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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:

New details emerge on Inifiniti QX50’s unique new variable-compression engine

Infiniti will release the world's first production variable-compression engine when it releases the 2019 QX50 midsize SUV sometime next year. Now we have some new details on the innovative new engine, which Infiniti is calling VC-T, for Variable Compression Turbo, after the luxury brand offered a prototype test drive. We wrote extensively about the complicated technology underpinning the new engine last year. It's the latest novel development that could represent a range-extender, if you will, for the embattled internal combustion engine in an era when automakers and governments are shifting their focus to electric vehicles. The VC-T is a new inline-four, 2.0-liter that combines the power of a high-performance turbo gasoline engine with the torque and efficiency of an advanced diesel engine, but without the latter's notorious emissions. It features the ability to seamlessly raise or lower the stroke of the pistons in the combustion chamber, depending on the driving conditions it detects and inputs from the driver, to select the best compression ratio—anywhere between 8:1, typical for high-performance engines, and 14:1 for high efficiency. In essence, it delivers the performance of a V6 but is much more efficient, with improved fuel efficiency of between 10 to 15 percent with its best competitors, per Car and Driver. You can view how it works in motion via the video below. This content is hosted by a third party. To view it, please update your privacy preferences. Manage Settings. It's also quieter, more lightweight and compact than V6 engines with comparable power outputs, estimated at 268 horsepower and 288 pound-feet of torque. In a prototype test drive, Car and Driver writes that the engine "felt very conventional" and responsive, with strong and smooth acceleration. "The only indication you have that the compression ratio is changing is from an indicator in the instrument cluster next to the boost gauge." The engine is expected to deliver fuel economy gains of 27 percent in combined city-highway EPA rating over the outgoing QX50, which had a 3.7-liter V6. The 2019 model, fitted with the VC-T, should get about 26 mpg in combined fuel economy, and it will get to 60 mph almost one second faster than its four-cylinder counterparts, Nissan's chief powertrain engineer, Shinichi Kiga, told Automotive News. The VC-T engine is the result of 20 years of development spanning more than 100 prototypes and around 300 patents at Nissan.

Production Infiniti QX30 coming to LA Auto Show

Infiniti showed its QX30 small crossover in concept form at this year's Geneva Motor Show, and now, we've got confirmation that the production car will debut in Los Angeles. But this is just one of some 30 global reveals that will take place at the LA Auto Show this November. The QX30 will be a higher-riding version of the new Q30 hatchback that we'll see in Frankfurt later this month. And since the Q30 shares a lot of its underpinnings with the Mercedes-Benz A-Class, we can probably expect the QX30 to be a sort of Infinitized GLA-Class. Just picture a lifted version of the production Q30 we've already seen in teaser shots. In addition to 30 global debuts, the LA Auto Show will host 20 North American reveals, including the Jaguar F-Pace, Kia Sportage, and Bentley Bentayga that will initially be shown in Frankfurt. The only other LA show global reveal we know about right now is the 2016 Hyundai Elantra. Still, there will no doubt be a lot to talk about come November, with Alfa Romeo, BMW, Bentley, Fiat, Ford, General Motors, Honda, Jaguar Land Rover, Mazda, Mercedes-Benz, Mini, Mitsubishi, Nissan, Porsche, Subaru, and Volkswagen all confirming that they'll have something to show in Los Angeles. Naturally, we'll be on site with our usual obsessive auto show coverage. Related Video: THIRTY WORLD DEBUTS CONFIRMED FOR 2015 LOS ANGELES AUTO SHOW 50 total reveals expected and will be streamed live by CNET from the show floor LOS ANGELES, CA (September 2, 2015) – The Los Angeles Auto Show (LA Auto Show®) announced today that 30 world debuts, totaling 50 vehicle unveilings overall, will be introduced in front of media, analysts and automotive industry executives during its Press & Trade Days, November 17-19, 2015. Almost every manufacturer will be making news, and while most have yet to announce details, a few manufacturers have begun to share their debut plans. Specifically, Infiniti will have a global reveal of its all-new QX30 crossover and Hyundai will host the world premiere of its all-new Elantra. Other debuts include Jaguar's first luxury SUV, the F-PACE, and Kia's next generation Sportage. Other automakers officially confirming premieres include Alfa Romeo, BMW, Bentley, Fiat, Ford Motor Company, General Motors, Honda, Jaguar Land Rover, Mazda, Mercedes-Benz, MINI, Mitsubishi, Nissan, Porsche, Subaru and Volkswagen.