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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 QX80 Monograph: Not just luxury, 'upscale luxury'

We've been getting a slow rollout of news about the new Infiniti QX80 Monograph mega-SUV for the past week or two, and Infiniti provided more details Tuesday about its concept car at the New York Auto Show, saying the mega-SUV is a combination of "luxury with a commanding presence" and "the ultimate expression of futuristic luxury SUV design." Infiniti says the car embodies, not just luxury, but "upscale luxury." The company says the concept's design language incorporates a mix of geometric and organic shapes, including character lines and aluminum trim that were actually intended to make the big SUV appear even bigger than it actually is, which is more than five meters long, so perhaps 17 feet, more than 6 feet wide and about 6 feet tall. The most striking features are the headlamps, which become long, slender lines that wrap around the front corners, then taper into light bars that end at the doors in sculptured rear-view cameras in lieu of side mirrors. The car also has large, functional fender vents to divert air to the engine, and despite all that luxury it is still SUV enough to have an underbody cover protecting the underside - and improving aerodynamics. Likewise, an aerofoil between the tailpipes is said to improve airflow in the SUV's wake. It's a big, beautiful rig. Cue the beauty roll above and gallery below: View 12 Photos Related Video: Related Gallery Infiniti QX80 Monograph View 15 Photos Image Credit: Live photos copyright 2017 Drew Phillips / Autoblog.com Design/Style New York Auto Show Infiniti SUV Luxury 2017 new york auto show infiniti qx80 infiniti qx80 monograph

2025 Infiniti QX60 ditches V6, gains VC-turbo

The 2025 Infiniti QX60 will ditch its long-running VQ-series V6 in favor of Infiniti's variable-compression turbo engine. There's news beyond the powertrain overhaul too as the 2025 model sees some equipment upgrades and a new Black Edition. The blackout package is not new to Infiniti, but it's a first for this QX60. Let's start under the hood.  With 268 horsepower and 286 pound-feet of torque, the VC-T four-cylinder gives up 22 horses in exchange for 16 lb-ft of torque. That's a bit of a side-grade rather than an upgrade, perhaps, but the new four-cylinder delivers better fuel economy, making the whole pill a bit easier to swallow. The FWD model will return 22 mpg city, 28 mpg highway and 24 mpg combined, the EPA says (vs. 21/26/23 with the V6) while the AWD model improves to 22 mpg city, 27 mpg highway and 24 mpg combined (from 20/25/22). That's a 10% bump in city mileage vs. the V6 — not earth-shattering, but not bad, either. And we know what you're thinking, but fear not; this doesn't mean the QX60 is now saddled with a CVT. The nine-speed auto carries over and yes, it can still pull 6,000 pounds with AWD and the tow package.  For 2025, all QX60s get a new fob with an optional automatic lock/unlock feature. The Black Edition (see the gallery above) will be available on Luxe models and includes the gloss black wheels, grille surround, roof rails and exterior badges; illuminated front and rear kickplates; "radiant" grille badge; welcome lighting and a black headliner. The base price of the Pure model is up just $550 from 2024, however the FWD variant of the Autograph has been dropped, making it $4,300 more expensive to get into the trim. However, the AWD variant only increases by $50. Here's pricing information for the entire 2025 QX60 lineup with front-wheel drive (including destination). AWD is $2,000 more on every trim but the Autograph, which bakes it in as standard equipment for 2025.  Pure: $51,550 Luxe: $58,150 Sensory: $60,450 Autograph: $67,500 Related Video:  2023 Nissan Pathfinder Rock Creek walkaround This content is hosted by a third party. To view it, please update your privacy preferences. Manage Settings.