Rotary Engine / Parts Identification Guide
 

** 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

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

Rotors (cont.)

Rotors (cont.)

Non-Mazda Rotors

Snowmobile Engine (evanrude?)

Details

• Machined combustion chamber

http://rotarycarclub.com/rotary_foru...2&d=1377540110

http://rotarycarclub.com/rotary_foru...3&d=1377540233



Lawnmower

Details

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

http://rotarycarclub.com/rotary_foru...4&d=1377540383

Front Plates (cont.)

Front Plates (cont.)

Intermediate Plates (cont.)

Intermediate Plates (cont.)

End Plates (cont.)

End Plates (cont.)

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

http://rotarycarclub.com/rotary_foru...5&d=1377541068

http://rotarycarclub.com/rotary_foru...6&d=1377541257

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

http://rotarycarclub.com/rotary_foru...4&d=1375822419
http://rotarycarclub.com/rotary_foru...5&d=1375822498
http://rotarycarclub.com/rotary_foru...6&d=1375822546
http://rotarycarclub.com/rotary_foru...7&d=1375822589

Housings (cont.)

Front Covers (cont.)

13B 6PI (1986-1991)

Details

• Found in the non turbo variants of the Rx-7

http://rotarycarclub.com/rotary_foru...2&d=1377543612
http://rotarycarclub.com/rotary_foru...3&d=1377543704
http://rotarycarclub.com/rotary_foru...4&d=1377543774

Front Covers (cont.)

20B-REW

Details

• Found on the Eunos Cosmo
• Oil drain is front located.

http://rotarycarclub.com/rotary_foru...8&d=1377541982
http://rotarycarclub.com/rotary_foru...9&d=1377542032
http://rotarycarclub.com/rotary_foru...0&d=1377542091

Eccentric Shaft (cont.)

Eccentric Shaft (cont.)

Counterweights (cont.)

Counterweights (cont.)

Flywheels (cont.)

Flywheels (cont.)

placerholder 43

Seals (cont.)

Seals (cont.)

Oil Pans

10A (1967 - 1971)

Details

• Found in the early Cosmo, R100, some RX-3
• Small pan, about 14.75 inches in length.

Oil Pans (cont.)

Oil Pans (cont.)

Complete Engines


12AT

http://rotarycarclub.com/rotary_foru...9&d=1375373483

http://rotarycarclub.com/rotary_foru...0&d=1375373493

Complete Engines (cont.)

Complete Engines (cont.)

Adding some oddities!

I a still looking for information! The format I would like to follow can be seen within. If you have something I don't have listed, please take a high quality photo graph and send it to me for uploading. Credit will be given!