6.6L Duramax L5P Choate Pistons w/ Rings 40 Over 17-23 Coated, Flycut, Delipped Set.

Key Features and Fixes:

Choate Engineering Performance incorporates critical features to solve common performance constraints and provide a robust foundation for high-horsepower builds.

• Polyphen Coating Tops: The Polyphen Coated Tops act as a thermal barrier to reduce heat transfer into the piston material and oil.
• De-lipped Fuel Bowl: The piston crowns receive a crucial machining modification where the fuel bowl lip is de-lipped. This corrects the fuel spray trajectory to prevent impingement and remove potential hot spots, thereby significantly reducing the risk of piston cracking under high heat and pressure.
• Valve Clearance Solution: The flycut valve reliefs eliminate the common constraint of piston-to-valve interference encountered when using performance cams, allowing builders to confidently select higher lift camshafts.
• Performance Benefits: This heat reduction provides multiple benefits:
  • Lower EGTs (Exhaust Gas Temperatures)
  • Lower Oil Temps
  • Increased HP and Fuel Mileage
• Versatile Use: These pistons are suited for every day use and racing, making them ideal for the daily driver who occasionally tows or the dedicated track competitor.

Components and Parts:

This complete kit provides a ready-to-install solution built for durability under high-stress conditions.

• High-Strength Piston Castings: Built from robust materials capable of withstanding the elevated cylinder pressures and high temperatures common with aggressive tuning and high boost levels.
• Complete Ring Set: A full set of performance piston rings is included for each piston. These rings are designed for optimal cylinder sealing, maximizing compression, and controlling oil consumption.
• Wrist Pins and Locks: Includes heavy-duty wrist pins and corresponding locks (or retainers) for secure connection to the connecting rod.

Piston Set Includes:

• 8 Pistons with Ceramic Coated Tops
• Non-coated Piston Skirts
• 8 Pins
• 16 Locks

Machining Process:

The integrity and performance of these pistons are achieved through specialized machining processes focused on geometry, clearance, and quality control.

• Precision Flycutting: The piston crowns are flycut with precision-depth valve reliefs. This guarantees the necessary piston-to-valve clearance required when installing high-lift performance camshafts.
• De-lipped Fuel Bowl: The piston bowl edges are precisely machined (de-lipped) to optimize the fuel spray pattern and help prevent piston cracking by mitigating concentrated hot spots at the bowl lip.
• Piston Geometry: Each piston is machined to specific tolerances and weight-matched to maintain engine balance and ensure consistent performance across all cylinders.
• Piston Cycling: Each piston goes through vigorous quality cycles at our facility to ensure they meet stringent specifications before assembly and coating.