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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.

Race recap: 2015 British Grand Prix is a testament to timing

In front of his home crowd, Lewis Hamilton actually had to work for pole position at the British Formula One Grand Prix. The World Champion couldn't get on top of the setup for his Mercedes-AMG Petronas on Friday, lapping behind teammate Nico Rosberg and the two Ferraris. Come Saturday, after a few alterations and a whole lot of wing to clamp down on understeer, Hamilton returned to his regular program at the front, taking pole position by just over a tenth of a second from his teammate. Williams, thought to be headed for another stretch in the weeds a few races ago, showed its best strength all year. The Grove team got both cars on the second row and in front of the Ferraris, Felipe Massa qualifying ahead of teammate Valtteri Bottas, but they were eight and nine tenths behind the Mercedes'. Kimi Raikkonen out-qualified Ferrari teammate Sebastian Vettel for the second time this year, and only the first time in a straight-up battle with two healthy cars. But more than a second behind the two cars at the front, and with two nearly-impossible-to-pass Williams' in front, neither the Finn nor the German is happy with where they are. Daniil Kvyat claimed seventh, his side of the garage at Infiniti Red Bull Racing having got through the weekend to that point without a single complaint about their Renault power unit. Carlos Sainz, Jr. put a single Toro Rosso inside the top ten in eighth position, ahead of Nico Hulkenberg who did the same for Sahara Force India by slotting in ninth. The second Infiniti Red Bull driven by Daniel Ricciardo did have an unspecified engine complaint – his car kept "bleeding power" on the straights – but even so he managed to qualify tenth with his second-fastest lap. The stewards deleted his best lap because he ran three centimeters outside the track limits at Copse, an infraction that stung a few other drivers as well. Up in front, what would sting the Mercedes-AMG Petronas drivers the most was the start. That's when a dearth of grip struck both Hamilton and Rosberg, allowing Massa and Bottas to slide right up the middle between them and take the first two places. The leapfrogging was so surprising that it looked like the Mercedes drivers were giving the Williams drivers a head start. They diced through the first corners, Hamilton sliding past Bottas into second place halfway through the lap. And then the safety car reported for duty.

2015 Brazilian Grand Prix is the same as it ever was

At this point, we hope Nico Rosberg is planning to carry his current qualifying form into the 2016 season and back it up with the same kind of race-day cojones he showed winning the race in Mexico City two weeks ago. The Mercedes-AMG Petronas driver got it right enough again on Saturday afternoon to take his fifth consecutive pole position ahead of teammate Lewis Hamilton by almost a tenth of a second. It's the same one-two from Brazil last year. The bad news for the rest of the field is that the winner in Brazil the last seven years has been one of the two drivers on the front row. Last year it was the Williams duo that lined up behind Mercedes, this year it's Ferrari. Sebastian Vettel plays the stalking horse, securing third in his Ferrari ahead of teammate Kimi Raikkonen in fourth. Williams driver Valtteri Bottas actually qualified in fourth, but he had to serve a three-spot grid penalty for passing under red flags in Free Practice 2, so he started sixth. That promoted Sahara Force India driver Nico Hulkenberg up to fifth. Daniil Kvyat was the quickest representative from Infiniti Red Bull Racing, getting into seventh even with a Renault power unit that's weak on some of the key stretches at the Interlagos track. Felipe Massa had the second Williams in eighth, in front of the second Red Bull driven by Daniel Ricciardo in ninth. Toro Rosso hasn't confirmed its drivers for next year but Max Verstappen keeps making it hard to look elsewhere, taking 10th. Rosberg is working nearly the same trick he pulled last year: drive like a second driver for most of the year, drive like a world champion for the last quarter of a season. He pulled away at the start and covered Hamilton just enough on the run to the first corner to keep Hamilton on the outside. By the end of Turn 1 the German had the lead and didn't give it up for the rest of the race outside of pit stops. Without overwhelming pace to pass and unable to follow closely, Hamilton could do nothing except ask his team for a different strategy to go for the win. When Mercedes told him "No," trying to protect Rosberg's second place in the championship ahead of Vettel, that was the race. Just like last year, Rosberg and Hamilton finished one-two. Vettel, Raikkonen, Bottas, Hulkenberg, and Kvyat drove lonely races to finish in positions three through seven.