Wiseco K553M835 Forged Piston Kit for 1994-2005 Mazda Miata / Protege 1.8L

Vehicle Fitment

• 1994-2005 Mazda Miata / MX-5 (BP-ZE / BP, 1.8 L DOHC 16V)
• 1995-2003 Mazda Protege / 323 (BP-ZE / BP, 1.8 L DOHC 16V)

Features

• Forged from 2618 aluminum for high strength and reliability
• ArmorGlide® skirt coating reduces friction and wear
• Dished crown (-4.0 cc) lowers compression ratio for NA/tuned engines
• Precision ring grooves with anti-detonation design
• Strutted forging enhances structural integrity under load
• Forced pin oiling ensures proper wrist pin lubrication
• High-performance 8350XX piston ring set included
• Designed for racing, high-RPM, and lightly turbocharged applications

Specifications

• Bore: 83.50 mm
• Compression Height: 30.50 mm
• Piston Dish Volume: -4.00 cc
• Compression Ratio: ~8.4:1
• Wrist Pin Diameter: 20 mm
• Material: Forged 2618 aluminum
• Piston Set Quantity: 4
• Ring Set: 8350XX (1.0 / 1.2 / 2.8 mm)
• Approximate Piston Weight: 301 g

Included Components

• 4x forged pistons
• 4x 20 mm wrist pins
• 4x 8350XX piston ring sets
• 4x circlips / locking rings

Product Description

The Wiseco K553M835 is a forged piston kit engineered for Mazda's BP-series 1.8 L DOHC 16V engines, including Miata (1994-2005) and Protege / 323 (1995-2003). Constructed from 2618 aluminum, these pistons are designed for high-RPM durability, whether used in naturally aspirated, lightly tuned, or track-focused builds.

The -4.0 cc dish crown reduces compression to ~8.4:1, offering improved detonation resistance while maintaining strong performance characteristics. The ArmorGlide® coating minimizes friction, and strutted forging ensures structural strength under load. Forced pin oiling provides reliable lubrication of the wrist pins during heavy use.

This kit comes complete with pistons, wrist pins, circlips, and high-performance 8350XX ring sets, providing everything needed for a full four-cylinder engine build. Ideal for