Brand: Quarter Master
Manufacturer's Part Number: 221591R
Part Type: Clutch Kits
Product Line: Quarter Master Optimum-SR 10.4 in. Twin-Disc Clutch/Flywheel/Release Bearing Kits
Automotive Fittings Part Number: QTM-221591R
Clutch Usage: Performance
Clutch Disc Quantity: 2
Flywheel Included: Yes
Disc Diameter (in.): 10.400 in.
Throwout Bearing Included: Yes
Throwout Bearing Style: Hydraulic
Alignment Tool Included: Yes
Pilot Bushing Included: No
Flywheel Material: Billet steel
Counterweight Assist: No
Mounting Hardware Included: Yes
Quantity: Sold as a kit.
Description:
Optimum-SR 10.4 in. twin-disc clutch/flywheel/release bearing kits continue the winning ways of a leader in driveline technology, Quarter Master. With lessons learned from racing, and with the data from extensive drivability testing, Optimum-SR clutches are available for street use. The se lighter-than-stock clutches feature a spring designed to require only a 10 percent increase in pedal effort over stock, with stock-type modulation control, and they are capable of handling 1400 hp and 1000 lbs.-ft. of torque.

Features include:

* Sprung hub, marcel-type discs with organic rag-type friction for smooth engagement
* Vented floater plate and grooved friction surfaces provide better cooling
* Aircraft-grade bolts and hardware
* All-billet construction
* Completely re-buildable
* Can be used with OE hydraulic bearing systems or Quarter Master Tri-Lite II hydraulic release bearings