Rotary Engine / Parts Identification Guide

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** pics will appear starting tomorrow **

I am building this guide as a one-stop shop for identifying rotary parts. It is broken down by category (i.e. housings, rotors, front covers, etc) then again by model. There will be an "other" sub-section for non-Mazda wankel information as well.

The order of infomation might also get jossled around as time goes on to make a logically progression.

If anyone can provide missing information that would be excellent! Credit will be given. I just ask that for pictures the original be sent to me and be similiar in format (if able) to the pictures used here.

Thanks to RETed for information!

Contents

1. Rotors
2. Front Plates 1 2 3
3. Intermediate Plates
4. End Plates
5. Housings
6. Front Covers
7. Eccentric Shafts
8. Counterweights
9. Flywheels
10. Seals (Apex, Side)
11. Oil Pans
12. Oil Pumps
13. Complete Engines

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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

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Rotors (cont.)

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Rotors (cont.)

Non-Mazda Rotors

Snowmobile Engine (evanrude?)

Details

• Machined combustion chamber

Lawnmower

Details

• Really damn small
• Side seals only on ONE side of the rotor. This side is the "bottom" as the rotor lays flat.

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Front Plates

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Front Plates (cont.)

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Front Plates (cont.)

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Intermediate Plates

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Intermediate Plates (cont.)

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Intermediate Plates (cont.)

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End Plates

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End Plates (cont.)

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End Plates (cont.)

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Housings

Early 12A housings

There are actually differences between the front and rear housings.

The rear has "TCP" case into the top.


13B-PP Mazda Factory Racing Housings

Details

• Available through Mazda Motorsport
• "Mazda Motor Company Hiroshima Japan License NSU-Wankel" sticker on spark side / top
• "13B Mazda" cast on edge
• Unique, somewhat rough casting.
• Dual Oil Injector ports

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Housings (cont.)

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

Details

• Found in FC3S non-turbo models
• "Mazda Motor Company Hiroshima Japan License NSU-Wankel" cast on top
• "13B Mazda" cast on edge
• "Diffuser" in exhaust sleeve
• Single Oil Injector port