Bourne HPP K-Series Lightened Chromoly Steel Flywheel

Bourne HPP K20 Lightened Flywheel

Optimize your K-Series drivetrain for competition with the Bourne HPP Lightened Flywheel. Engineered specifically to meet the weight requirements of Civic Cup regulations, this flywheel is precision-balanced to a minimum weight of 3.5kg.

Crafted from a single piece of 4140 forged chromoly steel, this flywheel offers double the strength of standard billet steel. By significantly reducing rotating mass and inertia, it unlocks faster engine responsiveness and quicker rev-matching. Unlike aluminium alternatives with pressed-on ring gears that can separate under load, this unit features ring gear teeth milled directly into the one-piece chromoly forging for ultimate reliability.

Key Specifications

• Fitment: Honda K-Series Engines

• Weight: 3.5kg 

• Material: 4140 Forged Chromoly Steel

• RPM Limit: Tested to 12,000 RPM

• Safety Standard: Exceeds SFI 1.1 Specifications

• Design: CAD Designed, CNC Machined & Computer Balanced

Performance Features

• Enhanced Responsiveness: Meticulously engineered to minimize inertia, allowing the engine to rev freely and respond instantly to throttle inputs.

• Optimized Cooling: Features unique design elements that promote airflow around the clutch assembly, improving heat dissipation during heavy track use.

• Extreme Durability: Built to withstand heavy-duty usage, this flywheel has been rigorously tested at speeds up to 12,000 RPM. The one-piece construction ensures no risk of ring gear separation.

Compatibility

This Lightweight Chromoly flywheel is designed for versatility and is compatible with a wide range of clutch kits, including:

• Exedy

• ACT

• Fidanza

• Clutchmasters

• OEM Honda Clutch Kits