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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 RX-3 restomod makes Leno scream, us cheer

The Mazda RX-3 Savanna was the rotary-engined version of the Mazda 808 Grand Familia. Sold in the US from 1971 to 1978, the little Japanese fastback earned a reputation as an excellent racecar, winning events all over the world. A racing connection is how a fantastic 1973 restomod example owned by Savant Young made its way to Jay Leno's Garage. Young said that when he was a boy his uncle used to street race an RX-3, and Young liked how the RX-3 sounded and the fact that a tiny import could go up against and beat big V8s of the time. Leno admitted that he has no connection to the RX-3, saying it's not the kind of car he typically likes. But he liked Young's custom update so much that when he saw the coupe sitting outside the Petersen Museum in Los Angeles, he waited for the owner to show up. Young's changes over the 15 years he's owned the car include dropping in the rotary engine and running gear from the second-generation Mazda RX-7, bridge-ported and methane injected. At 15 pounds of boost he says it's putting out about 400 horsepower. The rear end comes from a Toyota Hilux half-ton pickup, to help put all that power down in a car that weighs maybe 2,100 pounds. The color is taken from the Lamborghini palette. Disc brakes all around, 14-inchers up front, control the velocity. Nothing controls the gas mileage, said to be "maybe 12 mpg." And nothing could stop Leno from whooping it up during the driver. Check out the fun in the video above.

2019 Mazda3 Review and Buying Guide | Redesigned and exceptional

The Mazda3 has long been a darling of car enthusiasts for its sharp styling and sharper driving dynamics. So when it was redesigned for 2019, there was some collective anxiety as to whether Mazda could continue the magic. From our experience, Mazda certainly has, and has improved its compact sedan and hatchback in many areas such as design and refinement. As a result, the 2019 Mazda3 is easily the most fun car in its segment to drive, barring specifically performance-oriented compact models, and now has materials and looks to rival entry-level luxury cars. Its only real faults are a slightly tight interior and a character that might put off fans of cushy cruisers. What's new for 2019? Pretty much everything. The Mazda3 has been completely redesigned for the 2019 model year. It's down to one engine for now — a lightly updated 2.5-liter naturally aspirated four-cylinder with or without cylinder deactivation — but a high-efficiency spark-controlled compression-ignition engine is coming later. And for the first time, the Mazda3 has available all-wheel drive on both sedan and hatchback body styles, making it one of only two cars in the segment with such a feature. 2019 Mazda3 AWD View 24 Photos What's the Mazda3's interior and in-car technology like? While the interior of the previous Mazda3 was one of the finest in the segment, the new model is vastly superior. In fact, it feels about on par with actual luxury cars in the top Premium trim. The dashboard has a sleek, modern look with subtle air vents, surfaces wrapped in a soft leather-like material, and an elegant steering wheel has nicely integrated buttons. All of the switchgear has a solid, crisp feel. The driving position is excellent, allowing the driver to sit either low or high and keeping all the controls and displays perfectly centered. Mazda also redesigned its infotainment system for this car. A major change is that there is no touchscreen functionality whatsoever, which is also partly why Mazda has moved the infotainment screen farther up the dash and more into the driver's line of sight. The entire menu layout has been revamped as well with options listed vertically instead of horizontally. The system runs substantially faster and smoother than the previous version, though it's not as easy to use due to additional layers of menus. It still isn't as complex as systems found in German cars, though. Mazda has also finally made Apple CarPlay and Android Auto standard features. How big is the Mazda3?