09-26-2008, 10:20 AM
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Join Date: Jul 2008
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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 
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 
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:
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
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
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