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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 Juke-R pitted against Bugatti Veyron in brilliantly odd drag race

The Nissan Juke-R must've been a tough car to build a business case for, yet the madcap little crossover with the heart of a GT-R is now a production reality. Admittedly, we should probably assign some quotes around "production," since the vehicle is being built on a one-by-one on-demand basis at extraordinary cost - at an estimated price of well over $600,000, it has little in common with the already bonkers everyday Juke. We're just happy it exists at all.
With 545 horsepower, we also didn't figure it needed more power. But that apparently hasn't stopped the tuning community, which probably only had to adapt performance adders designed for the GT-R to the mechanically similar CUV. Thus, we end up with this mile-long drag race, which pits a Bugatti Veyron against a Juke-R prepared by an outfit called Shpilli Villi Engineering with a claimed 700 horsepower. That's still well down on horsepower versus the legendary quad-turbo supercar, but the much smaller Nissan also figures to be a lot lighter while boasting similar all-wheel-drive traction. We don't have much more information to go on other than this video, and it doesn't appear that both drivers necessarily got their best runs in, but it certainly makes for jaw-dropping watching. Check it out by scrolling below.

Trucks, SUVs — and Camry — shine in mixed U.S. January vehicle sales

DETROIT — Automakers posted mixed U.S. new vehicle sales data for January, with American consumers continuing to abandon passenger cars for the larger pickup trucks, SUVs and crossover models that manufacturers also love because they are far more profitable. Total industry auto sales for the month rose 1 percent versus January 2016. According to Autodata Corp, which tracks industry sales, the seasonally adjusted annualized rate (SAAR) of U.S. car and light truck sales in January fell to 17.12 million units from 17.44 million a year earlier. Analysts polled by Reuters had expected a January SAAR of 17.2 million units. U.S. auto industry sales fell 2 percent in 2017 to 17.23 million vehicles after hitting a record high in 2016 and are expected to drop further in 2018 despite a solid economy. Interest rates are rising and around 4 million late-model used cars will return to dealer lots this year to compete with more expensive new ones. Automakers have used consumer discounts to boost sales, a growing concern for observers who say this undermines resale values and profits. Discounts declined in January, but remained above 10 percent of manufacturers' recommended prices. ""I think the industry has accepted that (sales) volumes will fall somewhat in 2018 ... and I don't think the industry is going to go over the cliff with insane incentives," Mike Jackson, chief executive officer of AutoNation Inc, told Reuters after his company, the largest U.S. auto retail chain, posted a higher quarterly net profit. Mark Wakefield, head of the North American automotive practice for consultancy AlixPartners, had a gloomier perspective. The industry's less-than-stellar sales performance for January showed "we are now past the peak," he said. "Automakers are now selling the deal instead of the vehicle," he said. "That's a tough spot to be in because that treadmill is hard to get off once you're on it." General Motors January sales rose 1.3 percent, driven by a 16 percent rise in fleet sales. Sales to consumers fell 2.4 percent. GM posted strong gains for models such as the Silverado pickup truck and Equinox crossover model, while its passenger cars continued to struggle. Ford The Blue Oval posted a 6.6 percent sales decline for January, with retail sales down 4.3 percent. Sales of Ford's F-Series pickup trucks - America's best-selling vehicle brand for decades — rose 1.6 percent. Passenger cars were down more than 23 percent.