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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.

2014 Mazda6 Skyactiv-D Wagon

This was sort of a quirky surprise drive opportunity. I've been over here in Italy for a while now, and Mazda Italia contacted me seemingly out of the blue to drive test some version of the Mazda6 with a diesel engine. Supremo. The Mazda6 is a sexy everyday beast and I have been digging their SkyActiv-D engines for a while now. Very spirited units.
My contact phones me the day of, and says he can come by with the car, and then we'll head off to some sort of special spot for dynamics testing and technical conversation. Nice deal, say I.
My guy Ernesto pulls up outside of the house and - lo and behold - it's a dang Mazda6 station wagon with the very most recent 2.2-liter SkyActiv-D motor good for 148 horsepower and healthy 280 pound-feet of torque. The wee four-banger with 14.0:1 compression ratio hauls this 3,260-pound wagon around with the best of them. A decent 0-to-60-mph time of 8.7 seconds, too.

Marchionne now considering 'Plan B' partners for FCA merger

Okay Sergio, just stop. With the sting of rejection from General Motors CEO Mary Barra still fresh, Fiat Chrysler Automobiles CEO Sergio Marchionne is moving on and trying to find another automaker to merge with. FCA may not be giving up hope on a merger with GM, but that doesn't mean it isn't at least considering alternatives. Sergio's so-called "Plan Bs" include the Volkswagen Group, as well as smaller Asian outfits, like Mazda, Honda, Suzuki, and Hyundai. Bloomberg reports that France's beleaguered PSA Peugeot Citroen could as a sort of "fallback" option due to its relative lack of volume, an unidentified source claimed. There are, of course, problems with each option. According to Bloomberg, Volkswagen expects complete control of a company, but the Agnelli family, which holds a large portion of FCA stock, is loathe to relinquish its stake in the company. On top of that, VAG just isn't looking to make a deal right now. Mazda, meanwhile, is enjoying a new partnership with Toyota and Suzuki is partially owned by VW. Honda and Hyundai have never expressed any interest in a partnership with a western automaker. That kind of just leaves the French then, but even that remains a long shot. As Bloomberg tells it, PSA boss Carlos Tavares is still working on a turn-around plan, and would want at least another six months to execute before even considering a deal with FCA. And even then, Tavares hasn't given any indication that he's considering a pairing. News Source: BloombergImage Credit: Paul Sancya / AP Chrysler Fiat GM Honda Hyundai Mazda Suzuki Citroen Peugeot Sergio Marchionne FCA Mary Barra psa peugeot citroen