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How Mazda got Skyactiv-X to work is incredible

"Take everything you know about engines and turn it around," Mazda North America Vehicle Development Engineer Dave Coleman says, patiently and with a look of benevolent pity, as he's quizzed about the particulars of the company's new engine. The Skyactiv-X engine is enigmatic — and deceptively simple in operation. And the bottom line for American consumers is that they'll be able to buy a car (or crossover; we don't know yet what vehicle will first get it) by late 2019 that provides diesel-like fuel economy but runs on regular old gasoline. In between diesel and spark ignition, but it's neither To truly understand it, you have to dive into the contradictions. Take that regular old gasoline: Contrary to common sense, the lower the octane, the better it works. In the lab, the Skyactiv-X engine loves 80 octane. The lowest Americans get is 87, so the engine is tuned for that octane. Go higher and you lose some low-end torque. Coleman was right. It's hard to wrap your head around an engine that thrives just at the point when most gas engines would aggressively self-destruct. It uses a supercharger to pump additional air — but not additional fuel. It uses spark plugs to start a combustion cycle that normally doesn't need a spark. And, quixotically, it's not displacing Mazda's own American-market diesel engine, currently languishing in a seemingly endless hell of regulatory approval. More bizarre: Mazda is a tiny automaker facing real existential headwinds, and gasoline compression ignition is a massive challenge. GM and Hyundai announced compression ignition, or HCCI, projects (full name, homogeneous charge compression ignition) to great fanfare, but they never amounted to a production hill of beans, crippled by reliability issues or horrible vibrations. Worse, they only worked at an unusably narrow range — low RPMs and low loads. HCCI research improved direct-injection gas and diesel engine technologies for these companies, but HCCI itself remains untamed. The benefits of lean combustion Why even try to tame HCCI? The answer is much better fuel economy and lower emissions. Less burned carbon-based fuel, less carbon dioxide released. That's simple. But there are some thermodynamic reasons for the lean combustion you can achieve with compression ignition that are worth explaining. The ideal amount of fuel for a conventional engine to burn is about a 14:1 air-to-fuel ratio. That lets every molecule burn nicely, in theory.

2014 Mazda6: June 2013

The 2014 Mazda6 is our most recent addition to the Autoblog long-term fleet, and we spent the month of June getting to know our Soul Red tester, generally enjoying the honeymoon phase of this twelve-month relationship. During June, the Mazda6 spent the majority of its time with director of photography Drew Phillips, who in addition to putting together this pretty gallery of our rakish long-term car, had a lot to say about it as a daily driver.
You see, not too long before Mazda delivered our long-term 6, Drew bought a 2014 CX-5 crossover to support his growing family. The CX-5 was the first vehicle to use Mazda's full suite of Skyactiv technologies, and we've generally enjoyed the good-to-drive CUV. A lot of that CX-5 goodness lies beneath the more shapely lines of this sleek Mazda6 sedan, so it's only fitting that Drew had a lot of comparisons between Mazda's two housemates during his month behind the wheel.

New Mazda CX-4 teaser shots emerge ahead of Beijing debut

The Kodo styling language seen on last year's Koeru concept seems to translate well to a production car, judging by these teaser images of the upcoming CX-4 from Mazda's Chinese press site. And, as has been seen on several recent Mazdas, concept cars can be quite close to their eventual production versions. An earlier press release implies the CX-4 should be seen as a more coupe-like counterpart to the CX-5, with some of the MX-5's characteristic and often emphasized jinba ittai feel injected into it – if the MX-5 is all about the rider and horse being one, the CX-4 would just be a slightly bigger steed. The 19-inch wheels and LED headlights are some of the more attention-grabbing details on the car. Inside, there's a head-up-display and a MZD connect infotainment screen as seen on other current models. The hardware on the "Exploring-Coupe SUV", as Mazda call it, should match the CX-5: 2.2-liter SKYACTIV-D turbodiesels in some markets, 2.0 and 2.5-liter SKYACTIV-G gasoline engines in most. There will also be a choice of front-wheel-drive or all-wheel-drive. The Beijing Motor Show opens to the public on April 29th, so we won't have to wait a whole lot longer to see the whole thing. Related Video: