Mazda 13B-REW Rotary Engine – Bare Engine

JDM Mazda 13B-REW Bare Engine (Keg) – FD3S RX-7

Restore or build your dream rotary with this 13B-REW Bare Engine core. Often referred to as a “keg” or “long block,” this unit is the perfect foundation for enthusiasts who already have bolt-on accessories or are planning a high-horsepower single-turbo conversion. Sourced from the Japanese Domestic Market, this 1.3L twin-rotor engine is the legendary powerplant of the FD3S RX-7, prized for its high-revving nature and lightweight design.

What is a “Bare Engine”?

A bare engine includes the critical internal rotating assembly but excludes external bolt-on parts. This allows you to save on cost and shipping if you are swapping over your existing components.

• Included: Front, center, and rear irons; rotor housings; rotors; eccentric shaft; and oil pan.

• Not Included: Turbos, intake/exhaust manifolds, alternator, AC compressor, power steering pump, engine harness, and ECU.

Product Highlights

• Ideal for Rebuilds: The perfect starting point for a street port or bridge port project.

• Sequential Turbo Heritage: Originally designed for the world’s first mass-produced sequential twin-turbo system, featuring hardened apex seals and thin cast-iron rotors.

   

• Tested Core: Every used 13B-REW bare engine is inspected to ensure the irons and housings are within factory tolerances for a successful long-term build.

• High Power Potential: Capable of supporting 400–600+ HP with the right supporting modifications and professional tuning.

Technical Specifications