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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.

Mazda is going to start restoring first-generation Miatas

Many of the world's premium car companies have in-house restoration shops that help provide parts and complete restorations to owners of classic models from the marques. Ferrari has one, Lamborghini has one, Mercedes-Benz has one. Now Mazda will have one, and it will be focused on the Mazda Miata, also known as the MX-5 in Europe, and the Roadster in Japan. And although some might think the Miata is too new for restoration, remember that it was launched in 1989, so it's closing in on 30 years old. Japanese Nostalgic Car broke the news of the restoration service, which will start accepting applications for restoration service this year, with the first work being done at the start of 2018. Mazda explains on its site (Google Translate is recommended) that owners of first-generation Miatas were telling the company they really wanted to restore and maintain their little convertibles for as long as they could, which is what prompted the company to pursue the service. Before offering it to customers, the company did a trial restoration of an early Miata (Roadster in Japan). Once Mazda starts restorations, it said the services will be tailored to the individual cars. In addition to restoration services, Mazda announced it will also start selling reproduction parts for first-generation Miatas. On the list of parts are new tops, Nardi wood steering wheels and shift knobs, and even the original-style Bridgestone tires. The company also said that it will add more parts later depending on which ones are most in demand. Unfortunately, according to Japanese Nostalgic Car, the service will only be available to owners in Japan for the time being. The service will also only be for first-generation models. But perhaps if the program is successful, and there's demand for other regions and generations, Mazda might expand the service. Related Video: Featured Gallery Mazda Roadster restoration View 10 Photos News Source: Japanese Nostalgic Car, MazdaImage Credit: Mazda Mazda Maintenance Convertible Performance Classics

MotorWeek checks out two sides of the '90s Japanese car scene

MotorWeek's Retro Reviews let you feel nostalgic about a huge range of classic cars, and the latest two releases offer a look at two very different sides of the Japanese car market in the 1990s. The video above shows off tuned examples of the Mazda RX-7 and Nissan 300ZX. Check out the clip below to remember the 1997 Honda CR-V, if you want to reminisce about something a little more utilitarian. The RX-7 and 300ZX were among the era's best Japanese sports cars, and these examples' suspension and engine overhauls gave them an extra boost. Peter Farrel Supercars tunes the Mazda, and the vibrant yellow paint and body kit make it look ready for an episode of Initial D. The updated powertrain stands up to the mean styling and gets the RX-7 to 60 miles per hour in 4.5 seconds. The Stillen 300ZX GTZ sports a giant wing, and new turbos take the output to 465 hp. It sprints to 60 in 4.9 seconds. The CR-V sits on the opposite end of the automotive spectrum as the tuned RX-7 and 300ZX, but it's even more important in a historical sense. The Honda (along with the Toyota RAV4 and others) was among the progenitors of today's mega-popular compact crossovers. These early examples set the foundation for offering buyers a utilitarian vehicle in a comfortable package with good fuel economy at an affordable price. The CR-V had some quirky charm, too, like the removable picnic table hidden in the cargo floor. This content is hosted by a third party. To view it, please update your privacy preferences. Manage Settings.