ACT HC4-SPR4 Sport/Race Rigid 4-Pad Clutch Kit for 1990-1991 Honda Civic and CRX

HC4-SPR4 kit features a Sport pressure plate for a nice upgrade. ACT Sport pressure plates use exclusive diaphragm design to increase clamp load, reduce deflection and maximize clutch life. All diaphragms endure a four-stage, heat-treating process for unparalleled performance. ACT pressure plates have precision cover stampings to provide rigidity and consistency. ACT's 4-pad rigid race discs are made with high quality, ceramic friction materials. The chrome-moly hub is heat-treated for strength and durability. The lightweight, rigid design allows for quicker shifts and smooth, trouble-free service. With the 4-pad rigid race disc, engagement is harsher, but shifting is faster. The 4-pad rigid race disc is well-suited for the smaller disc sizes in smaller engines. Sport/Race Rigid 4 Pad Light to moderate pedal effort, aggressive engagement, increased gear rattle; Moderate friction life, extended by ACT's exclusive diaphragm design, rigid design may increase spline wear; Carefully engineered, precisely assembled, accurately balanced, uses select ceramic friction materials for high heat tolerance and maximum performance; Recommended for race use only; 100% clamp load tested and dynamically computer balanced for smooth high RPM reliability

• "Excellence in Performance", backed by the best one-year warranty in the industry!

The ACT HC4-SPR4 Sport/Race Rigid 4-Pad Clutch Kit is engineered for race-focused applications requiring fast shifts, high heat tolerance, and dependable high-RPM performance. This kit combines an ACT Sport pressure plate with a rigid 4-pad ceramic race disc to deliver increased clamp load, reduced diaphragm deflection, and aggressive clutch engagement. It is designed for drivers who prioritize shifting speed and performance over smooth street manners.

The ACT Sport pressure plate uses an exclusive diaphragm design and a precision-stamped cover for improved rigidity, consistency, and clutch life. The diaphragm undergoes a four-stage heat-treating process, while every assembly is 100% clamp-load tested and dynamically computer balanced. The rigid race disc features select ceramic friction materials, a heat-treated chrome-moly hub, and a lightweight construction that supports quick, consistent gear changes. Engagement is harsher than a conventional street clutch and may increase gear rattle or spline wear, making this kit best suited for race use only.

This ACT clutch kit is designed to fit select 1990-1991 Honda Civic and Honda CRX applications. Verify transmission configuration, engine combination, and exact vehicle fitment before ordering. The kit is backed by ACT's one-year industry warranty and carries a Proposition 65 warning.

Product Specifications & Technical Data

• Brand: ACT
• Part Number: HC4-SPR4
• Clutch Type: Sport/Race rigid 4-pad
• Pressure Plate Design: Sport diaphragm pressure plate
• Disc Material: Ceramic friction material
• Hub Construction: Heat-treated chrome-moly
• Engagement: Aggressive engagement with faster shifting
• Recommended Use: Race applications only

What's Included

• ACT Sport pressure plate
• ACT rigid 4-pad ceramic race disc
• Clutch kit components required for the listed application

Features:

• Sport Pressure Plate: ACT's exclusive diaphragm design increases clamp load, reduces deflection, and supports extended clutch life.
• Rigid 4-Pad Race Disc: Ceramic friction material provides high heat tolerance, aggressive engagement, and rapid shifting performance.
• Heat-Treated Chrome-Moly Hub: Durable hub construction is engineered to withstand demanding race conditions.
• Balanced High-RPM Performance: Precision assembly, 100% clamp-load testing, and dynamic computer balancing promote smooth, reliable operation.

Fitments:
1989 Honda Civic Base
1989 Honda Civic DX
1989 Honda Civic LX
1989 Honda Civic Si
1989 Honda Civic Wagovan
1989 Honda CRX Base
1989 Honda CRX HF
1989 Honda CRX Si
1990 Honda Civic Base
1990 Honda Civic DX
1990 Honda Civic EX
1990 Honda Civic LX
1990 Honda Civic Si
1990 Honda CRX Base
1990 Honda CRX HF
1990 Honda CRX Si
1991 Honda Civic Base
1991 Honda Civic DX
1991 Honda Civic EX
1991 Honda Civic LX
1991 Honda Civic Si
1991 Honda CRX Base
1991 Honda CRX HF
1991 Honda CRX Si

Air Freight Prohibited: false
Not Carb Approved: false
Ltl Freight Required: false
Prop 65: Y
Part Type: automotive
Epa: N/A
Carb Acknowledgement Required: false
Regular Stock: false
Units Per Sku: 1