CP Pistons Forged Piston Set - 2017-2022 Harley Milwaukee Eight 131ci (4.310" Bore, 11.0:1 Compression)

Build the ultimate Milwaukee Eight engine with CP Pistons forged piston set. Engineered for 131 cubic inch builds, these premium pistons feature 4.310" bore, 11.0:1 compression ratio, and race-proven construction for maximum performance and reliability.

Key Features:

• Forged aluminum construction
• 4.310 inch bore diameter
• 4.500 inch stroke compatibility
• 11.0:1 compression ratio
• 1.080 inch compression height
• 131 cubic inch displacement
• Precision CNC-machined
• Race-proven design
• CP-Carrillo quality and engineering

Performance Benefits:

• Maximum Strength: Forged construction withstands extreme cylinder pressures
• High Compression: 11.0:1 ratio delivers increased power output
• Precise Tolerances: CNC machining ensures perfect fit and seal
• Reliable Performance: Race-proven design for street and performance use
• 131ci Displacement: Optimized for big bore Milwaukee Eight builds
• Durable Construction: Forged aluminum resists heat and stress

Specifications:

• Brand: CP Pistons (CP-Carrillo)
• Part Number: M5120
• Product: Forged Piston Set
• Bore Diameter: 4.310 inches (109.47mm)
• Stroke: 4.500 inches (114.3mm)
• Displacement: 131 cubic inches (2147cc)
• Compression Ratio: 11.0:1
• Compression Height: 1.080 inches
• Material: Forged aluminum
• Construction: CNC-machined

Fitment Information:

• 2017-2022 Harley-Davidson Milwaukee Eight engines
• Displacement: 131 cubic inch builds
• Note: Requires proper cylinder boring and engine assembly
• Installation: Professional engine builder installation required

What's Included:

• CP Pistons forged piston set (complete set for engine)
• Piston rings
• Wrist pins
• Circlips
• Note: Gaskets and other engine components sold separately

Installation Notes:

• Professional engine builder installation required
• Requires cylinder boring to 4.310" diameter
• Verify piston-to-wall clearance specifications
• Install piston rings with proper end gap
• Use proper assembly lube during installation
• Follow torque specifications for all fasteners
• Verify compression height matches engine specifications

Forged Aluminum Construction:

CP Pistons are forged from high-quality aluminum alloy, providing superior strength compared to cast pistons. The forging process creates a denser grain structure that withstands the extreme cylinder pressures and temperatures in high-performance engines. Forged pistons are essential for modified Milwaukee Eight engines, especially those running higher compression ratios or forced induction.

11.0:1 Compression Ratio:

The 11.0:1 compression ratio provides a significant increase in power output compared to stock compression. Higher compression ratios extract more energy from each combustion cycle, resulting in increased horsepower and torque. This compression ratio is optimized for premium fuel and provides excellent performance for street and performance applications. The increased compression also improves throttle response and engine efficiency.

131 Cubic Inch Displacement:

The 4.310" bore combined with 4.500" stroke creates 131 cubic inches of displacement, a popular big bore configuration for Milwaukee Eight engines. The 131ci displacement provides substantial power increases over stock displacement while maintaining reliability. This displacement is ideal for riders seeking maximum performance from their Milwaukee Eight platform.

1.080 Inch Compression Height:

The 1.080 inch compression height is precisely engineered to work with the 4.500" stroke and achieve the proper deck height. Compression height is the distance from the center of the wrist pin to the top of the piston. This critical dimension ensures proper piston-to-head clearance and optimal combustion chamber geometry. The precise compression height is essential for achieving the specified compression ratio.

Precision CNC-Machined:

Every CP Piston is precision CNC-machined to exact tolerances, ensuring perfect fit and optimal performance. The CNC machining process creates consistent dimensions across all pistons, which is critical for balanced engine operation. The precise machining also ensures proper ring seal and optimal combustion chamber shape. This precision manufacturing is what separates CP Pistons from budget alternatives.

Race-Proven Design:

CP-Carrillo pistons are proven in the highest levels of motorsport, from drag racing to road racing. The technology and materials used in these pistons are derived from professional racing applications, ensuring they can handle the demands of high-performance street use. The race-proven design provides confidence that these pistons will perform reliably under extreme conditions.

Why CP Pistons (CP-Carrillo)?

CP-Carrillo is recognized as a world leader in high-performance piston manufacturing, producing pistons for professional race teams and serious enthusiasts worldwide. Their pistons are engineered using advanced materials and manufacturing processes, then tested extensively to ensure they meet the highest standards. CP Pistons are trusted by engine builders and racers for their quality, performance, and reliability.

Installation Tips:

• Work with experienced Milwaukee Eight engine builder
• Verify all clearances before final assembly
• Use quality piston rings with proper end gap
• Follow proper break-in procedure after installation
• Use premium fuel to support 11.0:1 compression ratio
• Consider upgraded valve train components for high-performance builds

Perfect For:

• 2017-2022 Harley Milwaukee Eight 131ci builds
• Performance engine builds seeking maximum power
• Engine rebuilds upgrading from stock displacement
• Racers demanding proven CP-Carrillo quality
• Anyone building serious Milwaukee Eight performance engine

Perfect For: 2017-2022 Harley Milwaukee Eight owners building 131ci engines seeking CP Pistons forged piston set with 11.0:1 compression.

Pro Tip: The 11.0:1 compression ratio requires premium fuel - ensure proper tuning for optimal performance and reliability.

Professional Installation: Requires cylinder boring and professional engine assembly. Includes pistons, rings, pins, and circlips.

Build your ultimate Milwaukee Eight with CP Pistons - forged construction, 131ci displacement, 11.0:1 compression, race-proven quality.