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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:

Infiniti Q60 to pack upwards of 400 horsepower

Infiniti turned heads when it unveiled the Q60 Concept at the Detroit Auto Show last month. While the concept coupe was revealed with a new 3.0-liter twin-turbo V6, the Japanese luxury automaker didn't indicate how much power it would produce. But now we may have our first indication. Speaking with an unidentified source at Infiniti during the Canadian International Auto Show in Toronto, AutoGuide reports that the production Q60 will arrive late in 2016 and pack at least 400 horsepower. A higher-output version of the same engine, however, could produce as much as 450 hp. That would still be significantly less than the Q50 Eau Rouge, which packed the larger 3.8-liter twin-turbo V6 from the Nissan GT-R with 560 hp. It would put it right on pace with the likes of the BMW M4 (with 425 hp) and perhaps more importantly, the Lexus RC F (with 450 hp). Related Video:

2017 Infiniti QX30 First Drive

If you've heard anything before about this car, the 2017 Infiniti QX30, it probably has to do with its corporate parents, an odd couple if there ever was one. Renault-Nissan, Infiniti's corporate overlords, inked a deal with Mercedes-Benz to share some mechanical components and platforms. That deal put a new, very modern 2.0-liter turbocharged inline-four under the hood of the Q50 and was the genesis of what you're looking at here. What are you looking at here? We drove this car in 2015, when it was called a Q30 – originally it was going to be the lower-riding counterpart to the slightly jacked-up QX30. Then Infiniti decided it'd make more sense to sell all variants of this vehicle as CUVs in the US, so we have three slightly different flavors of the QX30 instead. There's the normal version; the Sport, which is 0.6 inches lower; and the AWD, which is 1.2 inches higher. Infiniti brought us to Seattle to sample the Sport and AWD flavors on a semi-circumnavigation of the Puget Sound. It didn't rain a drop, thanks for asking, and instead was sunny and mild the whole time. It's easy to make the QX30 sound more confusing than it actually is. This is essentially a Mercedes-Benz GLA250 with full exterior styling and partial interior design by Infiniti, built in the UK alongside several other Nissans. The powertrain and chassis, including the optional AWD system, were all "co-developed" with partner Daimler, with final calibration and tuning by Infiniti engineers. Here's another way of explaining it: Infiniti needs an entry-level car to appeal to new premium car shoppers, and the QX30 is the prescription. It's a hatchback that's been given the mildest of CUV treatments and a lot of marketing descriptors. That's because hatchbacks are sales death in America. In Europe, they'll see right through the CUV posturing and realize it's just a hatchback offered in three different suspension heights. Whatever you call it to make it palatable to Americans, it's a useful little vehicle. This car is mechanically identical to the Q30, so there are some things we can gloss over. Both are powered by a transverse-mounted 2.0-liter Mercedes inline-four. It's a turbocharged, direct-injection gasoline engine, and it sure feels like one. It sounds like a rock tumbler full of nickels and runs out of breath at about 5,000 rpm. All versions make 208 hp at 5,500 rpm and 258 lb-ft of torque between 1,200 and 4,400 rpm – more than adequate but less than thrilling.