Mazda Developing Two-Rotor Engine Tech To Satisfy America’s Thirst For Power

Mazda’s rotary engine is coming back in the spotlight, but this time it’s not just a nostalgic callback to the RX-7 glory days. Instead, it’s quietly shaping the brand’s electrified future. Rather than following the well-trodden EV playbook, Mazda is taking an unconventional route by engineering a two-rotor hybrid system to balance power, efficiency, and the ever-tightening noose of emissions regulations.

Mazda’s CEO, Masahiro Moro, recently revealed that the brand’s rotary engine development is accelerating toward a two-rotor configuration, addressing what he described as a critical shortfall of the single-rotor setup: it simply doesn’t generate enough power to meet the needs of the U.S. market.

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The news comes on the heels of another revelation, after the brand’s chief designer, Masashi Nakayama confirmed that the Iconic SP has been “designed with real intent to turn it into a production model in the not-so-distant future”. The Iconic SP’s hybrid setup also features a compact, dual-rotor rotary engine working as a range extender alongside an EV drivetrain. When unveiled in October 2023, Mazda boasted the system’s ability to reduce emissions by up to 90% when running on carbon-neutral fuels.

Two Rotors, One Goal: Power and Relevance

In an interview with Autonews, Masahiro Moro spoke about their rotary goals and the challenges of the project: “I want a rotary engine that complies with very stringent emission regulations. That is going to be a significant challenge. We are very close.”

The CEO added: “If we are thinking about the U.S. market, one rotor is not enough. Two rotors are needed to generate more power. We have tested with the single rotor. The next phase will be moving to two. The rotors spin separately in different chambers with one shaft. We need to generate more electricity. Two rotors will generate more power, which is more suitable to U.S. market characteristics.”

What’s less clear is which vehicle will house this new powertrain. While the description vaguely mirrors the single-rotor setup of the Mazda MX-30 e-Skyactiv R-EV, a more likely candidate is the dual-rotor hybrid drivetrain of the Iconic SP. With 365 hp (272 kW/370 PS) and an emphasis on efficiency, it seems better aligned with Moro’s aspirations for a vehicle that marries performance with sustainability.

Could the Rotary Engine Do More Than Charge?

While the CEO clearly referred to the twin-rotor rotary engine as a power generator, a patent drawing filed in June 2024 hints that Mazda may be exploring alternative applications for the technology.

The patent, reported by Japanese media Best Car, outlines a two-seater sports coupe featuring a rotary engine mounted behind the front axle, which delivers power to the rear wheels via a rear-mounted transaxle gearbox. The system also includes hub motors in the front wheels, drawing energy from a battery pack located behind the seats. Unlike the range-extender configuration, the electric motors can be switched off, allowing the rotary engine to act as the sole power source.

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This setup would mark a significant departure from the range-extender approach, offering a more traditional sports-car feel, something rotary purists would no doubt celebrate. However, such a design would face the same emissions hurdles Moro mentioned, unless Mazda doubles down on carbon-neutral fuels to make it viable for production.

Mazda’s Multi-Path Approach: Rotary, ICE, and Beyond

Mazda’s rotary developments aren’t happening in isolation. In May 2024, the automaker reaffirmed its dedication to internal combustion engines (ICEs) during the Multi-Pathway Workshop, collaborating with Toyota and Subaru on next-gen powertrains. Prototypes on display included both a twin-rotor range-extender system and a compact single-rotor engine, underscoring the brand’s determination to keep ICE technology relevant in an increasingly electrified world.