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Mazda hard at work on Skyactiv 2 engine technology

As Mazda continues the current rollout of its still-new Skyactiv technology, the automaker is already looking at improving its family of engines for even better fuel economy and emissions reductions. Automotive News reports that with stricter fuel economy and emissions regulations planned for 2020 and 2025 in Europe, Mazda will likely release engines with next-generation Skyactiv 2 technology by the end of this decade, and Skyactiv 3 units just five years later.
The latter is expected to focus on improved engine cooling and lessening energy losses, but the big news in AN's report is that the next-gen Skyactiv 2 engines will use Homogeneous Charge Compression Ignition, or HCCI. This type of ignition is very similar to how a diesel engine operates (with high compression and using the compression stroke for fuel combustion rather than spark plugs), a method said to provide a cleaner and more efficient fuel burn - to the tune of a 30-percent improvement in fuel economy compared to current Skyactiv engines. Other automakers, including Hyundai, have already announced they are developing HCCI powerplants with similar technology and characteristics, so Mazda likely won't be a lone wolf here.
Equipped with HCCI technology, Mazda figures to be able to compete with larger automakers in terms of fuel economy and emissions without resorting to hybrid powertrains, continuously variable transmissions or automatics relying on more forward gears (eight or more) for optimal efficiency. Some of the challenges of HCCI, according to AN, include the need for better engine cooling, risk of misfire at high and low rpm and uneven engine performance based on fuel properties.

This is what a 1,200-hp twin-turbo 4-rotor looks like in a Miata

We've seen the diminutive Mazda MX-5 Miata swallow plenty of big engines, but New Zealand drifting ace "Mad Mike" Whiddett is roaring into where-no-man-has-gone-before territory. Wanting to replace his 515-horsepower "MADBUL" RX-7 and its twin-turbocharged, three-rotor 20B engine, his new ride is an NC-series Miata with four rotors and twin Garrett turbochargers courtesy of Pulse Performance Race Engineering. It is called "RADBUL," and expected power at standard boost is 1,200 hp, but the builders at Pulse Performance think it will get up to 1,500 hp at full boost. And yes, that exhaust exits through the hood. Four-rotor engines are actually popular - builds are detailed on forums like this one from 2007 and this one from 2008, this UK company or this Canadian company will sell you one complete - but they're usually being prepped for an RX-7. Mad Mike's choice of a Miata for this enterprise makes this about as extreme as you can get, short of throwing it into a Mazda R360. You can watch Mad Mike tell the story of the build in the video, and check out the first and second installments about the build on the Red Bull site.

Rumored Mazda CX-3 may not be for US

Mazda has used its Kodo design language to make some of the most attractive, affordable cars in the world right now, with the Mazda3, Mazda6 and CX-5 (pictured above), but it still lacks a crossover in the smaller class, which are becoming popular on the world market. It seems like a natural fit then, that the Japanese company would shrink its CUV design even smaller for a CX-3 to fill the gap. However, a rumor suggests that the compact might not make it to these shores.
The Mazda2-based crossover is due later this summer in Japan and is launching in Europe and emerging markets later, according to Automotive News citing a report in Japan's Nikkei newspaper. The little CUV would cost between 1.5 million yen and 2.0 million yen ($14,700-$19,500) in Japan and be available with diesel and petrol engine options. However, the report made no mention of selling it in North America. There is a glimmer of a chance for the CX-3 here. Mazda is upgrading its Mexican factory to 230,000 annual unit capacity by 2016, which gives it the room to add the new vehicle.
While the midsize CUVs are hugely popular in the US, compacts like the Buick Encore are still a small portion of things. If Mazda could time the CX-3's launch right here, it could take advantage of the lack of competition.