Wiseco K590M835 Forged 83.50 mm Pistons for 1994-2005 Mazda Miata/MX-5 1.8L

Vehicle Fitment

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

Features

• Forged 2618 aluminum alloy construction for strength and durability
• ArmorGlide® skirt coating reduces friction and prevents seizure
• Strutted forging design for high-load strength
• Precision-machined crown with valve pockets
• Anti-detonation groove to help prevent engine knock
• Forced pin oiling for wrist pin lubrication
• Pre-gapped plasma-moly piston ring set included
• Designed for high-RPM performance and racing applications

Specifications

• Bore Diameter: 83.50 mm (3.287")
• Stroke: 85 mm
• Compression Height: 30.50 mm
• Dome Volume: ~7.00 cc
• Compression Ratio: ~9.94:1
• Wrist Pin Diameter: 20 mm
• Piston Weight: ~288 g
• Deck Clearance: ~0.50 mm

Included Components

• 4x Forged pistons
• 4x Wrist pins (20 mm)
• 1x Pre-gapped piston ring set (1/16, 1/16, 3/16)
• Piston locks / circlips

Product Description

The Wiseco K590M835 is a high-performance forged piston set built for Mazda 1.8L BP series engines, including the Miata MX-5 and Protege. Crafted from 2618 alloy, these pistons are lightweight yet strong, ideal for high-RPM and racing applications. The ArmorGlide skirt coating reduces friction, improves durability, and resists seizure under extreme conditions.

With an 83.50 mm bore, 30.50 mm compression height, and 7 cc dome volume, these pistons achieve a compression ratio of approximately 9.94:1. They include forced pin oiling for wrist pin lubrication and come with a pre-gapped plasma-moly ring set for optimal sealing and performance.

This set is designed for performance builders seeking reliable, long-lasting pistons for naturally aspirated or moderately boosted BP engines. Ideal for track or street applications, they provide superior strength and durability compared to stock pistons.