Mazda RX-8 Camshaft Replacement Parts

No — the RX-8 uses a Wankel rotary engine (the Renesis 13B-MSP), which has no pistons, no valves, and therefore no camshaft at all; the rotary combustion cycle simply does not use this component. If you are looking for a rotating or timing-related part, you may be thinking of the eccentric shaft, which is the rotary engine's functional equivalent to a crankshaft. For ignition timing or metering components, parts like the distributor or throttle body are more likely what you need. Please search for the correct rotary-specific part, or describe your symptom to a breaker who specialises in rotary engines for the right guidance.

Almost certainly yes — because the Renesis 13B rotary engine in every RX-8 sold in the UK has no camshaft, no garage working on a genuine RX-8 should be quoting for one. The eccentric shaft is the closest rotary equivalent and is a common wear or damage item, so that is the most likely candidate if timing or internal engine work is being discussed. It is also worth confirming the vehicle really is an RX-8 and not a different Mazda, as some Mazda models of a similar era do use conventional piston engines with camshafts. Ask the garage to clarify which specific component they are referring to before ordering any parts.

This question does not apply to the RX-8, because neither the early (2003–2008) nor the facelifted (2008–2012) model was ever fitted with a camshaft — both generations use the same Wankel rotary Renesis 13B-MSP engine, which contains no camshaft. If you are trying to swap an internal rotating component between those two generations, the eccentric shaft is the part you should be researching. Generation and engine-code compatibility questions for genuine rotary-specific parts are still valid and worth raising with a breaker who stocks RX-8 engines. Always confirm the engine code from your V5 or a VIN check before ordering any internal engine part.

No trim level of the RX-8 — including the entry-level, Sport, or limited-edition PZ — ever used a camshaft, because every UK-market RX-8 was powered exclusively by the Renesis 13B rotary engine regardless of specification. Trim differences on the RX-8 affect interior equipment, bodykit, and wheel choice, not the engine architecture. This means no variant of this model is a source for a camshaft, and searching for one by trim level will not change that outcome. If you need an internal engine component, speak to a rotary-specialist breaker with your engine code to hand.

There is no such thing as an RX-8 camshaft from any market — the 13B-MSP Wankel rotary engine used worldwide in the RX-8 does not contain a camshaft in any specification or any country. Import or grey-import RX-8s are therefore equally irrelevant as a source for this part. If you are sourcing internal engine components from an overseas RX-8, the eccentric shaft, apex seals, or rotor housings are the parts with real-world equivalents to research. A breaker with rotary experience can advise on whether overseas engine specs match your UK car's requirements.