1993 Mazda Rx-7 Touring Coupe 2-door 1.3l on 2040-cars

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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.

Mazda5 may not be long for this world

The concept behind building a smaller but still useful minivan like the Mazda5 always seemed like such a good idea. However, since the little people hauler's introduction, there has been the rise of the compact crossover in the US, which fulfills a similar niche for many buyers. The future is not looking good for the utilitarian Mazda. Autocar from the UK reports that company officials confirm the Mazda5 is being discontinued there, with no replacement planned. Autoblog reached out to Mazda North America, but the company would not verify future product changes in this region. Though, the model's cancellation would hardly be a surprise to follow in North America, as well. The minivan market is a tough place these days, and dealers tend to prefer more expensive models for their high margins. Even FCA US is abandoning the inexpensive portion of the segment for the next-gen Chrysler Town & Country. The Mazda5 isn't exactly a sales standout, either. Mazda sold 11,613 of them in all of 2014, which was a 16.4 percent drop from 13,884 in 2013. To compare to larger, more expensive minivans, Honda moved 122,738 units of the Odyssey last year, and Toyota did 124,502 examples of the Sienna. Related Video: Featured Gallery 2012 Mazda5 View 31 Photos News Source: AutocarImage Credit: Mazda Mazda Minivan/Van mazda5

Mazda 767B crashes during Goodwood, suffers heavy damage [UPDATE]

Update: Autoblog has learned that the Mazda 767B wrecked at Goodwood was being driven by Seniji Hoshino. He was not seriously harmed and was able to walk away from the crash. Hoshino's car was chassis 001 and scored a win in the GTP class of the 1989 24 Hours of Le Mans. A Mazda 767B Group C racer suffered a crash the Goodwood Festival of Speed that tore off the rear wing and did some fairly serious looking front end damage. According to Jalopnik, the racer was taking a timed run during the event's famous hillclimb when it went into the hay bales. The driver is reportedly okay, though. We've reached out to Mazda and Goodwood sources to identify the pilot in question, with no luck so far. Look for an updated post later in the day if we get any answers on that front. Images of the sad wreck seem to be populating on Twitter feeds as we write this. The racing Mazda clearly suffered a big hit today; painful to look at even after the fact. But we're not sure if the damage is beyond the abilities of skilled factory workmen to fix. Our collective fingers are crossed. Mazda has a major presence at Goodwood this year, including the event's art installation. Among all of its vehicles, there are two privately owned 767Bs. These racers have a four-rotor engine, said to be good for more than 600 horsepower in racing trim, and are predecessors to the famous 787B that scored an overall win in the 1991 24 Hours of Le Mans. This content is hosted by a third party. To view it, please update your privacy preferences. Manage Settings.