Wiseco K553M84 Forged Piston Kit for 1994-2005 Mazda Miata / 1.8L BP

Vehicle Fitment

• 1994-2005 Mazda Miata / MX-5 (1.8 L BP-ZE / BP, DOHC 16V)
• 1999-2000 Mazda Protege / 323 (1.8 L BP-ZE / BP, DOHC 16V)

Features

• Forged 2618 aluminum construction for maximum strength and reliability
• ArmorGlide® skirt coating reduces friction and wear
• Dished crown (-4.0 cc) for lower compression and tuning flexibility
• Fully machined crown for precise combustion and efficiency
• Precision ring grooves with anti-detonation groove for durability
• Strutted forging for added structural integrity under high load
• Forced pin oiling to ensure proper wrist pin lubrication
• Includes premium 8400XX high-performance ring set

Specifications

• Bore: 84.00 mm
• Compression Height: 30.50 mm
• Piston Dish Volume: -4.00 cc
• Compression Ratio: ~8.5:1
• Wrist Pin Diameter: 20 mm
• Piston Material: Forged 2618 aluminum
• Piston Set Quantity: 4
• Ring Set: 8400XX (1.0 / 1.2 / 2.8 mm)
• Approx. Piston Weight: 309 g each

Included Components

• 4x forged pistons
• 4x 20 mm wrist pins
• 4x 8400XX piston ring sets
• 4x circlips / locking rings

Product Description

The Wiseco K553M84 is a forged piston kit designed for Mazda's 1.8 L BP-series 16V engines, including Miata (1994-2005) and Protege / 323 (1999-2000). These 2618 aluminum pistons are built for high-RPM performance, reliability, and track-ready durability.

With a -4.0 cc dished crown, the kit lowers compression to ~8.5:1, providing improved detonation resistance and tuning flexibility. ArmorGlide® coated skirts reduce friction and wear, while strutted forging ensures strength under load. Forced pin oiling improves wrist pin lubrication for long-term reliability.

This complete kit includes pistons, 20 mm wrist pins, circlips, and premium 8400XX ring sets, giving you everything required for a full four-cylinder rebuild. Ideal for performance enthusiasts, track builds, or high-RPM street applications.