Page 8 of Clutch and Flywheel by Mazda MotorSports

moment of inertia moment of inertia with respect to rotation is called angular momentum angular momentum is the force that has to be overcome to spin a circular component e.g a flywheel and clutch it is the function of the mass of the part and the radius on which the mass is positioned the more centered the mass is on a circular part the lower the angular momentum and the less horsepower is needed to spin the part this translates to the flywheel/clutch assembly being able to accelerate faster at every rpm range for example quarter master s aluminum flywheel and 7-1/4 aluminum clutch unit together are rated at 146.3 inch-pounds in other words the assembly requires approximately 146.3 inch-pounds of force to initiate movement qm s aluminum flywheel and the new compact 5-1/2 aluminum clutch unit require approximately 101 inch-pounds of force to initiate movement a 30 reduction quarter master aluminum flywheel ­ part #4352-11-752a quarter master flywheels part number 4352-11-752a code c req 1 description aluminum flywheel ­ 7-1/4 bottom mount model engine type 12a 13b year all notes 1-piece lightweight aluminum flywheel with integral ring gear can be used with any 7-1/4 borg beck style clutch approximate weight 3.5 lbs 116 teeth similar to part #4352-11-752a for top-mount starter applications approximate weight 3.5 lbs 116 teeth lightweight 1-piece flywheel can be used with any borg beck style clutch integral ring gear provides a lower moment of inertia than 2-piece steel flywheels requires use of modified rear counterweight part #0000-01-9152 approximate weight 3.1 lbs 116 teeth 4801-11-752a c 1 aluminum flywheel ­ 7-1/4 top mount 12a 13b all 0000-02-9201 c 1 steel flywheel ­ 7-1/4 bottom mount 12a 13b all 0000-02-9202 c 1 aluminum flywheel ­ 5-1/2 bottom mount 12a 13b all note using a lightweight flywheel requires the use of a rear automatic transmission counterweight see counterweight section for part number listing page e-19 cf-8

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