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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.

2016 Infiniti QX60 gets a facelift, Hybrid still alive

The future of the Infiniti QX60 Hybrid looked grim a few months ago, when Nissan confirmed the Pathfinder Hybrid was being discontinued. After all, the QX60 and Pathfinder are nearly identical underneath their different bodies. But with this 2016 model year refresh, Infiniti confirms that its QX60 Hybrid will indeed carry on for the new year. It's the same hybrid system as before, combining a supercharged, 2.5-liter inline-four with an electric motor for a combined 250 horsepower and 243 pound-feet of torque. New liquid-filled active engine mounts are added for 2016 in an effort to reduce overall harshness. Non-hybrid models carry on with the naturally aspirated 3.5-liter V6, good for 265 hp and 248 lb-ft. Front-wheel drive is standard with both engines, and all-wheel drive is optional. That's the biggest news for the updated QX60. Everything else baked in to the refresh is pretty standard. Up front, there's a new fascia that better aligns the seven-passenger crossover with every other Infiniti product, and the taillights are slightly more stylized than before. It looks nice, but there's still no hiding those Nissan Pathfinder bones. Infiniti says new shock absorbers and springs will help improve ride quality, and steering effort is improved with a retuned, speed-sensitive electronic power assist system. Standard, Sport, Eco, and Snow modes will help you manage the power depending on the weather and your driving style. We don't know how much this will actually improve the QX60's ride, but we never really had any problems with the luxury crossover's relaxed dynamics, anyway. Look for the QX60 to officially debut at the 2016 Detroit Auto Show, following a reveal at a media event this week. For the full details on all the super-nitty-gritty changes, check out the press blast below. Infiniti QX60 Premium Crossover Offers Enhanced Design, Dynamics, Comfort and Convenience for 2016 - Refreshed exterior design adds to premium look and feel - Chassis dynamics retuned for a more engaging, comfortable drive - Interior revisions bring enhanced luxury for up to seven occupants - Augmented suite of assistive and intuitive technologies NASHVILLE (Dec. 15, 2016) – Infiniti has comprehensively enhanced its versatile QX60 premium crossover for 2016, introducing a wide range of changes that improve the seven-seater's exterior design and its driving dynamics, while showcasing new features and technologies that improve comfort, convenience and safety.

Infiniti hybrid sports car coming by 2016 after all?

Infiniti makes plenty of good cars, crossovers and SUVs. The premium Japanese brand also has a well-defined presence in racing on the world's largest stage in the form of a partnership with Red Bull in Formula 1. What Infiniti doesn't have, though, is a range-topping halo car.
A report from Autocar in the UK suggests that Infiniti's gaping top-shelf hole may soon be plugged by 2016 with a new hybrid sports car along the lines of the well-received Emerg-E and Essence concepts. This report is contrary to news we heard from Autocar late last year, when company officials reportedly told the publication that a swoopy and fuel-efficient machine like the Emerg-E wouldn't be produced.
Interestingly, Infiniti is said to sense strong demand from so-called "little emperors ... who are used to getting what they want," many of whom live in Asian countries, who are also environmentally conscious. Infiniti exec Andy Palmer told Autocar to expect something "like the Tesla sports car option, but with more flexibility in terms of range."