Specifications
The Mazda RX-8 engine is powered by the 13B-MSP Renesis rotary engine, a 1.3-liter (654 cc × 2 rotors) naturally aspirated Wankel rotary unit known for its high-revving character and smooth power delivery. It typically produces 191–232 hp depending on the transmission and model year, with torque output around 159–162 lb-ft. Unlike piston engines, the compact rotary design allows the RX-8 to rev up to 8,500–9,000 rpm, contributing to its unique performance feel.
The Renesis uses side exhaust ports to improve efficiency and reduce emissions, and it is paired with either a 6-speed manual or 4/6-speed automatic transmission. Despite its relatively small displacement, the engine is known for high fuel consumption and requires careful maintenance —especially regular oil checks —due to the rotary’s oil-injection lubrication system.
Engine Variant
Renesis 4-Port
The Renesis 4-Port is the naturally aspirated version of Mazda’s RX-8 rotary engine. It has a 1.3-liter (1308 cc) displacement with a two-rotor design, featuring side intake ports. This engine produces around 197–212 hp at 8,000 rpm and 159–164 lb-ft of torque at 5,500 rpm, depending on the market. It uses a high-revving design with a 9.4:1 compression ratio, sequential multi-port fuel injection, and a lightweight aluminum rotor housing. Known for its smooth power delivery, high-revving characteristics, and a unique rotary design, the 4-Port Renesis emphasizes reliability and efficiency while maintaining the sporty performance Mazda is famous for.
Renesis 6-Port
The Renesis 6-Port engine is the high-performance version of the 13B-MSP, featured in manual-transmission RX-8 models. It includes two additional auxiliary intake ports that activate at higher engine speeds through electronically controlled actuators, dramatically improving airflow and high-RPM breathing. This design allows the engine to achieve higher power output, typically 232–247 hp, while maintaining the same compact 1.3L rotary architecture. The 6-Port variant is known for its sharp throttle response, stronger mid-to-high-range pull, and its ability to rev freely past 9,000 RPM in some trims. This configuration embodies the pure rotary experience, offering more aggressive performance for enthusiasts seeking the full capability of the Renesis design.
Frequently Asked Questions
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Are all RX-8 rotary engines Mazda RX-8?
Yes, all Mazda RX-8 models have a rotary engine. They come equipped with the 1.3L Renesis rotary engine.
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How much does a full-engine rebuild cost?
A typical engine rebuild may cost around $2,500 to $4,000, including parts and labour.
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How to install a RX-8 engine rebuild kit?
To install a RX-8 engine rebuilt kit, you need to follow these steps:
• Remove the engine
• Inspect and clean all components
• Install new seals and bearings
• Reassemble the engine
• Reinstall it and refill fluids
• Perform a proper break-in
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After how many miles should we change Mazda RX-8 engine oil?
Mazda RX-8 engine oil should be changed every 3000 miles after every 3 months.
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What makes the Mazda RX-8 Rotary engine unique?
The Mazda RX-8 rotary engine is unique for its compact design, high-revving capability, and smooth power delivery, but it requires meticulous maintenance.
RX-8 Engine
