Video:

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