The 13B Cosmo Rotary Engine – In-House Built is a professionally assembled performance rotary engine designed for enthusiasts who demand serious power, reliability, and precision engineering. Built using proven rotary performance techniques, this engine combines upgraded internal components with meticulous balancing to create a package capable of handling spirited street driving, track use, and high-horsepower applications.
Unlike a standard stock rotary engine, this build incorporates several performance-focused modifications, including doweled housings, half-bridge porting, lightened rotors, and a fully balanced rotating assembly. These enhancements work together to improve airflow, increase responsiveness, and support higher RPM operation while maintaining the durability expected from a properly engineered rotary build.
Whether you’re planning a Mazda Cosmo restoration, RX-7 conversion, dedicated track car, or custom rotary-powered project, the 13B Cosmo Rotary Engine – In-House Built offers a strong foundation for achieving impressive performance without sacrificing drivability.
Built by rotary enthusiasts for rotary enthusiasts, this engine delivers the character, sound, and performance that have made Mazda rotary engines legendary worldwide.
Opportunities to own an authentic early-production Mazda rotary engine are becoming increasingly rare. This Mazda 10A Rotary Engine – Used (Engine No. 0866) represents a significant piece of automotive history and offers enthusiasts, collectors, and restorers the chance to acquire one of Mazda’s pioneering Wankel rotary powerplants.
Originally developed during Mazda’s groundbreaking rotary engine era, the 10A was among the first production rotary engines to establish Mazda’s reputation for innovation and performance. Featuring a compact twin-rotor design with a displacement of 982cc, the 10A delivered impressive power and smoothness that set it apart from conventional piston engines of its time.
Whether you’re restoring a Mazda Cosmo Sport 110S, rebuilding a Mazda R100 Rotary Coupe, completing an RX-2 restoration, or simply adding a rare rotary engine to your collection, this engine offers authenticity, historical significance, and outstanding project potential.
Engine Number 0866 is being offered in used condition and is sold as-is, making it an excellent candidate for restoration, rebuild, preservation, or display purposes.
If you’re searching for an authentic classic Mazda rotary engine, this Mazda 10A Twin Wankel Rotary Engine – Used, Running Condition is an excellent opportunity to own one of the most iconic rotary powerplants ever produced.
Known for its lightweight design, smooth high-RPM operation, and unique rotary engineering, the Mazda 10A engine played a major role in establishing Mazda’s reputation among automotive enthusiasts worldwide. This particular engine was removed in running condition and remains a desirable option for restorations, vintage Mazda projects, rotary conversions, or collectors seeking a genuine period-correct powerplant.
The engine comes complete as pictured, including major external components such as the carburetor, ignition system, starter motor, and cooling system parts. Mounted on a sturdy metal frame for easier transport and handling, this unit offers a solid foundation for enthusiasts looking to preserve or revive a classic rotary-powered vehicle.
Whether you’re restoring a vintage Mazda RX-series vehicle, building a custom project, or adding a rare rotary engine to your collection, this Mazda 10A Twin Wankel Rotary Engine delivers authenticity and proven rotary heritage.
For enthusiasts restoring one of Mazda’s most iconic rotary-powered sports cars, finding an authentic early-production engine can be one of the most difficult parts of the project. This Mazda Savanna RX-7 SA22C GT – 12A Rotary Engine (P9-165 G S55) represents a rare opportunity to acquire a genuine first-generation RX-7 rotary engine removed from an original Japanese-market Savanna RX-7 GT.
The legendary 12A rotary engine helped establish Mazda’s reputation for innovative engineering and lightweight sports car performance. Compact, high-revving, and uniquely smooth, the 12A remains one of the most sought-after rotary powerplants among collectors, restorers, and vintage JDM enthusiasts.
This complete long block assembly offers an excellent foundation for an OEM restoration, period-correct build, museum-quality project, or rotary engine rebuild. As surviving examples become increasingly difficult to source, genuine SA22C engines continue to gain value among collectors worldwide.
