Balance Weight, Counterweight (At), Flywheel (Mt) Construction; Rotor Outline; Rotor Construction - Mazda RX-8 2004 Service Highlights

BALANCE WEIGHT, COUNTERWEIGHT (AT), FLYWHEEL (MT) CONSTRUCTION

• A balance weight and a counterweight (AT) have been installed to prevent dynamic unbalance.
• For MT, a weight has been added to perimeter of the flywheel to obtain the same balancing effect as the
counterweight on AT.
• The weight of balance weights for both MT and AT changes in accordance with the difference in rotation-
related mass of the transmission that is employed.
BALANCE WEIGHT
WEIGHT
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ROTOR OUTLINE

• Lightweight rotors have been adopted that correspond to the high-speed rotation for improved engine
response.
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ROTOR CONSTRUCTION

• The special cast iron rotors have a hollow interior structure.
• Reduction in rotor weight has been achieved by reducing the thickness of the ribs in the rotor interior.
• The outer surfaces of the rotor include rotor recesses that serve as the combustion chambers. (Bathtub shape)
• A rotor bearing has been installed to the interior wall of the central axial area because the wall rubs against the
eccentric shaft.
• Flank cuts are located at the corners of the rotor to delay exhaust closing timing by approx. 15 degrees,
improving exhaust efficiency.
RIB
INTERNAL GEAR
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MECHANICAL
MT
FLYWHEEL
INTERNAL GEAR
SPRING PIN
AT
BALANCE WEIGHT
ROTOR BEARING
CHU011011901S04
01–10
COUNTERWEIGHT
CHJ0110S011
CHU011011910S01
CHU011011910S02
FLANK CUT
ROTOR RECESS
DIRECTION OF
ROTOR ROTATION
CHJ0110S012
01–10–11