Mazda RX-8 2004 Service Highlights page 4

Engine - the "RENESIS" - a new-generation rotary engine
• Engine
— 13B-multi side port (MSP) (High power and Standard power), new-generation rotary engine has been
adopted.
— Side exhaust system has been adopted by transferring the exhaust ports from the rotor housing to the side
housing.
— The intake port area has been in increased by 30% over previous rotary engines. This results in reduced
intake resistance and increased air flow which makes more power.
— Cut-off seals have been provided between the oil seals and the side seals of the rotors, preventing
combustion gas from flowing into the intake air process.
— Keystone-shaped (wedge-shaped) side seals have been adopted for increased sealing performance.
— Ribs in the side housing and rotors have been decreased in thickness and weight while maintaining high
rigidity.
— Spark plugs with iridium tips have been adopted for improved heat resistance and durability.
— Flank cuts on the corners of the rotors provide improved exhaust efficiency by delaying the exhaust-port
closing timing.
AUXILIARY PORT
(HIGH POWER ONLY)
INTAKE PORT
EXHAUST PORT
• Intake and control
— Sequential dynamic air intake system (S-DAIS) has been adopted, realizing powerful output at high engine
speed provides a wide-range of torque in the low and medium-speed ranges through full use of air intake
pulsating unique to the rotary engine.
— Large, low-resistance air cleaner and variable fresh air duct (VFAD) (High power only) have been adopted.
HIGH POWER
VARIABLE DYNAMIC EFFECT
INTAKE VALVE
INTAKE MANIFOLD
SECONDARY SHUTTER VALVE
GENERAL INFORMATION
SIDE EXHAUST
PERIPHERAL EXHAUST
THROTTLE VALVE
AIR CLEANER
AUXILIARY PORT VALVE
(RX-8)
EXHAUST PORT
(RX-7)
EXHAUST PORT
VARIABLE FRESH AIR DUCT
FRESH AIR DUCT
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CHU0000S013
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