Clutch Information
Clutch Diameters
Mazda pre-1982 12A / 13B: 215mm
Mazda 1983-1991 12A / 13B 6PI: 225mm
Mazda 1987-1988 13BT: 235mm
Mazda 1989-1991 13BT: 240mm
Mazda 1993-1995 13B-REW:
Mazda 04-current 13B Renesis: 236mm
***note: the S4 / S5 split has a 5mm difference STOCK. Performance clutches are all 240mm****
Types of Aftermarket Clutches
Flywheel Information
Identifying Flywheels
There are several versions of the OEM flywheel over the years. Each has different diameters, weights and markings.
Weights are approx.
1978-1980 12A--------------30lbs-------None
1981-1982 12A--------------23lbs-------21 **this flywheel is thinner and lighter than the rest and has a different pressure plate requirement**
1983-1985 12A--------------26lbs-------31
1984-1985 13B (GSL-SE)-----26lbs-------N304
1986-1988 Non Turbo 13B----24lbs ------N326
1989-1992 Non Turbo 13B----21lbs-------N350
1987-1988 Turbo 13B--------27lbs-------N318
1989-1992 Turbo 13B--------23lbs-------N370
1993-1995 Turbo 13B--------20lbs-------N3A1
Lightweight (Aftermarket) Flywheels
Aftermarket lightweight flywheels are a modification that is somewhat of a double edged sword. A heavier flywheel, in general terms, provides a smoother ride, better idle quality and an easier start from stop. A lightweight flywheel requires less energy to get moving which translates to move usable power and a faster run through the rpm range. Downsides that this can be reduced idle quality and some shuttering while driving, especially with ported cars. Can also mean more wear on the clutch due to the change in driving experience from a stop.
When buying an aftermarket flywheel, ask your self a few questions:
1. Does the flywheel come with the counterweight?
2. If it does, is it the right weight for what i need?
There quite a number of options for all years of the rotary engine. Some will not provide a counterweight with the flywheel. This is an important component since aftermarket flywheels bolt to the counterweight. Now, just because it may come with a counterweight, doesn't mean its even the weight you need. The counterweight is critical to balancing of the rotating assembly and the wrong counterweight can and will attached to your engine, but will not be the proper one to use. The best thing to do is source your own and personally assure that its the one you need.
Brands of Flywheels
ACT
ACT makes a nice flywheel in two different versions, BUT will only work with the turbo transmission. Also source your counterweight elsewhere since they are not well informed that different years require different weights.
Streetlite
Prolite
Fidanza
Fidanza is yet another good option. They do not include the weight of the counterweight in their calculations and require you to source your own counterweight.
Lightweight Steel
- 1987-1995 Turbo 13B Part #261941 18lbs
- 2004+ RENESIS 13B Part #261801 18lbs
Lightweight Aluminum
- 1986-1991 Non Turbo 13B Part #161991 8lbs
- 1987-1995 Turbo 13B Part #161941 10lbs
- 2004+ RENESIS 13B Part #161801 10lbs
Guru
Guru produces a 4140 Chrome Moly flywheel that is probably the top of the line thing you can buy. It uses a 5.5" style AP, Tilton or Quartermaster clutches.
Technical Specifications
Flywheel:
- Flywheel currently delivered for the RX7 Turbo case transmissions
- RX7 Generation 1-3 (Series I-VI)
- Direct fitment within bell-housing with no modifications necessary
- No ring gear as teeth directly cut onto flywheel
- Flywheel heat treated and black oxidised
Clutch:
- Suit AP, Tilton and Quarter Master (QM) 5.5" clutch assemblies
- Delivered with custom thrust bearings & mount as well as gearbox thrust bearing slider nose
Material:
- All component are precision manufactured
- 4140 Chrome Moly
- Heat treated and black oxidised
Guru 4140 Flywheel
10.1 lbs
16lbs
OEM Turbo II
27 lbs
44 lbs
Racing Beat
Racing beat sells an array of flywheels in either steel or aluminum. Their price includes the counterweight specific for your year and model engine!
Lightweight Steel
- 1974-1982 12A Part #11440 16lbs (compared to 30lbs [74-80] / 23lbs [81-82] stock)
- 1983-1985 12A Part #11441 16lbs (compared to 26lbs stock)
- 1984-1985 13B (GSL-SE) Part #11442 16lbs (compared to 23lbs stock)
- Rx-4 and Cosmo 13B Part #11450 16lbs (compared to 30lbs stock)
- 1986-1988 Non Turbo 13B Part #11444 17lbs (compared to 24lbs stock)
- 1989-1992 Non Turbo 13B Part #11447 17lbs (compared to 22lbs stock)
- 1987-1988 Turbo 13B Part #11445 17lbs (compared to 28lbs stock)
- 1989-1995 Turbo 13B Part #11446 17lbs (compared to 22lbs [89-92] / 19lbs [93-95] stock)
Lightweight Aluminum
- 1974-1982 12A Part #11452 12lbs (compared to 30lbs [74-80] / 23lbs [81-82] stock)
- 1983-1985 12A Part #11456 12lbs (compared to 26lbs stock)
- 1984-1985 13B (GSL-SE) Part #11457 12lbs (compared to 23lbs stock)
- Rx-4, REPU and Cosmo 13B part #11453 12lbs (compared to 30lbs stock)
- 1986-1988 Non Turbo 13B Part #11464 12lbs (compared to 24lbs stock)
- 1989-1992 Non Turbo 13B Part #11465 12lbs (compared to 227lbs stock)
- 1987-1988 Turbo 13B Part #11448 12lbs (compared to 28lbs stock)
- 1989-1995 Turbo 13B Part #11449 12lbs (compared to 22lbs [89-92] / 19lbs [93-95] stock)
- 2004+ RENESIS 13B Part #11468 12lbs (compared to 16.8lbs stock)
OS Giken
http://www.osgiken.net/products/supersingle.html
Counterweight Information
Identifying Counterweights
Series 5/6 (1989-1995) 0.498-0.510
Weight of Counterweights
4.0lbs