Rotary Engine / Parts Identification Guide

[Whizbang]

Rotors

10A (1967 - 1971)

Details

• Found in the early Cosmo, R100, some RX-3
• 9.2:1 or 9.4:1 compression ratio {conflicting reports}

12A (1971 - 1973)

Details

• Found in twin-dizzy cars
• Cast combustion chamber
• 9.2:1 compressionr ratio

12B (1974 - 1978)

Details

• Found in (74-78) RX-2 and (74-78) RX-3, with single dizzy.
• Cast combustion chamber

13B "AP" (1974 - 1980)

Details

• Found in the Rotary Pickup, RX-3 SP, RX-4 and Cosmo (RX-5 outside U.S.)
• Cast combustion chamber
• 9.2:1 compression ratio

12A (1978-1982)

Details

• Cast combustion chamber
• 9.4:1 compression ratio

12A (1983 - 1985)

Details

• Cast combustion chamber
• 9.4:1 compression ratio

12A Turbo (1982 - 1989)

Details

• Cast combustion chamber
• 8.5:1 compression ratio

13B GSL-SE (1984-1985)

Details

• Cast combustion chamber
• 9.4:1 compression ratio

13B 6PI - Series 4 (1986-1988)

Details

• Found in FC3S non-turbo models
• Cast combustion chamber
• 9.4:1 compression ratio
• 2mm Apex seal

13B Turbo - Series 4 (1986 - 1988)

Details

• Found in FC3S turbo models
• Cast combustion chamber
• 8.5:1 compression ratio
• 2mm Apex seal

13B 6PI - Series 5 (1989 - 1991)

Details

• Found in FC3S non-turbo models
• Machined combustion chamber
• 9.7:1 compression Ratio
• 2mm Apex seal

13B Turbo - Series 5 (1989 - 1991)

Details

• Found in FC3S Turbo Models
• Machined combustion chamber
• 9.0:1 compression Ratio
• 2mm Apex seal

13B-RE (1990 - 1995)

Details

• Machined combustion chamber
• 9.0:1 compression ratio
• 2mm Apex seal

20B-REW (1990 - 1995)

Details

• Machined combustion chamber
• 9.0:1 compression ratio
• 2mm Apex seal

13B-REW (1993 - 2002)

Details

• Found in all FD3S models
• Machined combustion chamber
• 9.0:1 compression ratio
• 2mm Apex seal

13B - MSP (2004 - 2012)

Details

• Found in all RX-8 models
• 10.0:1 compression Ratio
• 1mm Apex seal