Mazda RX-8 13B-MSP Renesis 6-Port Engine & 6-Speed Manual Transmission

The Mazda 13B-MSP Renesis is a 1.3-liter, naturally aspirated twin-rotor Wankel rotary engine, exclusively produced for the Mazda RX-8 from 2003 to 2011. Unlike its turbocharged 13B-REW predecessor in the RX-7, the Renesis features revolutionary side exhaust ports (MSP – Multiple Side Ports) that eliminate intake/exhaust overlap, improve fuel efficiency, and reduce emissions while delivering a smooth 9,000 RPM redline. This listing includes the 13B-MSP engine paired with the close-ratio 6-speed manual transmission, the ultimate combination for rotary enthusiasts seeking the purest RX-8 driving experience.

• Side Exhaust Ports (MSP Design): Revolutionary redesign moving exhaust ports to the side plates rather than peripheral housing. This eliminates intake/exhaust overlap, reducing unburned hydrocarbon emissions and improving fuel efficiency by preventing fresh fuel from escaping out the exhaust. Exhaust port area is nearly double that of the 13B-REW.

• 6-Port Intake System (High-Power Models): Features three intake ports per rotor (primary, secondary, auxiliary) with S-DAIS (Sequential Dynamic Air Intake System) that opens ports progressively based on RPM. Primary ports only at low RPM, secondary at ~3,750 RPM, and auxiliary at ~6,250 RPM for maximum high-end power.

• Lightweight Rotating Assembly: Rotors are 14% lighter than the 13B-REW, and the flywheel is 20% lighter. This reduction in rotational mass enables rapid throttle response and allows the engine to safely rev to 9,000 RPM.

• Variable Intake System (VIS): Extends the intake manifold length at ~5,750 RPM to increase low-end torque. The Fresh Air Duct (FAD) valve opens at ~5,500 RPM to shorten the intake air gallery for high-RPM power.

• Twin Spark Plugs per Rotor: Two iridium spark plugs (leading and trailing) per rotor chamber ensure complete combustion of the long rotary flame front. Plugs should be replaced every 15,000-30,000 miles for optimal performance.

• High-Pressure Fuel Injection: 392 kPa fuel system pressure with 12-hole primary injectors and 4-hole secondary/auxiliary injectors for precise fuel atomization.

• Dual Oil Metering Pumps (Series 2): 2009-2011 engines feature electromagnetic oil metering pumps (EMOP) with 3 nozzles per rotor for more precise oil injection and improved apex seal lubrication.

• Award-Winning Design: The Renesis engine won the International Engine of the Year award in 2003 and was named to Ward's 10 Best Engines list for 2004 and 2005.

• Close-Ratio Gearing: Optimized for the rotary engine's high-RPM powerband, keeping the engine in the sweet spot between 7,000-9,000 RPM during aggressive driving.

• Factory Short-Throw Shifter: Crisp, precise shifts with minimal throw distance.

• Torsen Limited-Slip Differential: Available on Grand Touring and R3 trims for improved traction during corner exit.

• 50:50 Weight Distribution: The transmission and drivetrain layout contributes to the RX-8's legendary front-midship balance.

• 2004-2011 Mazda RX-8 (Base, Sport, Grand Touring, R3, Shinka, Evolve, PZ, Spirit R)

• Universal RWD rotary swap projects (requires custom mounts)

• 1x Mazda 13B-MSP Renesis Longblock (Complete 2-rotor assembly)

• 1x Intake Manifold with S-DAIS system and variable intake valves

• 1x Complete 6-Speed Manual Transmission (P60M or Series 2 specific)

• 1x Clutch and Flywheel Assembly (if included – verify)

• 1x Shifter Assembly with linkage

• 1x Wiring Harness (if included – specify generation)

• ECU, alternator, starter, ignition coils, and spark plugs.