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Patent application suggests Mazda rotary return

A recent patent application by Mazda reveals that the Japanese automaker is still working on the rotary engine. This could in fact be the Skyactiv-R engine found in the RX-Vision concept from the 2015 Tokyo Motor Show. As with anything Wankel-related, nothing is certain until Mazda makes a production commitment. But this filing suggests that serious development is happening in Hiroshima. The 2011 Mazda RX-8 was the last rotary-powered car you could buy in America. Slow sales, poor fuel economy, and tighter emissions standards prevented Mazda from committing to a follow-up. But the fundamental principles of the rotary - compact size and light weight - perfectly fit Mazda's Skyactiv ethos. (For an explanation of how rotaries work, click here.) In this new engine the intake port sits at the bottom of the engine with the exhaust port on top instead of the other way around. That allows for lower mounting, which improves a car's center of gravity. This rotary is also turbocharged. Putting the turbo up high helps ensure it doesn't get in the way of any body or chassis crossmembers. The implication of those claims is that somebody is thinking about how to put this engine in a car. There are other benefits as well. The short path from the exhaust port to the turbo ensures minimal turbo lag. It also allows for a close-mounted catalyst on top of the enigne, which will help emissions. Another innovation in this new engine is a triangle-shaped rotor that covers part of the exhaust port. This allows for different exhaust flow characteristics. The filing claims that that two of the four orientations allow for less airflow resistance in the exhaust port. As in previous Mazda rotaries, there are two spark plugs to manage ignition timing and combustion. But unlike in the 16X concept, Mazda's last public display of such an engine, the new rotary uses port fuel injection. Keep in mind this is only a patent application. A Mazda spokesperson refused to comment on future product, but commented "As we stated at the Tokyo motor show, Mazda is doing all that it can to bring a rotary to the market." In the meantime, keep your RX-7 prayer candles lit and hope for the return of the rotary before the end of the decade. You can bide your time by reading the entire application here. Related Video: Related Gallery Mazda RX-Vision Concept: Tokyo 2015 View 11 Photos News Source: USPTO via autoevolution Rumormill Mazda Performance rotary mazda rx7

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.

Perk up your Mazda Miata with BBR's new 248-horsepower turbo kit

For three decades, enthusiasts have argued whether the Mazda MX-5 Miata needs more power. For its part, Mazda seems fine with leaving the Miata as is, even reducing the horsepower from the third- to fourth-generation models, though the car lost a little weight. That's where tuners like BBR in the UK and Flyin' Miata here in the US step in, offering aftermarket solutions for those that crave a little more grunt. BBR announced today that its new 248-horsepower Stage 1 turbo kit is ready and waiting for the new 2.0-liter-powered ND Miatas, including the new Miata RF. BBR's first Miata turbo kit was released all the way back in 1990. Since then, the shop has been tuning and honing its craft, releasing ever-more potent variations its comprehensive power kit. This new version, like the previous ones, focuses not only on adding more power but maintaining the level of drivability and refinement you expect from all Miatas. The Mazda electronic safety features are retained, and the team is working on CARB emissions approval. That said, with BBR tune an ND Miata will hit 60 mph in just 5.0 seconds, roughly two seconds quicker than stock. To get the peak 248 horsepower and 236 lb-ft of torque, BBR does more than simply slap on a big turbo. In 2014, BBR began using a Mazda3 as a development vehicle in preparation for the new Miata's launch. A twin-scroll turbocharger is mounted onto a custom cast-iron manifold. A front-mounted aluminum intercooler keep things cool and doesn't require cutting up the bodywork. The engine breathes in through a K&N air filter and exhales through a stainless steel downpipe. The whole thing is controlled by BBR's Starchip / EcuTek RaceRom ECU software package. Other upgrades include silicone turbo pipes, an aluminum battery tray, a recirculating piston type dump valve, a carbon-fiber heat shield, and stainless steel oil and water lines. BBR is offering extended warranties from 12 to 36 months. In the US, the sole distributor is Flyin' Miata in Colorado. At $5,695, it's not a cheap proposition, but it is less expensive than one of Flyin' Miata's V8 swap kits. Less expensive (and less potent) performance kits are also available. Related Video: News Source: BBR Aftermarket Mazda Convertible Performance turbo tuner tuning