HKS Outer Valve Spring Set

1991–2000 Infiniti G20 SR20DET 2.0L

Part #: 22001-AN002

Overview

The HKS Outer Valve Spring Set is a high-performance upgrade designed specifically for the Infiniti G20 equipped with the SR20DET engine from 1991 to 2000. Engineered to handle increased valvetrain stresses, this set is ideal for enthusiasts seeking to push their high-revving engines beyond factory limits while maintaining reliability and consistency. Whether you're building a spirited street car, a track-ready machine, or a dedicated performance build, these valve springs help support your goals by ensuring stable operation at elevated RPMs.

Designed with durability and precision in mind, the HKS Outer Valve Spring Set enhances your engine's valvetrain stability, reducing the risk of valve float and coil-bind during aggressive driving or high-RPM operation. This results in improved throttle response, consistent power delivery, and peace of mind during extended high-performance runs. If you're looking to maximize your SR20DET's potential, these springs are an essential upgrade that complements other performance modifications.

Key Features

The HKS Outer Valve Spring Set incorporates advanced materials and manufacturing processes to deliver superior performance and longevity. Key features include:

• Enhanced Durability: The springs undergo a stringent shot-peening and heat treatment process, which increases fatigue life and resists wear over time, ensuring reliable operation even under demanding conditions.
• Optimized Spring Rates: Designed to provide the right balance of preload and stiffness, these springs help prevent valve float at high RPMs, supporting increased engine power and revving capability.
• Precision Construction: Crafted with high-quality steel alloys, the springs maintain consistent spring rates and dimensions, ensuring precise valve control and reducing the risk of coil-bind.
• Compatibility: Specifically engineered for the SR20DET engine in the Infiniti G20, these springs are a direct replacement for OEM components, making installation straightforward for experienced technicians and DIY enthusiasts alike.
• High-Revving Support: Ideal for engines tuned for higher RPMs, turbocharged setups, or performance applications where valvetrain stability is critical.
• Reduced Valve-Float Risk: The improved spring design helps keep valves seated during aggressive acceleration, improving overall engine response and efficiency.

Construction & Design

The HKS Outer Valve Spring Set features a meticulously engineered design utilizing high-grade steel alloys that withstand the stresses of high RPM operation. The springs are shot-peened to induce residual compressive stresses, which significantly enhance fatigue strength and durability. Heat treatment further refines the material properties, ensuring consistent spring rates and resistance to deformation over time.

The springs are precisely manufactured with tight tolerances to ensure perfect fitment and optimal performance. Their compact, lightweight design minimizes additional load on the valvetrain, allowing for smoother operation and reduced wear. The set is engineered to work seamlessly with the stock or upgraded camshafts, supporting high-rev applications without coil-bind or valve float issues.

Installation & Fitment

The HKS Outer Valve Spring Set is a direct replacement for the OEM springs on the SR20DET engine in the Infiniti G20 from 1991 to 2000. Installation requires basic engine disassembly skills, including removing the cylinder head to access the valvetrain components. It is recommended to replace the valve seals and retainers during installation to ensure optimal performance and longevity. No special tuning or modifications are necessary, but verifying spring installed height and proper seat pressure is advised for maximum benefit.

• Easy bolt-on upgrade for experienced technicians and DIY enthusiasts
• Requires removal of the cylinder head for installation
• Compatible with OEM and aftermarket camshafts designed for high-RPM operation

What's Included

• Set of outer valve springs (quantity as specified for the engine)
• Installation instructions (if provided by HKS)

Ideal For

• High-performance street builds
• Track and racing applications
• Engine builders seeking increased valvetrain stability at high RPMs
• Owners upgrading their SR20DET for boosted or naturally aspirated high-rev setups