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Infiniti's variable compression engine in the 2019 QX50 is the first of its kind

The world's first variable compression ratio engine is here, in a production car. That car is the 2019 Infiniti QX50, debuting this week at the Los Angeles Auto Show. The midsize crossover has seen a refresh that has brought it an all-new platform together with new driver assist features, but it's the engine that's the centerpiece here. Nearly everything is continuously variable under the hood of the QX50 – not only the new shift-by-wire XTRONIC CVT. The new VC-Turbo gasoline engine is able to change its compression ratio from 8:1 to 14:1, or anything in between depending of the driving situation; whether there is need for top-end power or turbodiesel-like torque from low revs, or optimized fuel economy. The pistons' reach is continuously adjusted by an electric "Harmonic Drive" motor, which controls a multi-link system, affecting the top-dead-center of the pistons and changing the compression. The engine can also switch between efficiency-maximizing Atkinson cycle and regular combustion cycle, on the go – and there's both multipoint injection and gasoline direct injection employed. The result is 268 horsepower at 5,600 rpm and 280 pound-feet of torque at 4,400 rpm; good figures for a 2.0-liter four-cylinder gasoline engine with a single-scroll turbocharger. Infiniti says that the FWD version's fuel economy of 27 miles per gallon combined is 35-percent better than the previous-generation V6 engine; in AWD guise, it reaches 26 mpg, which is a 30-percent improvement. The new engine is pretty much all-aluminum, but the vaguely magical-sounding "transformative multi-link components" behind the variable compression system are made from high-carbon steel alloy. The engine's multi-link system also enables it to do away with any balancing shafts, and Infiniti compares its smoothness to a V6 rather than a regular four-cylinder. In addition to the aforementioned tech, the VC-Turbo engine has the world's first active engine mount vibration damping system to smoothen its operation even further. Related Video:

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 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.