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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.

Race recap: 2015 British Grand Prix is a testament to timing

In front of his home crowd, Lewis Hamilton actually had to work for pole position at the British Formula One Grand Prix. The World Champion couldn't get on top of the setup for his Mercedes-AMG Petronas on Friday, lapping behind teammate Nico Rosberg and the two Ferraris. Come Saturday, after a few alterations and a whole lot of wing to clamp down on understeer, Hamilton returned to his regular program at the front, taking pole position by just over a tenth of a second from his teammate. Williams, thought to be headed for another stretch in the weeds a few races ago, showed its best strength all year. The Grove team got both cars on the second row and in front of the Ferraris, Felipe Massa qualifying ahead of teammate Valtteri Bottas, but they were eight and nine tenths behind the Mercedes'. Kimi Raikkonen out-qualified Ferrari teammate Sebastian Vettel for the second time this year, and only the first time in a straight-up battle with two healthy cars. But more than a second behind the two cars at the front, and with two nearly-impossible-to-pass Williams' in front, neither the Finn nor the German is happy with where they are. Daniil Kvyat claimed seventh, his side of the garage at Infiniti Red Bull Racing having got through the weekend to that point without a single complaint about their Renault power unit. Carlos Sainz, Jr. put a single Toro Rosso inside the top ten in eighth position, ahead of Nico Hulkenberg who did the same for Sahara Force India by slotting in ninth. The second Infiniti Red Bull driven by Daniel Ricciardo did have an unspecified engine complaint – his car kept "bleeding power" on the straights – but even so he managed to qualify tenth with his second-fastest lap. The stewards deleted his best lap because he ran three centimeters outside the track limits at Copse, an infraction that stung a few other drivers as well. Up in front, what would sting the Mercedes-AMG Petronas drivers the most was the start. That's when a dearth of grip struck both Hamilton and Rosberg, allowing Massa and Bottas to slide right up the middle between them and take the first two places. The leapfrogging was so surprising that it looked like the Mercedes drivers were giving the Williams drivers a head start. They diced through the first corners, Hamilton sliding past Bottas into second place halfway through the lap. And then the safety car reported for duty.

Infiniti spruces up Q70L Bespoke Edition for Shanghai [w/video]

"Luxury" is a relative term. Take the Infiniti Q70, for instance, which most of us would find plenty luxurious. But some buyers – in China especially – wanted more, so Infiniti stretched it out into the Q70L. And now it's revealed the even more luxurious Q70L Bespoke Edition. Revealed for the first time at the Shanghai Motor Show down the coast from the company's global headquarters in Hong Kong, the Infiniti Q70L Bespoke Edition is designed to "fill the gap between the current interiors in production cars and luscious interiors of Infiniti's concept cars." That's been materialized through a quilted white leather cabin space with four individual seats hewn "by meticulous craftsmanship and three-dimensional textures." It all looks pretty swank to us, but not the kind of space you'd want to put your kids in with their juice boxes, crayons and dirty soccer uniforms. Check it out in the video clip, high-res images and press release below. This content is hosted by a third party. To view it, please update your privacy preferences. Manage Settings. Apr. 19, 2015 Infiniti unveils Q70L Bespoke Edition at Auto Shanghai; joins Q60 Concept and Q80 Inspiration in show debut - Infiniti Q70L Bespoke Edition revealed with concept-car inspired interior - Q80 Inspiration and Q60 Concept vehicles also make China premieres - Infiniti design, plus Global and China growth, highlighted Hong Kong/Shanghai – Infiniti today took the covers off its Infiniti Q70L Bespoke Edition at Auto Shanghai 2015, showcasing its concept car-inspired interior for the first time in front of the predominantly Chinese crowd. The special version of the production Q70L, with a 5.9-inch (150 mm) longer wheelbase, features four luxurious seats wrapped in rich white quilted leather. This exploration is meant to fill the gap between the current interiors in production cars and luscious interiors of Infiniti's concept cars. Shaped by meticulous craftsmanship and three-dimensional textures, the cabin of the Q70L Bespoke Edition has been transformed into a cossetting space, hinting at how the artistry of Infiniti's concept cars can become reality. The production model of the Infiniti Q70, and two more Infiniti concepts – the Q80 Inspiration and Q60 Concept – were also making Auto Shanghai debuts.