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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.

Mazda rumored to bring rotary-powered RX-9 concept to Tokyo

Stop us if you've heard this one before: Mazda will bring a rotary-powered sports car to the next big auto show. Okay, so we stopped for a second, but the show must go on. Following an official teaser image (shown above) late last month, Motoring.com.au has what it claims are renderings of the curvy, two-door coupe – called the RX-9 – that Mazda will bring to the Tokyo Motor Show later this month. The images show a far softer styling than Mazda's current crop of Kodo-inspired vehicles, while the overall look screams of a modern-day Cosmo Sport, the Japanese brand's first rotary-powered vehicle. And though that connection alone might be enough to justify whisperings of a successor to the RX-7 and RX-8, Motoring claims there will be an even more overt sign of this concept's power source. "Look to the Cosmo Sport," an inside source told the Aussie website, signaling that the Mazda stand would feature the vintage two-door. "The Cosmo has no earthly reason for being there unless..." The rotary rumor, if it comes true, won't exactly be what we're use to. While Motoring brings up the previously reported 16X – a 1.6-liter two-rotor – it builds on our 2013 report. According to the Aussies, the new engine could feature a two-stage electric turbocharger, be paired with a hybrid powertrain, offer up to 450 horsepower, and we're guessing, be hilariously complicated. Joking aside, it sounds like Mazda's goals here are admirable. A rotary-equipped sports car that could counter the 1.3-liter RX-8 engine's appetite for fuel and improve on its mediocre low and mid-range torque would be interesting indeed. As for those renderings, Motoring has front and rear three-quarter images. Comparing the rear with our original teaser leaves the look open to interpretation, but after seriously upping the exposure on the teaser (thanks Photoshop), the taillights and overall profile shape look to be a spot-on match. In front, the long hood shares some Kodo elements, like the headlights and grille, but its undeniable coupe shape – a long hood and very short deck – are far more organic and, dare we say, calm, than Mazda's other vehicles. You can take a closer look at the renderings over at Motoring's website. Do that, and then head back and let us know what you think of these RX-9 rumors. Is Mazda finally going to be bringing a rotary back to market?

2019 Mazda3 First Drive Review | Defining the term 'fun to drive'

Fun to drive. The phrase gets blasted from seemingly every car commercial, magazine ad, and influencer account – overused that it has lost all meaning. So when Mazda, a small firm that actually does make cars that are fun to drive, talks about their most compelling trait it gets lost in the cacophony of ad spends. However, we're here to tell you that yes, while it's difficult to quantify, some cars are objectively more fun to drive than others, and the all-new 2019 Mazda3 is — and this is a very technical term — a freakin' blast. At Mazda's behest, we took a 2019 sedan up Angeles Crest Highway just outside of L.A. With plenty of yellow signs, tight sequences of banked curves and elevation changes, it's the platonic ideal of those serpentine mountain roads you see in car commercials. The instant the Mazda3 reaches the windy roads, it glides in like an otter diving into the sea. Lively and graceful, it dances along a ribbon of asphalt more naturally than any compact sedan we've driven since the advent of drive-by-wire. The steering is not only direct and true, but possesses an extraordinary ability to maintain trajectory. From the moment you turn in, you never need to make adjustments to the steering wheel until the front tires are straight again. The car goes exactly where you intend, always. That's not hyperbole, but an amazing feat of engineering. In nearly every other vehicle, even those that purport to be sports cars, unless you're incredibly familiar with the machine and know the road like the back of your hand, minor mid-corner corrections are an inevitability. With the 3, you get it right on the first try. Now imagine you're on strip of canyon pavement with lots of short switchbacks in varying radii coming up fast, one right after another. The 3 links them all together with pure ease, and soon you're developing a rhythm through the curves. While other cars charge, the Mazda flows. The car's poise is particularly evident as momentum shifts from one direction to another, what Mazda chassis engineer Dave Coleman termed "transience." In most cars passengers are tossed around the cabin like mannequins, but the 3 cuts out the turbulence, its body engineered to move in a smooth undulation. At the midpoint of the transition, there's even a moment of weightlessness before the car tucks into the next turn and the seat seems to scoop you up and carry you onward.