BMW M50 M52 S50 S52 Valve Spring Kit by Ferrea

Ferrea Valve Spring Kit – BMW M50, M52, S50, S52 Engines | 80lb Seat Pressure

Increase valvetrain stability and eliminate performance-robbing valve float with the Ferrea High-Performance Valve Spring Kit, engineered specifically for BMW M50, M52, S50, and S52 engines. This kit is built to withstand the demands of high-lift camshafts and sustained high-RPM operation—conditions where stock springs fall short.

Designed for High-RPM Performance

With a seat pressure of 80 lbs, this spring kit provides the control needed to keep valves operating precisely at elevated engine speeds. Ideal for naturally aspirated and forced induction setups, the increased pressure helps prevent valve float, maintaining power and combustion efficiency at redline.

Common Issues Addressed

• Valve Float: Prevents power loss and combustion instability at high RPMs.
• Spring Binding: Eliminates coil bind, which can lead to mechanical interference or spring failure.
• Spring Breakage: Reduces the risk of dropped valves and severe engine damage.

Precision Components for Demanding Builds

Ferrea valve springs are heat-treated, stress-relieved, and shot-peened to ensure consistent performance under extreme loads. The included CNC-machined chromoly retainers provide exceptional strength with reduced mass, helping maintain precise valve timing at speed.

The kit also includes Ferrea Spring Seat Locators made from durable 4140 chromoly alloy, finished with a Nitrided surface treatment to enhance wear resistance. These seat locators maintain exact tolerances and provide a flat, parallel surface for consistent spring seating and load distribution.

Ideal for High-Lift Cams and Performance Applications

Stock BMW valve springs are not designed to handle the stress of performance camshafts or forced induction. Upgrading to this Ferrea kit ensures reliable valve control, reduces the risk of failure, and supports increased horsepower and engine longevity.

Specifications:

• Seat Pressure: 80 lbs
• Engine Compatibility: BMW M50 / M52 / S50 / S52
• Included: Valve Springs, Chromoly Retainers, 4140 Seat Locators
• Application: High-lift camshafts, track and street performance builds

Installation requires the expertise of an engine builder.

BMW M50 Applications:

3 Series

1990-1995     E36     320i / 325i / 325is
1994-1996     E35/E36     318ti

5 Series

1990-1996     E34     520i / 525i
1991-1996     E34 Touring     520i / 525i

Z Series

1995     E36/E37     Z3 2.0i / 2.5i

BMW M52 Applications:

3 Series

1994-1999     E36     320i / 323i / 323is / 328i / 328is
1997-2000     E35/E36     318ti / 323ti

5 Series

1996-1998     E39     520i / 523i / 528i

7 Series

1996-1998     E38     728i / 728iL

Z Series

1996-1999     E36/E37/E38     Z3 2.0i / 2.2i / 2.8i

BMW S50 US Applications:

3 Series

1994-1995     E36     M3

BMW S52 Applications:

3 Series

1996-1999     E36     M3

Z Series

1998-2000     E36/E37/E38     Z3M