The 2004 Mazda RX-8 features the 13B-MSP Renesis rotary engine, a naturally aspirated 1.3-liter twin-rotor Wankel engine producing 238 horsepower at 8,500 RPM and 159 lb-ft of torque at 5,500 RPM. This revolutionary engine design uses triangular rotors instead of traditional pistons, allowing for an extremely high redline of 9,000 RPM. The Renesis was a significant improvement over previous rotary engines, featuring side exhaust ports for better emissions and fuel economy. Despite its small displacement, the engine’s unique design and high-revving nature provided sports car performance in a lightweight package.

The 2004 Mazda RX-8 shares most parts with 2004-2008 RX-8 models, as these represent the first generation with minimal changes. Engine components, transmission parts, suspension pieces, and most interior trim are interchangeable across these years. However, 2009-2011 models received a mid-cycle refresh with updated engine internals, revised suspension tuning, and different exterior styling components. While many mechanical parts remain compatible, body panels, lights, and some engine components may differ. The rotary engine itself underwent improvements in later years, so internal engine parts should be matched carefully by specific model year for optimal compatibility.

Parts availability changes daily. Call us at (603) 392-7313 or visit our online shop to check current inventory from this specific vehicle. If we have sold a part you need, our Parts Broker service can source it from our network of partner yards nationwide.

Yes! We ship parts from this vehicle and our entire inventory nationwide. Most orders ship within 1-2 business days via FedEx or freight carriers for larger components like engines and transmissions. Call (603) 392-7313 for a shipping quote on any part.

The 1.3L Renesis rotary engine in the RX-8 requires dedicated maintenance and understanding of rotary engine characteristics. While innovative and high-performing, it’s less reliable than conventional piston engines, with apex seal failure being the primary concern around 60,000-100,000 miles. Success depends heavily on proper maintenance including regular oil changes every 3,000 miles, allowing proper warm-up cycles, occasional high-RPM driving to clear carbon buildup, and checking oil levels frequently as rotary engines consume oil by design. Owners who understand these requirements and maintain them properly can achieve reasonable reliability, but neglect often leads to premature engine failure.