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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.

Ruminations in winter | 2016 Mazda MX-5 Miata long-term update

Winter is an odd time for our 2016 Mazda MX-5 Miata Club long-term tester. In the summer, the track beckons. Fall and spring bring top-down adventures at sunset. But our Miata is a little out of its enthusiast element when the weather is harsh and our moods grow as gray as a January day in Michigan. Sure, there's the occasional snowstorm, and equipped with winter tires the Miata can be a fun toy. But what about when it's just cold and dreary? We had a lot of time to reflect on our MX-5 these past few months, and we still managed to find enjoyment in the little things - even though admittedly this is not the time of year when the Miata shines. For starters, we taught associate video producer Amr Sayour how to drive a stick shift with the Miata. With its agreeable clutch and short throws, the six-speed manual was the perfect learning instrument for Sayour. His teacher, Adam Morath, actually had to show him how to stall. Arguably, learning to drive a manual isn't a little thing, but it was these run-of-the-mill events that showcased the Miata could be more than tolerable in winter. Associate Editor Joel Stocksdale used it for a 500-mile roundtrip to pick up a new pet and found it was a little tight for dog and driver. Though Stocksdale still enjoyed the sports-car feel, he came to the conclusion that "Miata is always the answer, but not always the best one." We also quickly realized the MX-5 isn't a great commuter car, nor did we expect it to be. It's low to the ground. It's loud. The small cabin has a greenhouse effect, and the windows fog easily. "If you have a Miata, it will creak and rattle in the winter. A lot. Nothing out of the ordinary here - this is a convertible with a lot of flexy parts - but something the casual shopper might not be aware of," Editor-in-Chief Mike Austin noted. Still, he found ways to have fun. "On the upside, winter tires = low-speed power oversteer." We had a lot of time to reflect on our MX-5 these past few months, and we still managed to find enjoyment in the little things. Speaking of those snowshoes, Stocksdale said they made our Mazda a "perfectly acceptable winter ride." Keeping the traction control on, he navigated his neighborhood roads in packed snow with little trouble. Like Austin advised, be aware of the ground clearance; Stocksdale got hung up in deep snow while attempting to scale his driveway.

Updated Mazda6 Wagon to look lovely in Geneva

For the 2018 model year, Mazda updated the Mazda6 sedan with some design and mechanical tweaks. It will take the stand for its European debut at the 2018 Geneva Motor Show. There, it will be staged alongside the Mazda6 Wagon, which will be getting its own global debut at the Swiss expo. Unless there's some sort of miracle, we won't be getting the five-door version here in the United States, which is a shame, because it's a beautiful wagon. Customers here — apart from a handful of die-hard fans and, perhaps, the entirety of the American automotive press — prefer something with a bit more elevation to it. Ask a Mazda dealer in Michigan or Arizona for a Mazda6 Wagon, and they'll probably try to sell you a CX-5 instead. That frustrates the wagon fans. "It's gorgeous," said Autoblog Associate Editor Joel Stocksdale. "It kills me that we don't get it." The Mazda6 Wagon, like the new sedan, features an updated exterior and interior design, new seating, better performance, and improved driving dynamics. The Mazda6 Wagon will be on the show floor with a number of other beautiful cars, including the Mazda Kai and Vision Coupe concepts, which bowed at the Tokyo show. Mazda will also showcase its new gasoline-powered Skyactiv-X spark controlled compression ignition, which we were recently able to test in a prototype vehicle. Related Video: This content is hosted by a third party. To view it, please update your privacy preferences. Manage Settings. Design/Style Geneva Motor Show Mazda Wagon 2018 Geneva Motor Show mazda6 wagon