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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.

The Infiniti QX80 Monograph concept is fully revealed ahead of New York

The big Infiniti QX80, the largest SUV in the company's range and related to the Nissan Patrol sold around the world, is frankly in need of a facelift. The last time the big lug went under the knife was in 2014, and it was a pretty mild nip and tuck. The aging SUV was never much of a looker anyways, although it is certainly distinct. The Monograph concept, which is coming to the New York Auto Show next week, is a preview of where the QX80 is headed. And as we saw in the teaser last week, this styling direction is an improvement. The headlights migrate higher on the front fascia, making the thing look a little less like a sad porpoise and more like a tech-heavy SUV with serious presence. Some of this is simply concept car fantasy, sure – note the lack of mirrors, a favorite concept car trope that'll be replaced by real mirrors for production. But as Infiniti says, the concept "illustrates how the design of INFINITI's QX80 could evolve". Translation: expect the general shape and overall styling to make it to a production vehicle, unless somehow this concept gets roundly panned at the show. Since it seems to be an inarguable improvement over the current vehicle, the inevitable march towards production seems assured. Related Video: Design/Style New York Auto Show Infiniti SUV Luxury infiniti qx80 infiniti qx80 monograph

Infiniti QX55 spied for the first time looking sleek

The Infiniti QX55 is well on its way to joining the crossover coupe ranks in 2020, and here’s our first view of the car out testing. Infiniti is expected to debut the ‘ute in the first half of 2020, so it wonÂ’t be long till we see it without the swirls and body cladding on it, too. As the name suggests, the QX55 is a derivative of the QX50 crossover, which was just completely redesigned for the 2019 model year. Infiniti debuted its new VC-Turbo (variable compression) engine technology in that crossover, and itÂ’ll certainly be along for the ride in the QX55 as well. The latest teaser suggested that Infiniti would be greatly differentiating this crossover coupe to the rest of the field by giving it a uniquely long tail for more cargo space. That tail still exists on the vehicle caught out testing, but it doesnÂ’t look drastically different than other vehicles of its ilk. To that end, rear cargo space is likely to be slightly down from the more traditionally shaped QX50, even if itÂ’s slightly better than competitors. However, rear seat space appears to be better than expected. The roof itself doesnÂ’t taper at a horribly steep angle into the rear passengerÂ’s heads, and the rear windows are large enough that they may only cause minor claustrophobia. Most of everything except for the rear end will likely resemble the QX50 verbatim, so itÂ’s just the back half that weÂ’re waiting for in the reveal. The grille itself has the same waveform shape as the normal QX50, and the body creases in the hood and doors protruding through the skin-tight camo resemble it as well. Even the wheels on this tester are exactly the same design as the rollers used on the production QX50. When it does come out, the QX55 will join its German competition in this stylish but utility-hampered segment. The BMW X4 and Mercedes-Benz GLC Coupe will be the main targets when we expect this car to hit dealer lots later this year. Related Video: