Mazda's only three-rotor makes one hell of a noise in proper racing spec.

20b, mazda 20b, rotary engine, rx-7, mazda rx-7, fd rx-7, three-rotor,
PAC Performance on YouTube

Every automotive enthusiast has an engine configuration they find particularly enthralling, but there are few among us who don’t share at least some appreciation for Mazda’s rotary engines. The high-revving automotive oddities are among the most interesting powertrains ever produced, and it can be made to be immensely potent with the right tweaks. Thanks to PAC Performance down in Australia, we now have a chance to hear this ridiculous 20B-swapped FD RX-7 race car sing the song of its people.

The 20B is the only three-rotor engine that Mazda ever put into production, and is often referred to by rotary fans as the “big block” of the engine family thanks to its massive 2.0-liters of displacement. The engine was produced exclusively for the brand’s domestic market range-topper known as the JC Series Eunos Cosmo. Less than 4000 of these luxury cruisers were built between 1990 and 1996, making the 20B a fairly rare engine by modern standards. Thanks to the first production use of sequential twin-turbos, the engine was rated at 276 horsepower and 296 lb-ft of torque. That output figure falls victim to the “gentleman’s agreement” surrounding horsepower in Japan during that era, with the 20B expected to make closer to 300 hp in reality. The built unit found in this RX-7 racer is making far more than that.

PAC Performance is located just outside of Sydney in nearby Revesby, New South Wales. The performance shop is a well-known commodity in the world of rotaries, thanks in part to the immense amount of billet machining work it does for these motors. According to Ingram Brothers Racing, this particular 20B features PAC billet center plates, reworked ports and redesigned internals. Despite what sounds like a large turbo in place of the factory twins, the engine does a great R26B impersonation. The choppy and erratic idle screams race car, a sentiment that is carried on once the revs begin to climb. Based on how the rest of the Ingram Brothers Racing setup looks on the dyno, this RX-7 is going to be a serious contender at any given track day.

20b, mazda 20b, rotary engine, rx-7, mazda rx-7, fd rx-7, three-rotor,
Ingram Brothers Racing on Facebook

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