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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:

Assessing Sebastian Vettel's first 100 days as Infiniti's director of performance

Whenever a new US president is elected, we know to expect a performance review as soon as he (or she) has spent 100 days in office. Sebastian Vettel, arguably given a job that is more important to Infiniti than the US president, has been the brand's director of performance for one hundred revolutions of The Blue Marble, and Infiniti has put together a videographic glimpse of his work at Paul Ricard, in the US and England.
We probably won't really get a grip on the full results of his efforts for a while - we doubt that he's been in his post long enough to significantly alter the trajectory of the Q50 sedan, for instance. But then again, Infiniti insists he's been integral to the car's dynamics development regime, suggesting he's been working as a test driver for some time before these 100 days. Of course, Vettel is a race car driver and brand ambassador first and foremost, but when he tells a Q50 engineer that "For the future, I think it's more comfortable to have the shift paddles on the steering wheel," we get the sense that he won't hesitate to suggest changes in forthcoming products. Check out more of his inputs in the video below as well as a press release detailing his visit to the tech center in Cranfield, UK.

2019 Infiniti QX50 starts fresh with a new face and trick engine

Last week, Infiniti rolled out the refresh of the big daddy QX80 in Dubai. At this year's Los Angeles Auto Show, the Japanese automaker is poised to reveal something that's bound to be far more mainstream: the 2019 Infiniti QX50 and its trick variable compression turbocharged engine, or VC-T. In addition to the new engine, the QX50 drops rear-wheel drive in favor of an all-new front-wheel-drive platform and gets the new ProPilot assist technology that debuted on the Nissan Leaf. The QX50 may be the headliner, but the engine is the really interesting bit. This 2.0-liter turbocharged inline-four can adjust the stroke of the pistons on the fly, varying the engine's compression from 8:1 to 14:1, and giving the new midsize crossover improved efficiency and diesel-like torque. It's rated at 268 horsepower and 280 pound-feet of torque, down 57 horses but up 14 pound-feet. Front-wheel-drive models hit 60 mph in 6.7 seconds. That drops to 6.2 seconds with all-wheel drive. Combined fuel economy is 27 mpg for front-wheel-drive QX50s and 26 mpg for all-wheel-drive variants, both up from the abysmal 20 mpg combined rating of the current model. Power is sent through a continuously variable transmission. If it's like other Nissan and Infiniti CVTs, it will be inoffensive if a bit lifeless. We've covered the details of this powertrain extensively already, but it's great to see companies giving more life to the internal combustion engine. The new platform marks a big improvement over the outgoing QX50 in terms of platform rigidity and space efficiency. Rear-wheel drive might be fun, but it's never ideal from a packaging perspective. Cargo capacity is up from 31.6 cubic-feet to 37 cubic-feet. With the seats down, the space expands to 60 cubic feet, up from 50.1 cubic feet. That's not exactly class-leading, but it's no longer among the class-worst. The 2019 QX50 will use a new type of high-tensile steel, improving torsional rigidity by 23 percent and shaving overall weight. The styling falls in line with most other Infiniti products. The outgoing model had a bit of an identity crisis, looking more like a lifted wagon than a fully-realized crossover (it was, after all, essentially a G35/G37 wagon). This new one has much more conventional SUV proportions. In fact, it looks like a 7/8-scale version of the new QX80 with a front-wheel-drive profile. That's either good news or bad news, depending on where your tastes fall.