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1:1 compression ratio are engineered for aggressive forced induction and high-boost applications
they provide reliable performance in turbocharged and naturally aspirated K-Series engines
Nearly 40 years of real racing heritage
high compression and/or utilizing aftermarket competition cams
they ensure reliable operation under demanding racing conditions
Action Clutch Stage 5 Clutch for 06-11 Civic Si Action Clutch:Default Title 1:1 compression ratio are engineeredAction Clutch's lightweight flywheel engineered to deliver measurable performance gains through reduced rotational mass. The aluminum construction cuts weight enabling faster engine response, quicker acceleration, and improved throttle modulation. This upgrade minimizes drivetrain inertia for sharper shifts and enhanced rev matching capability. Ideal for drivers seeking responsive handling without sacrificing reliability or drivability in daily
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