Product Overview
High-performance dual valve spring kit manufactured from premium Chrome Silicon. Engineered for reliable high-RPM operation and motorsport applications. Eliminates valve float and maintains precise valve timing under extreme conditions.
Engine Applications
Fits: E34 5 Series · E36 3 Series (sedan / coupe / convertible) · E36 Compact 323ti · E38 7 Series · E39 5 Series · E46 3 Series · Z3 Roadster (E36/7) · Z3 Coupe (E36/8)
Engine codes
M50 — M50B20, M50B20TU, M50B24TU, M50B25, M50B25TU
M52 — M52B20, M52TUB20, M52B24, M52TUB24, M52B25, M52TUB25, M52B28, M52TUB28
M54 — M54B22, M54B25, M54B30
S50 / S52 / S54 — S50, S52B32, S54
What’s Included
- 24 × Inner Valve Springs
- 24 × Outer Valve Springs
- 24 × 6mm Chromoly Retainers
- 24 × Inner Valve Spring Locators
- 24 × Forged 21-4N Stainless Valves
Technical Specifications
Seating Pressure @ 37mm = 95lbs
Full Lift Pressure = 240lbs
Material Specifications
Valve Springs: Premium Chrome Silicon (CrSi) – Shot peened and heat treated for superior fatigue resistance
Retainers: 4130 Chromoly – Reduces inertia while ensuring long-term durability
Performance Rating: 8500 RPM capability
Lift Capacity: Up to 14mm camshaft lift
Application
Complete valve train upgrade for BMW S52 performance engines. Compatible with high-lift camshafts and performance builds.
Installation Notes
Professional installation recommended. Verify spring heights and valve travel to avoid coil bind.
