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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:

Mazda2 successor to ride atop shortened CX-5 platform

Mazda, looking to make the most of its new, lightweight Skyactiv vehicle architecture, will allegedly use a version of the CX-5 crossover's platform to underpin its next-generation Mazda2 hatchback, according to a report from Just-Auto.com. Of course, the Mazda2 is a much smaller vehicle than its larger CUV stablemate, so some serious chopping will no doubt be in order when it comes time to engineer the replacement for the company's smallest hatch.
Currently, the CX-5 and the sleek new Mazda6 share many of the same platform components, and this architecture will already be scaled down to support the next-generation Mazda3 sedan and hatchback, which will debut later this year. Just-Auto.com states that all of Mazda's remaining front-wheel-drive vehicles will eventually switch to reworked versions of this Skyactiv platform, including the replacement for the larger CX-9 crossover.
Also of note, Mazda will reportedly be switching to shorter, four-year lifecycles for its vehicles. This means that the newly launched Mazda6 will be replaced for the 2016 calendar year, with a refresh coming sometime in 2014. That said, vehicles with platforms supplied by other automakers (like the upcoming MX-5 Miata replacement that will share its underpinnings with an Alfa Romeo product) will not necessarily follow this four-year rule.

Mazda6 Skyactiv-D Racecar ready to bring diesel to Grand-Am

It may not be quite as radical as some of the company's past rotary racers, but the new Mazda6 Skyactiv-D racecar does have a notable powertrain underhood: the automaker's brand-new clean diesel four-cylinder engine.
Three of these new diesel-powered Mazda6 racers will take to the track in the Grand-Am GX class of the upcoming 2013 Rolex 24 at Daytona on January 26, with five drivers on each team. The car you see above, number 70, is sponsored by Mazda's longtime motorsports partner, SpeedSource.
Check out our full gallery of high-res images live from the 2013 Detroit Auto Show above and feel free to read through the related press release from Mazda below.