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Choosing the Right Clutch

Choosing the Right Clutch

Choosing the correct clutch for your application requires knowing the estimated torque your engine will produce. Once you have an estimate of the torque your engine is producing, we recommend choosing a clutch that will handle at least 10 percent over the torque output of the engine. Torque capacities indicated in the application chart are calculated from pressure plate tests performed at ACT’s facility.

Understanding ACT's Part Numbers

Understanding the ACT alphanumeric coding of our products will help as you look through what ACT offers for your application. Here is a quick reference of how single-disc clutch kits are listed in ACT’s application chart and website.

Single Disc Clutch Kits

Sample Part Number: HA3-HDSS

HA3
Vehicle Application
Vehicle Application

The vehicle application code is usually the first letter of the make and the first letter of the model the clutch kit is made to fit. In the example above, the “H” stands for Honda and the “A” stands for Accord.

HD
Pressure Plate
Pressure Plate
  • SP - Sport Pressure Plate
  • HD - Heavy Duty Pressure Plate
  • XT - Xtreme Pressure Plate
  • XX - Maxx Xtreme Pressure Plate
SS
Clutch Disc Type
Clutch Disc Type
  • MM - Modified Street Disc
  • SS - Performance Street Disc
  • SD - Rigid-hub Street Disc
  • R4 - 4-Pad, Rigid-hub Disc
  • R6 - 6-Pad, Rigid-hub Disc
  • G4 - 4-Pad, Spring-centered Disc
  • G6 - 6-Pad, Spring-centered Disc

Pressure Plates

SP = SPORT PRESSURE PLATE

  • 10-30% clamp load increase
  • Stock to moderate pedal feel
  • Recommended disc type: Street

HD = HEAVY DUTY PRESSURE PLATE

  • 20-50% clamp load increase
  • Stock to moderate pedal feel
  • Recommended disc: Street / Race
  • Most popular choice

XT = XTREME PRESSURE PLATE

  • 40-120% clamp load increase
  • Moderate to stiff pedal feel
  • Recommended disc: Street / Race

XX = MAXX XTREME PRESSURE PLATE

  • 70-150% clamp load increase
  • Stiff to very stiff pedal feel
  • Recommended disc: Race

Performance Flywheels

STREETLITE FLYWHEELS

  • Most popular choice
  • Preferred for street & drag racing
  • Improved throttle response & acceleration
  • Considerably lighter than stock
  • Most durable ACT flywheel available
  • Good driveability

PROLITE FLYWHEELS

  • Preferred for road or rally racing
  • Quick throttle response & acceleration
  • Lightest with lowest inertia
  • Reduced driveability

Street Clutch Discs

MM = MODIFIED STREET DISC

  • Recommended for street or occasional race use
  • Quicker engagement
  • Quiet operation
  • Improved friction material

SS = PERFORMANCE STREET DISC

  • Recommended for street & race use
  • Quicker engagement & operation
  • Improved hub and burst strength
  • Most popular choice

SD = RIGID HUB STREET DISC

  • Recommended for street / race use
  • Minimum weight for faster shifts
  • Quick engagement, smooth & precise
  • Ultra-high burst strength

Race Clutch Discs

G4 = 4 - PAD

  • Recommended for road racing
  • Increased torque capacity, good durability and spline life
  • Quiet operation, reduced driveline shock
  • Harsh engagement, chatter

G6 = 6 - PAD

  • Recommended for road racing & high-powered street racing
  • Increased torque capacity, good durability and spline life
  • Quiet operation, reduced driveline shock
  • Harsh engagement, chatter
  • Most popular choice

R4 = 4 - PAD

  • Recommended for drag & road racing
  • Increased torque capacity
  • Fastest shifts, low inertia
  • Good durability, but shortened spline life
  • Harsh engagement, chatter
  • Gear noise

R6 = 6 - PAD

  • Recommended for drag & road racing
  • Increased torque capacity
  • Faster shifts, reduced inertia
  • Very good durability, but shortened spline life
  • Harsh engagement, chatter
  • Gear noise

SINTERED IRON

  • Recommended for clutchless shifting, drag race transmissions only
  • Very high torque capacity
  • Extremely durable and heavy
  • Harsh engagement, chatter
  • Gear noise