![]() The second-generation RX-7 was a technological marvel in the early 1990s. It features a dual-level intake manifold, which created a supercharger-like effect from Helmholtz resonance and improved power by almost 25%. This particular vehicle featured two levels of opening and closing ports on its air filter box where it derived supercharger-like power from Helmholtz resonance, much better than what we’re accustomed to.įurthermore, the 13B-RESI engine is a tribute to the most powerful naturally aspirated boxer engines in existence. RESI stands for Rotary Engine Super Injection. 1974 – 1977 Mazda REPU (Rotary Engine Pickup)Ī tuned intake manifold was used in a Wankel engine for the first time with an even more impressive effect when fitted onto 13B-RESI.Cars using this type of auto have used the “AP” name since 1974-1980. The first 13B engines had carburetor fuel systems and single distributors in their ignition systems, fitting because these cars are also known as AP. Compression Ratio: 9.4 and 8.5 (Turbo engine).This last appearance of this legendary powerplant would also mark its swan song, though, since 1995, there were no longer any US market cars available equipped as such… Engine Specifications and Design: When it retired from sedans, it resurfaced again in 19 with RX-7 GSL-SE models before being used once more for two years from 1987 to 1989.ĭuring that time, only naturally aspirated or turbocharged options could be purchased at that point due to its close ties to Toyota’s Supra racing program.īut then disappeared yet again until 1992 where twin turbos made their return. ![]() The 13B was a popular engine in the United States from 1974 through 1978. The Mazda 12A has no relation to this newer design, instead of being an elongated version that measures 80 mm thick with 654 cc in each chamber (1/2 of one rotor).įor those who are not aware or need a refresher, earlier versions like 12A engines which had thin 90mm rotor thickness, the Mazda 13B increased this amount to create 80 mm blades as well, according to top researchers who study these things closely. The Mazda 13B rotary engine is the most widely produced, and it has been used for over 30 years. It powered many of their models, including the RX-7 – a legendary Japanese sports car that defined rotary power for generations before them with its signature sound. However, they differ in the total displacement since the total displacement of the two chambers is 1308 cc. The Mazda 13B engine is like the longer version of the Mazda 12A Rotary engine. ![]() ![]() It looks like they’re going all out because, after years of hinting at reinvolvement, this time around, there’s no holding them down. Rotary engines are back, and Mazda has abandoned its current lineup to focus on hydrogen-based rotaries. This same trait in their development history was where the Mazda designers and engineers were at the forefront of new technologies like internal combustion engines or electric cars for decades before they became popularized today.Ī perfect example would be how Skyactiv-X engine technology from years ago helped keep diesel on life support by providing an efficient alternative while being more eco-friendly than regular gasoline-fueled ones – all without sacrificing performance. Mazda has always been a company that’s not afraid to take risks. ![]()
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