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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.

Infiniti is blazing an unconventional path to electrification

When it comes to electrification, Infiniti has a history of speaking a great deal but doing little. The Nissan-owned company's plug-in offensive will start in the 2020s, and it provided preliminary details about the technology that motorists can expect to find in showrooms in the not-too-distant future. Eric Rigaux, Infiniti's general manager of product strategy and planning, told Roadshow the firm's engineering department is putting the final touches on two forward-thinking electrified powertrains. The first one will run solely on electricity, while the second one will rely on a gasoline-powered generator to provide more range. Both are being developed to fit into a flexible new platform. Technical details about the electric setup remain vague, so we don't know how big of a battery pack Infiniti will use, or how many motors will draw electricity from it. However, Roadshow learned the gasoline-electric layout will never need to be plugged in, because a 1.5-liter, three-cylinder engine equipped with Infiniti's innovative variable-compression technology will produce the electricity it needs to run. The triple won't directly spin the wheels; it will channel the juice it creates to a battery pack. It's not a zero-emissions solution, but it's one that makes a lot of sense, because users won't need to wait for a charge, and they'll be able to drive for about 500 miles between fill-ups. The now-defunct Chevrolet Volt featured a similar drivetrain, but owners had the possibility of plugging it in. Infiniti won't give motorists that option; there won't be a plug anywhere on the car. Fluid-filled motor mounts and active noise cancellation will ensure the passengers don't feel or hear the triple whirring away. Meanwhile, two electric motors (one over each axle) will deliver between 248 and 429 horsepower; final specifications haven't been signed off yet. And, because power will come from gasoline, there's no need to integrate a bulky battery pack into the chassis. Infiniti's future gasoline-electric models won't require anything bigger than a 5.1-kilowatt-hour unit, which can unintrusively be stuffed under the trunk floor or sandwiched between the floor and the rear seat. Infiniti chose a crossover to inaugurate its battery-electric powertrain; the QX Inspiration concept (pictured) unveiled during the 2019 Detroit Auto Show shed light on what the model will look like.

Infiniti Formula One-inspired Q60 Project Black S has been canned

Infiniti gave enthusiasts a preview of what a high-performance hybrid coupe equipped with Formula One-derived technology could look like when it released the Q60-based Black S concept in 2017. While executives hinted the 563-horsepower model could reach production sooner rather than later, the company confirmed it's been axed. Industry trade journal Automotive News learned the concept was consigned to the automotive attic from an Infiniti spokesman. He pointed out the design study "continues to inspire us," but he didn't explain why the Black S won't reach production. We're not surprised by the decision, though. It was a complex, eye-wateringly expensive version of a slow-selling model unveiled in 2015. Making the numbers add up was likely easier said than done.  Interestingly, many Infiniti dealers didn't want the Black S. "In today's market, a premium Japanese performance coupe has to be very low volume. Anything that Infiniti produces for its dealers, we want it to be a volume product. We're not really in the racing business. I would much rather see something like the QX60. That's a volume vehicle, that's where this company needs to go," opined Ed Lennon, the chairman of the Infiniti National Dealer Advisory Board, in an interview with Automotive News. Unveiled at the 2017 edition of the Geneva auto show, and presented again the following year in Paris, the Black S was powered by a gasoline-electric hybrid drivetrain built around the twin-turbocharged, 3.0-liter V6 that powers the Q60 Red Sport 400. It worked with three motor-generator units similar to the ones found in the Kinetic Energy Recovery System (KERS) fitted to Formula One cars. One spun the rear wheels, and the others were connected to the turbochargers to eliminate lag and deliver instant boost. Infiniti quoted a sub-four-second sprint to 60 mph. Hybrid technology adds weight, and Formula One-like components are no exception. Infiniti noted the drivetrain weighed 441 pounds more than the Red Sport 400's V6. Had it been built, the Black S would have relied extensively on carbon fiber to keep weight in check, and it would have offered a 50/50 weight distribution. Much has changed since 2017, however. Roland Krueger, the former Infiniti CEO who championed the project, left the company in January 2019 to lead Dyson's ill-fated automotive unit. Infiniti announced plans to exit the European market later that year, and it ended its participation in Formula One in 2020.