Different diameter throw-out bearings are available, these can be used to tune the pedal characteristics as well. The small diameter bearing is a longer throw and lighter pedal, the big diameter bearing gives a shorter throw and stiffer pedal. The engagement characteristics can be tuned with the diaphragm spring, pressure ring fulcrum position, and the throw-out bearing diameter.
PTT has optional vented low inertia floaters in between the friction disks.
Besides from choosing from many thicknesses and angles of diaphragm spring to determine your clamping force, Gary can fine-tune the clamping force by bending the spring in this fixture. The fixture also confirms the rate of the diaphragm spring.
PTT has 3 types of disc friction materials you can choose from. Organic on the top is the smoothest and the least abrasive on the pressure rings, flywheel, and floaters. Bronze metallic is next with good friction, great heat-resistant characteristics, decent smoothness, and good wear. Organic and Bronze metallic have approximately a 400 lb-ft torque capacity with a 7.25″ clutch. Finally, there is sintered iron on the bottom. Sintered iron has the highest torque capacity, the best wear of the disc, and the highest heat resistance. Even though it is the most aggressive it is still relatively smooth. It wears the least but wears the pressure rings, floaters, and flywheel the most. This wear of other components isn’t that bad. With a 7.25″ clutch it offers about 550 lbs of torque capacity so sometimes you can use one less disc for less inertia without losing much torque capacity. PTT plans to have super light carbon carbon discs sometime in the future.
1 comment
Very Nice Post