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Designed to make a
difference
ZF Race Engineering's SACHS motorsport clutches have stood for top-tier quality in international racing for decades. The ambition: continuous improvement and the drive to keep pushing the limits. From the lightest clutch used in Formula 1 to proven twin-plate and multi-plate systems in WRC, DTM, NASCAR, Le Mans and the Dakar Rally - ZF Motorsport technology is a core component of many winning cars worldwide.
SACHS Racing Clutch
FIA Formula 3 - Dallara F3 2025
Sintered Pads 5.2 mm - Vehicle-Specific For Dallara F3 2025
Compact, precise, durable: the SACHS RCS 2/140 S5.2 is optimized for the Dallara F3 2025 spec chassis (from 2025). Its 140 mm format and low rotating mass support rapid rpm changes and short shift windows - ideal for the 3.4 L Mecachrome V6 naturally aspirated engine (~380 hp, ~420 Nm) and the 3Mo 6-speed sequential transaxle.
The 5.2 mm sintered metallic pads provide high thermal capacity and wear reserve: a consistent bite point over long stints, reproducible engagement at elevated disc temperatures, and a calm, predictable pedal feel. Compared with thinner linings, the 5.2 mm design adds thermal headroom and service life - a plus on tracks with many launch and braking cycles.
The twin-disc configuration distributes friction work and temperature efficiently. A forged aluminum clutch cover (housing) delivers high stiffness at low mass; pressure and intermediate plates in high-strength steel ensure launch strength and endurance durability - precisely matched to FIA F3 requirements.
Advantages
High wear volume
High temperature resistance
Long operational life
Less Mass
One of the greatest strengths of the RCS sintered clutch is its low mass and the associated low mass inertia.
The SACHS RCS clutches have been designed for racing with the objective that torque is transmitted rapidly and directly from the engine to the gearbox.
Reducing the weight of the crankshaft drive to lower the moment of inertia will considerably increase vehicle acceleration performance in the lower gears.
Faster Acceleration
If the clutch itself has a moment of inertia (MoI) of 0.061 kgm2, the MoI on the drive wheel will be 180 times higher (in first gear) for a reduction in transmission of 13.4:1 (13.42). If we convert this value into vehicle mass, we arrive around 145 kg of additional weight to be accelerated in first gear.
As a result of the low moment of inertia of the SACHS RCS clutch, shifting times are considerably reduced and the vehicle accelerates much faster.
Technology
Technical Data RCS 2/140
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Vehicle:
Dallara F3 2025 3.4 L V6
FIA Formula 3, In Service From 2025 - Maximum Engine Torque [Nm] : 1,000
- Release Diameter [mm] : 38
- Release Force [N] : 4,200
- Release Travel [mm] : 4.5 + 0.5
- Mass (Weight) [kg] : 2.43
- Moment Of Inertia [kg·m²] : 0.00775
Clutch Cover (Housing)
RCS 140 housing made from high-strength forged aluminum. The geometry promotes heat dissipation and stabilizes the clutch pack temperature window; a wear-resistant hard coating reduces friction and fit wear and increases service life - suited to FIA F3 sprint and feature races.
Friction Lining
5.2 mm sintered metallic pads increase lining mass and thermal capacity. This lowers local hotspots, reduces fading and warpage risks, and keeps the friction coefficient stable over long duty cycles. Quick comparison: 2.6 mm (very agile, lowest rotating mass) - 3.4 mm (balanced) - 5.2 mm (maximum thermal reserve and longevity).
Hub Spline Profile
Vehicle-specific hub spline profile: for Dallara F3 2025 the clutch is supplied with the correct spline, precisely matched to the 3Mo transaxle input shaft. Result: maximum fit accuracy, reliable torque transfer, and durability. Hub lengths (short/medium/long) available for packaging optimization. Standard configuration (unless otherwise specified): long-long.
Scope Of Supply
RCS 140 Clutch Cover (HA140), Aluminum
1 × RCS 140 Pressure Plate (PP140), Steel
1 × RCS 140 Intermediate Plate (IP140), Steel
2 × RCS 140 Clutch Disc, Sintered Pads 5.2
Hub Length: Long-Long
Quality Made in Germany
ZF Race Engineering has been among the technology leaders in motorsport for years. The combined know-how from top-level racing flows directly into the development of RCS racing clutches. State-of-the-art manufacturing methods, the highest quality standards and motorsport technologies make ZF Motorsport clutches the first choice for maximum performance and reliability - on circuits as well as in rallying, touring and endurance racing.
Applications
Europe (FIA F3 From 2025)
Imola, Monaco, Barcelona, Spielberg/Red Bull Ring, Silverstone, Spa-Francorchamps, Hungaroring, Monza - F1 support program for FIA Formula 3 (Dallara F3 2025).
Asia/Pacific & Middle East
Melbourne/Albert Park (AUS), Sakhir/Bahrain - selected F1 support events for FIA F3.
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