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Mazda's next-gen SkyActiv engines will drop spark plugs in favor of high compression

Homogeneous charge compression ignition, or HCCI, is the black art of internal combustion engines that aims to produce diesel-like fuel efficiency for the cost of gasoline. Although some of its competitors have developed and subsequently given up on the tech, Mazda confirmed that the next-generation of SkyActiv engines will employ HCCI technology, improving fuel economy by 30 percent and at the same time reducing exhaust emissions. According to Nikkei, a new SkyActiv family of engines is set to debut under the hood of the next-gen Mazda3 sometime in 2018 before making its way into other vehicles. In simple terms, an engine that uses HCCI burns the air/fuel mix using pressure instead of with spark plugs, just like a diesel. At 14:1, Mazda's gasoline engines already have some of the highest compression ratios out there, but a move to HCCI means cranking up the compression to 18:1. While the tech sounds relatively straightforward, using HCCI means dealing with a number of side issues. It's one of those "on paper" ideas that compounds problems when put into practice. Heat, revs, and fuel must all be carefully managed as gasoline doesn't burn the same way as diesel. Mazda is mum on details, but the automaker seems confident that the issues have been sorted. If the new engines do indeed make it to market with HCCI, Mazda will have out-engineered GM, Daimler, and Hyundai, all of which have tried and failed to develop HCCI engines in a cost-effective package. With the market moving towards electrification, it's interesting to see Mazda still focusing so heavily on traditional internal combustion gasoline engines. It's an indication of where they see the market heading for the next few years. Although the automaker has been hesitant to move forward with hybrid and electric powertrains, Nikkei also reports that Mazda will begin mass production of EVs in 2019. Related Video:

Mazda will introduce a groundbreaking new diesel engine in 2020

Mazda is preparing to introduce its first series-produced electric car, but it's not sending the diesel engine to the automotive graveyard. The company remains committed to turbodiesel technology, and it will take its efficiency to the next level when it introduces a new range of engines in 2020. "We are sticking to diesel engines. In 2020, we have a new approach to diesel engines. We will show you how clean and very efficient diesel engines can be," pledged Christian Schultze, the head of research and development for Mazda's European division, in an interview with British magazine Autocar. He declined to provide specific details about the breakthrough that made a cleaner, more efficient diesel engine possible. Asked about how the engine compared to SkyActiv-X, the carmaker's newest and most innovative gasoline-powered engine, he pointed out "there are not so many differences between [gasoline] and diesel." His announcement falls in line with Mazda's belief that it's crucially important to consider real-world emissions over the life cycle of a car, not just local emissions. The company has realistically stated the internal combustion engine -- whether it burns gasoline or diesel -- will "continue to be the base power for 85 percent of all cars up until 2035." It might join forces with a 48-volt electrical system, or it might be part of a plug-in hybrid drivetrain, but it will still be around in 15 years. To that end, it's important to keep improving the technology, and not to prematurely pen its obituary.  "We hope governments wake up and see that electrification is one way but there are others, too," Schultze concluded, adding that SkyActiv-X is a step in the right direction. Mazda will release more details about its next turbodiesel engine in the coming months, but it's too early to tell whether it will available in the United States, where demand for oil-burning cars has hit rock bottom. As of 2019, the only diesel-powered Mazda sold in America is an upmarket variant of the CX-5 (pictured). Auto News Mazda Diesel Vehicles

Mazda still has a team working on rotary engines

The flame still burns within Mazda to stage a rotary engine revival. Before you start getting excited, it's way too soon to start saving money for the fabled, next-gen RX-7 or RX-8. Still, company boss Masamichi Kogai confirmed to Autocar that the Japanese automaker has an engineering team dedicated to improving the Wankel. This development group has the hard task of trying to make the rotary stack up to modern internal combustion engines in terms of emissions and fuel-economy standards. Neither factor were ever exactly Wankel's strong suits. Kogai described them as working "very enthusiastically" to Autocar. The boss didn't discuss any future RX-vehicles or the size of the team, however, a report from last year indicated that there were 30 engineers in partnership with universities to update the engine's design. After problems keeping up with emissions and fuel economy, Mazda built it's last rotary for an RX-8 in June 2012. Since then, there have been intermittent rumors of a return. One possible solution was a design called the 16X that was supposed to offer more torque and better fuel economy. Another possibility was a small-displacement unit as a range-extender in an electric Mazda2. Rumors of a new RX-7 have been heard for years. In 2013, Kogai clearly said that it wasn't happening. When asked again last year, he reiterated the same point.