JDY Stage 1 Performance Diamond Pistons For G8X BMW S58

The JDY Stage 1 and Stage 2 Pistons are high-performance upgrades designed specifically for the BMW S58 engine platform. These pistons are engineered to handle extreme power outputs while offering enhanced durability and efficiency for high-performance and racing applications.

Available in stock bore size (84mm) with a 9.2:1 compression ratio, they deliver outstanding performance and reliability under the most demanding conditions.

These pistons are engineered for compatibility with Kelford stage 3 camshafts, which allow for more valve lift, requiring deeper valve pockets that JDY has specifically designed.

Key Features

Piston Design:

• Stock Bore Size: 84mm
• Compression Ratio: 9.2:1
• Material: Billet 2618 alloy for high strength and lightweight performance.
• Available Options: Stage 2 pistons (1800+ HP).

Wrist Pins:

• Material: H13 super hard alloy.
• Dimensions: 23mm diameter, 0.225-inch pin wall thickness.

Piston Rings:

Equipped with Total Seal piston rings, which are thicker than OEM rings for better sealing, improved oil control, and enhanced resistance to higher combustion pressures.

Groove Re-Design:

The piston ring grooves have been re-engineered for better heat management and durability, minimizing the risk of ring flutter and improving overall performance.
Optimized groove depth ensures reliable sealing while accounting for thermal expansion under high-stress conditions.

Valve Pocket Design:

Custom valve pocket grooves are designed to accommodate Kelford stage 1, 2, and 3 camshafts, allowing for better volumetric efficiency and greater valve lift without interference.

Stage 1 Pistons:

• Surface Finish: Standard Billet 2618 finish.
• Ideal for builds up to 1500+ HP.
• Durable and cost-effective solution for moderate high-performance applications.

Technical Specifications:

• Finished Bore Size: 3.307 inches
• Compression Ratio: 9.2:1
• Wrist Pin Diameter: 0.905 inches
• Wrist Pin Length: 2.250 inches