2001 Mazda 626 Lx Sedan 4-door 2.0l 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.

Tesla Model Y and Cadillac CT5 | Autoblog Podcast #573

In this week's Autoblog Podcast, Editor-in-Chief Greg Migliore is joined by Consumer Editor Jeremy Korzeniewski and Associate Editor Joel Stocksdale. They catch up on the Tesla Model Y, as well as the Cadillac CT5 and the brand's new naming structure. Afterward they talk about our driving the 2019 Mazda3, 2019 Volkswagen Golf GTI and 2019 Ford Ranger. Finally, the three editors take a lap around eBay looking for the best ways to spend $15,000 on a car. Autoblog Podcast #573 Get The Podcast iTunes – Subscribe to the Autoblog Podcast in iTunes RSS – Add the Autoblog Podcast feed to your RSS aggregator MP3 – Download the MP3 directly Rundown Tesla Model Y unveiled Cadillac CT5 and Cadillac's new badging strategy Cars we're driving: 2019 Mazda3 2019 VW Golf GTI 2019 Ford Ranger How we'd spend $15,000 on eBay Feedback Email – Podcast@Autoblog.com Review the show on iTunes Related Video:

Teen Miata enthusiast and friend of Autoblog passes away

When Thomas' illness made it impossible for him to drive, he relied on friends to do it for him.
Attending the reveal of the 2016 MX-5 Miata and the subsequent 25th anniversary celebration at Mazda Raceway Laguna Seca confirmed that the little roadster maintains broad appeal, one not limited to the elderly or a certain gender as detractors might have you believe. In fact, the assembled crowd was surprisingly youthful, particularly amongst the club racer set and tuners. But one young Miata owner and superfan unfortunately wasn't in attendance - Thomas Jost, 19, was busy fighting for his life in a Maryland hospital.