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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 QX55 spied for the first time looking sleek

The Infiniti QX55 is well on its way to joining the crossover coupe ranks in 2020, and here’s our first view of the car out testing. Infiniti is expected to debut the ‘ute in the first half of 2020, so it wonÂ’t be long till we see it without the swirls and body cladding on it, too. As the name suggests, the QX55 is a derivative of the QX50 crossover, which was just completely redesigned for the 2019 model year. Infiniti debuted its new VC-Turbo (variable compression) engine technology in that crossover, and itÂ’ll certainly be along for the ride in the QX55 as well. The latest teaser suggested that Infiniti would be greatly differentiating this crossover coupe to the rest of the field by giving it a uniquely long tail for more cargo space. That tail still exists on the vehicle caught out testing, but it doesnÂ’t look drastically different than other vehicles of its ilk. To that end, rear cargo space is likely to be slightly down from the more traditionally shaped QX50, even if itÂ’s slightly better than competitors. However, rear seat space appears to be better than expected. The roof itself doesnÂ’t taper at a horribly steep angle into the rear passengerÂ’s heads, and the rear windows are large enough that they may only cause minor claustrophobia. Most of everything except for the rear end will likely resemble the QX50 verbatim, so itÂ’s just the back half that weÂ’re waiting for in the reveal. The grille itself has the same waveform shape as the normal QX50, and the body creases in the hood and doors protruding through the skin-tight camo resemble it as well. Even the wheels on this tester are exactly the same design as the rollers used on the production QX50. When it does come out, the QX55 will join its German competition in this stylish but utility-hampered segment. The BMW X4 and Mercedes-Benz GLC Coupe will be the main targets when we expect this car to hit dealer lots later this year. Related Video:    

A look inside Infiniti's variable-compression engine

We're sympathetic to anyone who had trouble understanding what's going on with Infiniti's new variable-compression engine. While we got a full tech briefing on the novel VC-Turbo back in August, the visual aids were lacking. The cutaway engine Infiniti brought to the Paris show fixes all of that. You can thank the little green and pink lines on the cutaway for making the whole idea a little more clear. Click through the gallery to see two lines – one green and one pink – that represent the different strokes allowing for different compression ratios. Remember, the compression ratio is the amount of volume in the cylinder on intake compared to the amount at the end of the compression stroke. Leave more room at the end and you lower that ratio. The length of the stroke doesn't change with this system, but where it sits along the cylinder does. Hence those two lines. The variable compression ratio allows this new turbocharged engine to maximize fuel economy when the turbo isn't needed by raising the compression ratio. It will see its first use in the next Infiniti QX50 crossover, previewed by the QX Sport Inspiration concept that's also on display in Paris, and has performance targets of 268 horsepower and 288 pound-feet of torque. After, it will migrate to other Infiniti and Nissan vehicles, with transverse front-drive-based applications first in line. Eventually, it's likely to completely replace Nissan's corporate 3.5-liter V6. We'll be poking around the engine a little more in Paris today to try and get some more info. For now, enjoy those cutaway images and those friendly little lines. Featured Gallery Infiniti VC-Turbo engine cutaway View 14 Photos Paris Motor Show Infiniti Nissan Technology Emerging Technologies engine 2016 paris motor show