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Mazda files patents for a sequential twin-turbo setup

Mazda has a history of interesting engine technologies, from yesterday's rotary engine to tomorrow's compression ignition engine, and new patents show it still may have some internal combustion tricks up its sleeve. The one on display in these patents isn't especially new in concept, though. A sequential twin-turbocharger setup is something Mazda itself used on the third-generation RX-7. But it's something we haven't seen much of lately. It looks like it could have some possible advantages over older sequential systems, and it has some potential advantages for enthusiasts. First a quick and dirty primer for what makes a sequential twin-turbo system distinct from other twin-turbo systems. In many twin-turbo engines, there are simply two turbos that work together as one bigger turbo. They're the same size, and they spool up at the same time. With a sequential setup, at low rpm, a smaller turbocharger is spooled up first at low-rpm for quicker throttle response, and as the rpm and exhaust pressure increases, a valve opens up that allows a larger turbocharger to also spool up and provide high-rpm boost. That's basically how the Mazda design shown above functions. A big flap blocks off the larger turbocharger exhaust inlet, channeling all the exhaust to the smaller turbo. When more exhaust is available at high rpm, it looks like that flap opens up to spool up the big turbo, too. What's interesting here is that the way the turbochargers are packaged takes up less space than past systems. It looks like both turbos are contained in one unit that shares the same exhaust outlet, meaning the exhaust manifold could be kept simple and compact. In fact, the piping for compressed intake air could also be shared, reducing the amount of piping, which would further decrease the amount of materials and possible failure points. There are a number advantages of making this system smaller. The potential applications of the system are much greater, since it could fit in smaller cars with smaller engine bays. Making the system smaller also means that there won't be as much weight, which is important from both fuel economy and performance standpoints. Finally, the smaller setup likely uses fewer materials, which could make the system cheaper and thus easier to offer on a wider range of vehicles, or at least more profitable for Mazda.

Mazda will have a new rotary concept at Tokyo show, trying to bring it to production

Despite ending production of the rotary engine in 2012, Mazda has repeatedly insisted that it's still working on rotary engine tech, and it has continued to tease a potential future rotary car with concepts, the latest of which was the RX-Vision. The company even continues to file patents on rotary tech. It seems the company is continuing this pattern, since the vice president for Mazda's European R&D center told Auto Express that it has another rotary concept ready for this October's Tokyo Motor Show. According to Auto Express, the car expands on the groundwork laid by the RX-Vision concept. In addition to revealing the existence of the concept, the executive also reiterated the fact that there's still a team in Mazda working on the rotary engine, and people are still trying to make a business case for a new rotary sports car. Auto Express expects a production car could come in 2020. The news outlet also asked if the hypothetical car would be hybridized, and the Mazda executive didn't give much of an answer beyond it being possible, though he would prefer a purely rotary-powered car. We at Autoblog think a hybrid rotary of some sort would make the most sense. It would make for an impressive halo vehicle that could be used to promote future Mazda hybrids. This would also help with the business case side of things. An electric motor, or motors, would be highly complementary to the rotary engine as well. Electric motors produce oodles of torque from down low, which rotaries don't, and the rotary engine's high-rpm horsepower would compensate for the electric motors when they've started running out of power. Not only that, but using a hybrid powertrain could help a thirsty rotary engine meet fuel economy and emissions requirements while still producing plenty of power. A hybrid system is also more possible now that Mazda is teamed up with hybrid expert Toyota. Related Video:

Mazda6 diesel to race at Rolex 24, team and drivers announced

Mazda is getting serious about showing off the Skyactiv-D turbo-diesel four-cylinder engine in the Mazda6. The automaker has just announced it will campaign three diesel Mazda6 racers in the Grand-Am GX class of the upcoming 2013 Rolex 24 at Daytona in a quest to walk away with the company's 24th class win. Mazda partnered with SpeedSource to develop the race version of the new sedan, with Japanese and American engineers lending a helping hand where needed. Meanwhile, Freedom Autosport and Visit Florida Racing/SpeedSource/Yellow Dragon Racing will helm teams of their own.
Each car will make use of a five-driver team for the 24-hour race on January 26. In the interim, you can check out the full press release below for more information as well as the full driver roster. Mazda says we can expect to see the No. 70 SpeedSource car under the lights at the 2013 Detroit Auto Show later this month, as well.