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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.

2018 Mazda Miata adds a cherry on top

For 2018, Mazda is adding a number of new options that should get the attention of prospective Miata buyers, and one of them is shown above. Starting with the new model year, Mazda will offer both the usual black soft top, but also a "Dark Cherry" red top. It looks quite sharp with the silvery-blue color above, and it should be an excellent complement to the Grand Touring model's newest interior option. On the Grand Touring trim, customers can choose the reddish-brown Nappa leather interior that was first applied to the Miata RF Launch Edition. The interior package adds $300 to the top-trim Miata's price tag. There are a few other upgrades sprinkled throughout the Miata lineup. The base-level Sport models will finally get infotainment with a 7-inch screen instead of the little stereo controls mounted to the dash. The midrange Club model now gets heated cloth seats that are upgraded to heated leather units with the Brembo/BBS package, which for $3,770 adds Brembo brakes, BBS wheels, a body kit and the aforementioned seats. Another $700 nets the same package but with Recaro seats that also feature seat heaters. Along with the new features come slight price increases across the board. The base 2018 Sport trim now starts at $26,185, an increase of $395. The Club increases in price by $370 to $30,045, and the Grand Touring has the smallest change of $145 to $31,085. The first 2018 soft-top Miatas will arrive at dealerships this month, and should be available everywhere in January. Related Video: Image Credit: Mazda Mazda Convertible Performance mazda mx5

2022 VW GTI, Golf R and Ford's electric future | Autoblog Podcast #680

In this episode of the Autoblog Podcast, Editor-in-Chief Greg Migliore is joined by Road Test Editor Zac Palmer. They start off discussing their drives in the 2022 VW GTI and 2022 VW Golf R. They then discuss the news, which is jam-packed this week. The Mazda6 and CX-3 are going away, and Alfa is reportedly mulling a new GTV and Duetto. Plus, Ford teased an electric Bronco, confirmed a future electric Explorer and fully revealed the work truck version of the 2022 F-150 Lightning named the "Pro." They end by turning to the mailbag and responding to another listener's Spend My Money question. Autoblog Podcast #680 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 Cars we're driving 2022 Volkswagen GTI 2022 Volkswagen Golf R News Mazda6 and Mazda CX-3 officially discontinued for 2022 Alfa Romeo's new CEO sees room to bring back the GTV and the Duetto Electric Ford Bronco could be coming, electric Explorer is confirmed F-150 Lightning Pro revealed as Ford's sub-$40K electric work truck Opinion We need to legalize adaptive driving beams already, for safety's sake Mailbag Spend My Money Feedback Email – Podcast@Autoblog.com Review the show on iTunes 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: Podcasts Alfa Romeo Ford Mazda Porsche Volkswagen Hatchback Performance