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Mazda Skyactiv-X Review | The revolution begins with a squeeze-bang

The matte black Skyactiv-X prototype looks like a rough Mazda3, perhaps reconstructed after a bad wreck by an over-enthusiastic owner of a spot welder and lots of gaffers' tape. Ribbed ducts poke out of the dash sending two breaths of conditioned air to no one in particular. Even its revolutionary engine, the thing we're here to experience, is entombed in a massive, nondescript cover to mask its unseemly noises. It's a wild, strange way to meet a very unconventional vehicle that promises diesel-like fuel economy, a wide torque band, and an exotic method for burning less gas than ever before. It takes a few hours for Mazda's engineers to explain the fundamental principles of operation. For more detail, read our Skyactiv-X Spark Controlled Compression Ignition explainer, but here's a very brief overview. Skyactiv-X marries some traditional gasoline engine characteristics with a novel form of compression ignition called SPCCI. The key for Skyactiv-X is to use very high compression in the cylinder and an extremely lean fuel-air mixture. Squeezed right to the cusp of getting hot enough to blow up all on its own (which is very hard to predict), a squirt of extra gas and a spark interject to cross that compression-ignition threshold in a controlled and predictable manner. See the animation below: That takes a few essential components to get just right. One is a massive amount of computer processing power and some pressure sensors in the individual cylinders, because the ambient conditions change how and when these things happen. Skyactiv-X uses a clutched supercharger to pump in additional air when needed to nail the mixture precisely, and high-pressure injectors to get the low ratios of fuel to disperse properly in the chamber. And since it operates like a conventional gasoline engine sometimes, it uses valve timing to lower the very high compression ratio so it doesn't reach combustion ignition in that mode. In practice, the Skyactiv-X runs in compression ignition mode most of the time. In practical terms, that means it drives like a torquey gasoline Skyactiv engine. The torque curve is broad and flat — diesel-like in that respect. That also means it can get away with using a six-speed transmission and a lower final drive for better response. There's enough grunt and economy together that Mazda can let the engine spin faster — at 60 mph, it's running at roughly 1,000 more RPM than a similar gas engine, with greater efficiency.

Driving the Chevy Corvette Z06 and Porsche 911 Carrera T | Autoblog Podcast #551

On this week's Autoblog Podcast, Editor-in-Chief Greg Migliore is joined by Green Editor John Snyder and Associate Editor Joel Stocksdale. We talk about the wide variety of the cars we've been driving, starting with the Chevrolet Corvette Z06 and Porsche 911 Carrera T. Then we discuss the more powerful 2019 Mazda MX-5 Miata, our long-term Honda Ridgeline and our week with the Hyundai Ioniq PHEV. Finally with Pebble Beach on our minds, we preview the Concours d'Elegance.Autoblog Podcast #551 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 2019 Chevrolet Corvette Z06 2018 Porsche 911 Carrera T 2019 Mazda Miata 2018 Honda Ridgeline 2018 Hyundai Ionic Plug-In Hybrid Feedback Email – Podcast@Autoblog.com Review the show on iTunes Related Video:

Goodwood Festival of Speed celebrating Mazda this year [w/video]

Mazda gets to wear the crown and sash as the doubly honored marque for the Goodwood Festival of Speed this year. The Japanese brand will be the focus of the Central Feature, the sculpture that sits outside Goodwood House, and its race cars will be the focus on the lawn, where there will be at least one representative from "every era of Mazda's motor sport achievement." The theme for this year's event is "Flat-out and fearless: racing on the edge." The showcase, of course, will be the 700-horsepower, rotary-engined 787B that won the 24 Hours of Le Mans in 1991. It will run up the 1.6-mile Hillclimb while a Mazda challenger from the World Rally Championship runs the Forest Rally Stage, joining Andros Trophy ice racing and sportscar racing Mazdas. The festival happens from June 25-28 this year, and there's a press release with more details down below the video recap from 2014 and Mazda 787B Le Mans lap. This content is hosted by a third party. To view it, please update your privacy preferences. Manage Settings. This content is hosted by a third party. To view it, please update your privacy preferences. Manage Settings. Le Mans-winning 787B to headline fantastic Mazda line-up at FoS 2015 Feb 18, 2015 -- Mazda is the only Japanese manufacturer to have won the world's most prestigious motor race – the Le Mans 24 Hours – and the victorious rotary-engined 787B, with its distinctive sound, is certain to be a crowd favourite as it winds its way up Goodwood's iconic 1.16-mile Hillclimb at the Festival of Speed this year. The 787B is part of a fabulous collection of racing and road machines that will be brought to the Festival by Mazda, in the year in which the company is also being honoured by the iconic Central Feature outside Goodwood House. Further motor sport success has been achieved in touring cars, the World Rally Championship, Andros Trophy ice racing and sportscar competition in the USA – in which Mazda's pioneering SKYACTIV-D turbodiesel technology is breaking new ground currently. In fact, every era of Mazda's motor sport achievement will be marked by some incredible competition cars both on the Hillclimb and the Forest Rally Stage as we celebrate the FoS theme 'Flat-out and fearless; racing on the edge'. The Moving Motor Show on June 25, will also showcase many of the key models from Mazda's current range.