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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.

Monterey Car Week recap, 2025 Lincoln Navigator and more | Autoblog Podcast #845

In this episode of the Autoblog Podcast, Editor-in-Chief Greg Migliore is joined by Senior Editor Jeremy Korzeniewski. They look back on Monterey Car Week, and pick their favorite highlights from the event, including the new Lincoln Navigator, the Ruf Rodeo, Cadillac Opulent Velocity concept and more. In the news, Ford has abandoned its three-row EV in a pivot to hybrid. Our hosts review recent cars in the fleet, like the Mercedes GLC Coupe, long-term Mazda CX-90 and the three-wheel Can-Am Ryker. They also compare the Jeep Gladiator with the Wrangler. Send us your questions for the Mailbag and Spend My Money at: Podcast@Autoblog.com. Autoblog Podcast #845 Get The Podcast Apple Podcasts – Subscribe to the Autoblog Podcast in iTunes Spotify – Subscribe to the Autoblog Podcast on Spotify RSS – Add the Autoblog Podcast feed to your RSS aggregator MP3 – Download the MP3 directly Rundown Monterey Car Week recap 2025 Lincoln Navigator Ruf Rodeo Cadillac Opulent Velocity concept Lamborghini Temerario Porsche 911 Turbo 50 Years Ford-Ghia Probe I prototype burns to a crisp Ford cancels electric three-row SUV, pivots to hybrid Cars we're driving 2024 Mercedes-Benz GLC 300 Coupe 2024 Mazda CX-90 PHEV long-term update 2025 Can-Am Ryker 2024 Jeep Gladiator vs. Wrangler Feedback Email – Podcast@Autoblog.com Review the show on Apple Podcasts Autoblog is now live on your smart speakers and voice assistants with the audio Autoblog Daily Digest. Say “Hey Google, play the news from Autoblog” or "Alexa, open Autoblog" to get your favorite car website in audio form every day. A narrator will take you through the biggest stories or break down one of our comprehensive test drives. Related Video:  Corvette ZR1, Honda Civic Type R and Mercedes-AMG SL 63 | Autoblog Podcast 843 This content is hosted by a third party. To view it, please update your privacy preferences. Manage Settings.

A '70s F1 car and a first-gen Miata make an amazing lovechild

For no apparent reason, this artist asked what if Mazda built an MX-5-based F1 car? And what if it were from the 1970s, the glory days of James Hunt and Niki Lauda? Here's what it'd look like. Look at it! Look at its adorable little eyes and the huge tires. And the intake! The rendering is by YasidDesign and was done live in front of Facebook followers in a Facebook Live session. It borrows heavily from 1970s F1 cars – it looks like a March 741 served as the basis for the open-wheel portion – and blends it effortlessly with MX-5 styling cues. It all came together in about 90 minutes. Watching the process is remarkable, especially considering YasidDesign is doing the bulk of the work live while taking comments and advice from people on Facebook. Check out the video and YasidDesign's other works on his Facebook page. Related Video: