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Petrolicious lets a 1971 Mazda RX-2 howl

Rotary engines scream to the heavens in the best way possible. To hear a wonderful example of the Wankel's battle cry, turn up your speakers and watch Petrolicious highlight an immaculately clean 1971 Mazda RX-2 in Australia. Owner Jason Humble took three years to build his RX-2 from a bare shell, and he started competing with it in vintage racing in 2005. The little coupe's class pits it on track against Mustangs and Camaros, but Humble claims that he's regularly near the top of the pack thanks to the Mazda's communicative chassis. We don't get to see the RX-2 mixing things up on track in the Petrolicious video, but Humble does treat us to a drive through the Australian countryside. He's happy to let the coupe's rotary rev, and the little engine is capable of making a wonderful noise. It's great to see Petrolicious continue to give the spotlight to these sometimes overlooked classic Japanese sports cars.

Japanese students turning Mazda CX-5 into Dakar Rally-ready off-roader

Students at Japan's Nihon Automobile College (NATS) are transforming a first-generation Mazda CX-5 into a full-blown off-roader that looks ready to compete in the Dakar Rally. Named CX-Runner, the one-of-a-kind model will make its debut at the Tokyo Auto Salon opening its doors in January 2020. The Tokyo Auto Salon is the Japanese equivalent of the annual SEMA show, so anything goes under the bright lights. NATS students began the CX-Runner project with a used 2012 CX-5 and seemingly set out to leave as few original parts as possible. While the project isn't finished yet, a sketch released by the school suggests the crossover will receive wheel arch extensions, an external roll cage, a beefier suspension, and a shorter front bumper that increases the approach angle.  Photos published on the school's official Facebook page show the project is moving along nicely. The body extensions are made with a composite material that looks like Kevlar, and fitting the rear wheel arches required sealing the back doors, which is fine; the CX-Runner will be a two-seater. We don't know if students are planning to make changes to the CX-5's powertrain yet, but a thick skid plate will protect whatever is under the hood from expensive impacts with obstacles encountered off-road. nats-mazda-cx-runner-project-1 View 3 Photos The Tokyo Auto Salon will open its doors on January 10, so the students have time to finish the custom-made body kit, install the suspension, paint the CX-Runner, and fit the roll cage. They're not just doing this for fun, though. NATS began offering a customizing class in 1998, and building a tuner car is one of the requirements aspiring builders need to fulfill in order to graduate. With that in mind, it's no surprise that NATS will again have a big presence during the 2020 edition of the Tokyo Auto Salon. In addition to the CX-5 off-roader, its students are building six custom cars including a Nissan 370Z roadster wearing front and rear fascias sourced from a GT-R, a Toyota 2000GT-inspired convertible based on the Suzuki Cappuccino kei car from the 1990s, and a four-door, five-seater Toyota 86 built on Camry bones but powered by the coupe's flat-four engine. Relate Video:

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.