2006 Infiniti M45 Sport Sedan 4-door 4.5l on 2040-cars

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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:

4 ways Infiniti’s Q Inspiration concept bridges present and future

Infiniti's new Q Inspiration concept is a striking fastback sedan that the company says reflects an inflection point for both the luxury brand and the broader auto industry itself. It represents a bridge between technologies. That's true in the literal sense; it employs Infiniti's new variable compression turbocharged engine technology, which provides performance features while maximizing efficiency, and bridges the gap to more advanced powertrains. It also features Nissan's ProPilot semi-autonomous driving technology. But it's also true for the concept car's design, which Infiniti says provides a simple, elegant solution to complex technological questions — offering a palate cleanser, if you will, for the complicated technologies hidden beneath the gleaming surfaces. Oddly enough, the futuristic-looking Q Inspiration owes a debt of gratitude to the Prototype 9, the concept based on a 1940s-style grand prix car that Infiniti released last year. Alfonso Albaisa, Infiniti's senior vice president for global design, said that project became "a kind of a blank canvas for us to play with" and allowed for new discovery and expression with minimal brush strokes. It also led designers back to Ma, the Japanese concept of mastery of empty space. We spoke with Albaisa about how the concept's design echoes the theme of bridging the present and future. 1. The cabin's forward proportion and roominess Using the space-efficient VC-Turbo engine gave the designers space to shift the cabin forward and move the A-pillars back, creating a more centered and elongated cabin, with maximum headroom. The interior is clean, with orange and black leather with orange accents and backlit birch wood accents. The center console is floating, providing seamless connectivity to technology and hiding mechanical elements. Albaisa says it's the first manifestation of Infiniti's new form language for an era of advanced powertrain and future technologies. 2. The grille In what Albaisa describes as "a little bit of an accident" and "kind of tongue-in-cheek," the Q Inspiration's grille is a kind of trompe l'oeuil phenomenon. From directly in front, you can see the small fins, but viewed from the side, they disappear. So much so that Albaisa said he was initially fooled. "From a functional point of view, we need to breathe," he said. "But I think in the future, where there'll be a lot different types of technology, probably the car can breathe less. So we don't need that dominating big open mouth.

Infiniti Qs Inspiration shows itself before Auto Shanghai

Infiniti's shown off a bit of the Qs Inspiration concept before debuting the creased contrivance at Auto Shanghai next week. The concept serves a few purposes, the first to reimagine a future for sports sedans on a planet of crossovers and SUVs. The result blends a fastback with high sides that connect low ground clearance below and an elevated seating position above. The Japanese luxury maker is all about sedans, the Qs Inspiration signaling how a carmaker watching the bottom line can maintain its interest in the passe bodystyle. The concept previews a production model, and perhaps the design language and lingo we'll see spreading through the range. We're not sure how the low floor and higher roof work out in the cabin, but Infiniti mentions a "low-mounted powertrain and potent e-AWD system." That's undoubtedly the promise of the "all-new flexible architecture developed to accommodate high-performance electrified powertrains." Production-izing for a non-electric version would mean laying in a grille for the ICE, but an electrified version would have plenty of room for batteries and e-motors. Before that retail model, it's possible we'll see Qs Inspiration cues on the Q50 and Q70 sedans. Take a long gander at the profile and the way the roof slopes, and you'll notice an elongated GT-R glasshouse profile. On top of that, before Infiniti released official photos, a few images leaked from China showing other angles of the concept. The rectangular steering wheel and massive digital dash cluster probably aren't going anywhere beyond Shanghai, but if Infiniti can bring that glass roof to production, that's a win in our book.