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Mazda Skyactiv-X Review | The revolution begins with a squeeze-bang

The matte black Skyactiv-X prototype looks like a rough Mazda3, perhaps reconstructed after a bad wreck by an over-enthusiastic owner of a spot welder and lots of gaffers' tape. Ribbed ducts poke out of the dash sending two breaths of conditioned air to no one in particular. Even its revolutionary engine, the thing we're here to experience, is entombed in a massive, nondescript cover to mask its unseemly noises. It's a wild, strange way to meet a very unconventional vehicle that promises diesel-like fuel economy, a wide torque band, and an exotic method for burning less gas than ever before. It takes a few hours for Mazda's engineers to explain the fundamental principles of operation. For more detail, read our Skyactiv-X Spark Controlled Compression Ignition explainer, but here's a very brief overview. Skyactiv-X marries some traditional gasoline engine characteristics with a novel form of compression ignition called SPCCI. The key for Skyactiv-X is to use very high compression in the cylinder and an extremely lean fuel-air mixture. Squeezed right to the cusp of getting hot enough to blow up all on its own (which is very hard to predict), a squirt of extra gas and a spark interject to cross that compression-ignition threshold in a controlled and predictable manner. See the animation below: That takes a few essential components to get just right. One is a massive amount of computer processing power and some pressure sensors in the individual cylinders, because the ambient conditions change how and when these things happen. Skyactiv-X uses a clutched supercharger to pump in additional air when needed to nail the mixture precisely, and high-pressure injectors to get the low ratios of fuel to disperse properly in the chamber. And since it operates like a conventional gasoline engine sometimes, it uses valve timing to lower the very high compression ratio so it doesn't reach combustion ignition in that mode. In practice, the Skyactiv-X runs in compression ignition mode most of the time. In practical terms, that means it drives like a torquey gasoline Skyactiv engine. The torque curve is broad and flat — diesel-like in that respect. That also means it can get away with using a six-speed transmission and a lower final drive for better response. There's enough grunt and economy together that Mazda can let the engine spin faster — at 60 mph, it's running at roughly 1,000 more RPM than a similar gas engine, with greater efficiency.

AWD Mazda6 or Mazda3? That could be a thing, but there's a problem

We wanted a stronger engine in the Mazda6, and last week at the L.A. Auto Show we got one, Mazda's turbocharged 2.5-liter four. (Though some of us wanted a manual transmission with it, but didn't get that.) And now we learn that apparently a lot of us would like to have all-wheel drive in Mazda's sedans. That might be a tough ask, but Mazda says it hears us. In an interview with CarAdvice, Masahiro Moro, Mazda North America's president and CEO, said there's a big demand in the U.S. for AWD, so Mazda's looking into it. Ah, but maybe we can't have everything. "I think we are not able to combine four-wheel drive and the 2.5-liter turbo. We have a layout issue with the sedans, that's why a four-wheel drive isn't deployed on the Mazda 3 and 6 so far," Moro said. "But there is a huge demand, at least what I know is that in the East Coast of the USA, 80 or 90 percent of premium sedans are sold with all-wheel drive." And with Mazda going upscale, it only makes sense to give upscale, performance-oriented customers what they want, like the AWD sedans the German premium brands have been offering for years. "Four-wheel drive becomes a premium cue for U.S. consumers," said Moro, "and obviously I have asked our R&D department to think about how we can accommodate four-wheel drive capability in the future." Though the CX-9, being a crossover, of course has AWD in combination with that turbo engine, it simply must not have the platform limitations of the sedans. And all-wheel drive in the Mazda6, at least, has been available in Japan, Europe and Australia, but paired with the Skyactiv-D and another smaller engine, diesels we don't get here. Moro's statement leaves open the possibility of AWD with the base 2.5-liter engine, but maybe not. Besides, a premium buyer would want the turbo. So, when Moro says the future, he means not now, not in the Mazda6 facelift we just saw. But maybe in the next big redesign? Or maybe the configuration problems will be easier to overcome when working with the innovative new 2.0-liter Skyactiv-X compression-ignition engine that's expected in the 2019 Mazda3. Related Video: This content is hosted by a third party. To view it, please update your privacy preferences. Manage Settings. Featured Gallery 2018 Mazda6: LA 2017 View 16 Photos Image Credit: Drew Phillips / Autoblog Auto News Mazda Technology Emerging Technologies Performance Sedan

Mazda RX-Vision Concept revives the rotary

Mazda continues fighting to keep the rotary alive, and with the RX-Vision concept at the 2015 Tokyo Motor Show, the company unveils its dream for the engine's revival in a curvaceous sports coupe. Before any fans burst with excitement at the prospect, Mazda only "hopes" to have this gorgeous shape available in showrooms someday, for now. The RX-Vision starts with the classic elements of a front-engine, rear-wheel drive sports coupe by combining a long, low hood, short rear deck, and a passenger compartment way at the back. From there, Mazda's stylists add the swooping touches of the brand's Kodo design language. The result looks thoroughly modern and still subtly evokes generations of the RX-7 in the sculpted fenders and flowing roofline. Under that shapely hood hides Mazda's next-generation rotary, which the company has dubbed the Skyactiv-R. Unfortunately, details about it are quite scarce at the moment, including the displacement or even the number of rotors the engine uses. Still, Mazda is abundantly clear that development of the mill is very much moving forward. Mazda's designers opt for a retro flair inside with the deeply dished steering wheel and gauges in three pods. The rest is simple and elegant with a minimalist, metal gearshift rising from the center console and leather straps for door pulls. Finishing things off is a clean mix of red and black upholstery with a little carbon fiber for contrast. Expect live shots from Tokyo soon to show how the RX-Vision looks under the lights. Related Video: Mazda Reveals Mazda RX-VISION Concept -- Powered by next-generation rotary engine SKYACTIV-R, represents Mazda's vision of the future -- HIROSHIMA, Japan—Mazda Motor Corporation unveiled the rotary-powered Mazda RX-VISION sports car concept at the Tokyo Motor Show*1 today. The rotary engine is a symbol of the company's "never-stop-challenging" spirit. RX-VISION represents a vision of the future that Mazda hopes to one day make into reality; a front-engine, rear-wheel drive sports car with exquisite, KODO design-based proportions only Mazda could envision, and powered by the next-generation SKYACTIV-R rotary engine. Rotary engines feature a unique construction, generating power through the rotational motion of a triangular rotor. Overcoming numerous technical difficulties, Mazda succeeded in commercializing the rotary engine, fitting it in the Cosmo Sport (known as Mazda 110S overseas) in 1967.