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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 Carbon Racing Clutch
FIA Formula 2 – Dallara F2 2024
The Clutch of Competence
Vehicle-specific for the Dallara F2 2024 spec chassis (from the 2024 season): the SACHS RCC 4/140 carbon racing clutch combines a minimal clutch diameter with very low rotating mass and outstanding thermal stability – ideal for the Mecachrome 3.4-L V6 turbo (~620 hp) and the Hewland 6-speed sequential gearbox.
ZF Race Engineering transfers top-tier technology from Formula 1, Super GT and WRC into the FIA F2 application. Focus: lowest weight, low moment of inertia and consistent friction across a wide temperature window – for repeatable launch performance, precise gearshifts and stable pace over Sprint and Feature races.
The RCC 4/140 meets the high continuous loads of the F2 calendar: durable launch robustness, quick rev-matching during shifts and resilient performance. System weight 2.44 kg, 0.00768 kg·m² – a measurable advantage for responsiveness and efficiency.
Benefits
maximum thermal resilience - carbon quality from Formula 1
very low weight and minimal moment of inertia
smooth and comfortable launch behavior
no flywheel wear
extreme durability - up to 4x longer than conventional sintered racing clutches
Lowest mass
One of the major strengths of a carbon racing clutch is its low mass and the resulting low moment of inertia.
They are designed for the lowest possible mass with the goal of transferring engine torque to the gearbox as quickly and directly as possible.
Lightening measures in the cranktrain that reduce the moment of inertia increase vehicle acceleration noticeably in the lower gears.
Faster acceleration
If, for example, the clutch has a moment of inertia (Mtm) of 0,061 kgm2, with a gearbox ratio of 13,4:1 (first gear ratio) this acts at the drive wheel with 180 times the value (13,42). Converting Mtm into vehicle mass results in an additional weight of approx. 145 kg in 1st gear that must be accelerated.
Thanks to the extremely low inertia of the SACHS carbon clutch, shift times are significantly reduced and the vehicle accelerates faster.
Maximum service life
For carbon clutches there are pressure plate and shim packs available that compensate carbon wear. With these compensation pressure plates the clutch can be reset to as-new condition - significantly extending service life.
Each unit undergoes stringent quality checks and is individually tested and measured before shipment. Preload force, installation height and release characteristics are documented. The preinstalled carbon stack thickness is also recorded - the included document supports maintenance and the shimming process (compensation pressure plates for refurbishment).
Technology
RCC 4/140 – Technical data
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Vehicle:
Dallara F2 2024 (FIA Formula 2, from 2024) - Engine / drivetrain: Mecachrome 3.4 L V6 turbo
Hewland 6-speed sequential - Release diameter [mm]: 38
- Release force [N]: 4,800
- Release travel [mm]: 4.5 + 0.5
- Mass (weight) [kg]: 2.44
- Moment of inertia [kg·m²]: 0.00768
Clutch housing
High-strength forged aluminium – optimised for maximum stiffness at minimal weight. The housing geometry supports efficient heat dissipation and stabilises the clutch pack’s temperature window – essential for the continuous loads of F2 operation (minimum weight 795 kg incl. driver/fuel).
Material: Carbon
Carbon offers high temperature resistance and consistent friction across a wide operating window. Its low density reduces rotating mass and inertia; good thermal behaviour enables rapid stabilisation – ideal for repeatable launches, tough pit-stop cycles and aggressive out-laps.
Hub spline
This RCC 4/140 is supplied with the correctly matching hub spline for the Dallara F2 2024 – precisely matched to the input shaft of the Hewland transaxle gearbox. Result: maximum fit accuracy, reliable torque transfer and long service life. Special solutions are available on request.
Scope of supply
RCS 140Y clutch cover (HA184), aluminium
4 × RCS 140Y carbon driven plates
5 × RCS 140Y carbon pressure plates
1 × RCS 140Y hub, steel
1 × RCS 140Y base plate, steel
1 × RCS 140Y pressure ring, steel
Quality Made in Germany
ZF Race Engineering has been among the technology leaders in motorsport for years. The combined know-how from top-tier racing flows directly into the development of carbon racing clutches. State-of-the-art manufacturing methods, the highest quality standards and motorsport technologies make carbon clutches the first choice for maximum performance and reliability - on circuit racing as well as in rally, formula and endurance applications.
Applications
Europe
FIA Formula 2 Championship (from 2024, on F1 support bill):
Imola, Monaco, Barcelona, Spielberg/Red Bull Ring, Silverstone, Budapest/Hungaroring, Spa-Francorchamps, Monza.
Asia / Pacific & Middle East
Bahrain (season opener), Jeddah, Melbourne, Baku, Lusail/Qatar, Abu Dhabi (finale).
Americas
The 2024 calendar includes no Americas rounds; focus on Europe, Middle East and Asia/Pacific.
Partners of ZF Race Engineering
