Mazda RX-8 2004 - Side Housing Construction; Side Housing Outline

MECHANICAL
01–10–5
01–10
SIDE HOUSING OUTLINE
CHU011010908S03
• With the adoption of a side intake and exhaust port system, the exhaust ports have been moved from the rotor
housing to the side housing.
• Intake and exhaust port overlap has been eliminated on the side intake and exhaust port system by way of
independently set intake and exhaust port size configurations. As a result, stable combustion is achieved due
to the combustion gas not flowing into the intake process.
• With 2 exhaust ports per rotor, the current exhaust ports have approximately 2 times the exhaust port surface
area compared with the previous ports. Because of this, open-timing on the exhaust ports can be retarded
while maintaining sufficient port size. Therefore, the expansion process period has been increased, improving
heat efficiency and resulting in high engine output with reduced fuel consumption.
• Intake air resistance has been largely reduced by the approximate 30% expansion of the intake port surface
area compared with the previous ports. By retarding the close-timing of the intake ports, intake air volume has
been increased for higher engine output.
• With the adoption of side exhaust ports, non-combusted gas, which used to be swept by the apex seals, is sent
to the next combustion process for re-combustion, resulting in reduced exhaust from non-combusted gas.
End Of Sie
SIDE HOUSING CONSTRUCTION
CHU011010908S04
• To speed catalytic activation during cold-engine start, inserts have been installed in each exhaust port to
maintain the higher temperatures. Above each exhaust port is a secondary air port, which sends secondary air
close to the combustion chamber.
• The housing forms the engine outer core with the intermediate housing positioned between the two rotor
housings, which are further enclosed by front and rear housings. The components of the housing are
positioned precisely using tubular dowel pins.
INTAKE PORT
EXHAUST PORT
AUXILIARY PORT
(HIGH POWER ONLY)
EXHAUST PORT
EXHAUST PORT
SIDE EXHAUST
(RX-8)
PERIPHERAL
EXHAUST
(RX-7)
SIDE EXHAUST
(RX-8)
PERIPHERAL
EXHAUST
(RX-7)
EXHAUST PORT
EXHAUST PORT
NON-COMBUSTED GAS
ROTOR
NON-COMBUSTED GAS
ROTOR
EXHAUST PORT
B
D
C
B
D
C
T
D
C
INTAKE PORT
OVERLAP
PORT SURFACE AREA
PORT SURFACE AREA
SIDE EXHAUST
(RX-8)
PERIPHERAL
EXHAUST
(RX-7)
PERIPHERAL
EXHAUST
SIDE EXHAUST
SIDE EXHAUST
PERIPHERAL
EXHAUST
CHJ0110S004