HKS Single Valve Springs

2003–2007 Mitsubishi Lancer Evolution VIII/IX / 1989–1999 Mitsubishi Eclipse / 1990–1993 Mitsubishi Galant Turbo / 1989–1998 Eagle Talon Turbo

Part #: 22001-AM001

Overview

The HKS Single Valve Springs are high-performance upgrade components designed specifically for the 4G63 engine found in Mitsubishi vehicles such as the Lancer Evolution VIII and IX, Eclipse, Galant Turbo, and Eagle Talon Turbo. These springs are engineered to enhance your engine's valvetrain stability and durability, especially when paired with aftermarket camshafts and high-revving setups. Whether you're building a street performance car or a track-ready machine, these valve springs help support increased horsepower and torque by maintaining optimal valve control at higher engine speeds.

Manufactured by HKS, a renowned name in motorsports and performance tuning, these springs are crafted with precision to ensure consistent performance and reliability. They are an excellent choice for enthusiasts seeking to push their 4G63 engine beyond stock limits while maintaining engine integrity and smooth operation.

Key Features

HKS Single Valve Springs are designed with the performance enthusiast in mind, offering several key benefits:

• Constructed from high-quality materials to withstand the stresses of high RPM operation and aggressive cam profiles.
• Engineered to allow higher revving capabilities than stock springs, supporting increased engine power and responsiveness.
• Precisely wound to ensure consistent spring tension and prevent valve float at elevated engine speeds.
• Compatible with all aftermarket camshafts designed for the 4G63 engine, making them versatile for various build configurations.
• Designed for durability and long service life, even under demanding racing or spirited driving conditions.
• Manufactured with strict quality control standards to ensure reliable performance and fitment.

Construction & Design

The HKS valve springs are crafted from premium steel alloys, featuring a meticulously wound design that balances strength and flexibility. Their one-piece construction ensures uniform tension and reduces the risk of spring failure. The springs are engineered with a specific spring rate to optimize valve control without excessive wear on the valvetrain components. This design helps maintain proper valve seating and reduces the risk of valve float during high-RPM operation, which is critical for performance tuning and engine longevity.

Installation & Fitment

The HKS Single Valve Springs are designed as direct replacements for the stock springs on the specified Mitsubishi engines. Installation typically involves removing the cylinder head cover, compressing the existing springs, and replacing them with the new HKS units. No additional modifications or tuning are required, but it is recommended to inspect and replace related components such as valve seals and retainers if necessary. Proper installation ensures optimal performance and durability.

• Easy bolt-on upgrade for compatible Mitsubishi engines.
• No cutting, drilling, or complex modifications required.

What's Included

• Set of HKS Single Valve Springs for the 4G63 engine
• Installation instructions

Ideal For

• Performance enthusiasts building high-revving street or race engines
• Owners seeking to support aftermarket camshafts and increased horsepower
• Engine builders aiming for improved valvetrain stability and durability