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Mazda patents show rotary engine for range-extended EV

Two years ago, Mazda introduced a fascinating range-extended electric car called the Mazda2 RE Range-Extender. It took an electric Mazda2, and dropped in an itty-bitty 330cc rotary engine. It wasn't the rotary-powered sports car we had hoped for, but it seemed like a unique way to keep the quirky engine alive and kicking. But not long after the car's reveal, it seemed to disappear. Now the basic idea has resurfaced with a few modern updates in a couple of US patents. The first patent is pretty straightforward and describes a range-extended EV similar to the BMW i3. At the front is an electric motor driving the front wheels. At the back is an internal combustion engine that powers an electric generator. In the middle is a lithium-ion battery for storing and delivering electricity. It's the same set-up as that Mazda2. The second patent is for an engine start-and-stop system, but specifically for rotary engines. The system is designed to shut off a rotary engine when not needed, much as modern piston engines do. It also stops the rotor in a position that closes the intake port to ensure no fuel or exhaust emissions slip out through the intake tract. This is necessary since there are no valves in a rotary, and air and exhaust come through ports that are "opened" and "closed" by the rotor itself. The patent also describes the possibility of firing a spark plug after the fuel has been cut to eliminate any leftover fuel emissions. This system would theoretically improve a rotary engine's fuel economy and emissions significantly, which would be a boon as those are two of the rotary's major weaknesses. The rotary-engine patent also includes the same range-extended powertrain drawing as the first patent. It's there as a description of a possible application. And in such an application, where the rotary wouldn't have to run all the time, the system could take advantage of the rotary's inherent strengths. Weight can be kept low thanks to the engine's small dimensions, which should help in keeping the car sprightly and efficient. Rotaries are renowned for smoothness, too, so it shouldn't need too much refining and sound deadening, the latter of which adds more weight. The small size would also help with packaging, leaving more space for people, cargo, or possibly batteries. And since it has been patented, the company may be looking to bring the system to market.

Mazda marks its 100th anniversary with eight retro-styled limited-edition models

Mazda is turning 100 years old in 2020, and it's commemorating the occasion by releasing eight retro-inspired limited-edition models in its home country of Japan. Some of them might be available in the United States. Cars weren't initially on the company's radar. It started life as a cork manufacturer named Toyo Kogyo, and it branched out into the transportation sector when it introduced a three-wheeled, motorcycle-based pickup called Mazda-Go in 1931. Its first car, the R360, was unveiled in 1960 as a two-door four-seater whose tiny dimensions fell in line with Japan's strict kei regulations. It's the model Mazda's celebratory cars are inspired by. The range of special-edition models includes the CX-3, the CX-30, the CX-5, the CX-8, the Mazda2, the Mazda3, the Mazda6, plus hard- and soft-topped variants of the MX-5 Miata. They all feature an edition-specific white exterior and a burgundy interior, though the Miata and the CX-30 also get a red roof. The 100th Anniversary logo, which combines Mazda's current emblem with Toyo Kogyo's, appears on the wheels and on the front headrests, among other places. White and red was one of the combinations available on upmarket versions of the R360. None of the commemorative cars receive mechanical modifications, which is just as well. Paying homage to the humble R360 (shown in our gallery) would require replacing the Miata's 181-horsepower, 2.0-liter four-cylinder with an air-cooled, 356cc v-twin rated at 16 horsepower. It would need to be mounted in the trunk, too. The full 100th Anniversary range is on sale in Japan, and it will be available through March 2021. Mazda announced availability in other markets, like England, but it hasn't revealed if it will offer its commemorative cars in the United States yet due to "the global crisis." The 500 examples of the head-turning Miata 30th Anniversary introduced in 2019 were spoken for so quickly that the company allocated 143 additional units to our market, so we wouldn't be surprised to see the newest special-edition models land in showrooms in the near future. For context, the United Kingdom will receive 100 examples of the Miata, the CX-30, and the Mazda3. The Mazda6 and the CX-5 might join the roster later on. Pricing information will be published later in 2020. Related Video:    

Weekly Recap: GM plans massive new paint shop at Chevy Corvette factory

General Motors is laying out some serious green to maintain the Chevy Corvette's expansive color palette. The automaker is breaking ground on a new paint shop this summer that's part of a $439-million investment to upgrade the 34-year-old Bowling Green, KY, factory that builds the Stingray. The massive new structure will total 450,000 square feet, nearly half the size of the current 1-million square-foot facility. Construction is expected to take two years and won't impact Corvette production. The upgrades include new robots that save paint and create a better finish, longer, more efficient ovens to bake in the finish, and LED lighting. There's also a dry scrubbing booth technology with a limestone handling system that eliminates waste. GM has invested $135 million in the factory in last four years for the changeover to build the C7 and to relocate its Performance Build Center to Bowling Green. The improvements continue to modernize the Kentucky factory, which has become a tourist attraction in its own right, as more than 56,000 enthusiasts visited it last year. The upgrades are part of a $5.4-billion investment GM confirmed in April that will remake its US footprint in the next three years. The Bowling Green expansion underscores GM's continued commitment to the Corvette, which sold nearly 38,000 copies around the world last year, an eight-year high. "With this major technology investment, we can continue to exceed the expectations of sports car buyers for years to come," North American manufacturing manager Arvin Jones said in a statement. OTHER NEWS & NOTES Takata recall hits 34 million vehicles The National Highway Traffic Safety Administration expanded the Takata airbag recall to an almost unthinkable 34 million vehicles on Tuesday. The recall is part of an agreement reached by the two sides where Takata admitted some of its airbag inflators have a defect, and the deal compels the company to comply with all future regulatory actions and investigations. Takata's airbag inflators were produced with "a propellant that can degrade over time" and lead to ruptures, NHTSA said. Six deaths have been attributed to the flaw worldwide. Investigations conducted by Takata, automakers, and others have not determined the exact cause of the inflator problem, but NHTSA said moisture appears to alter the propellant's chemical structure. It then ignites too rapidly, creates too much pressure that ruptures the inflator, and blasts shards of metal at passengers.