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Description
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| Installation Instructions | Service Information |
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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
RCS 2/140 S2.6
Sintered metallic 2.6 mm, rigid version
Focused on response and packaging efficiency, the twin-plate SACHS RCS 2/140 S2.6 leverages the compact 140 mm diameter for very low moment of inertia, short shift windows and a clean rev build-up - ideal for formula series, prototypes and circuit setups with tight packaging.
The 2.6 mm sintered metallic friction linings prioritise agility: minimal rotating mass, fast thermal reset phases and direct torque transfer. Quick comparison for context: 3.4 mm offers more thermal buffer and wear reserve while responding a bit smoother - 5.2 mm sintered pads maximise reserve and durability but increase inertia and response time. The 2.6 mm layout targets rapid gear changes, precise modulation and consistent performance under frequent load changes.
In this configuration the RCS 2/140 S2.6 transmits up to 960 Nm maximum engine torque. The small diameter delivers high torque density, while two friction discs distribute work and temperature. The forged aluminium clutch cover (housing) provides stiffness at low mass; pressure and intermediate plates in high-strength steel ensure launch and endurance strength.
Advantages
Light
low clutch height
Low mass and inertia
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.
The Technology
Technical data RCS 2/140:
- Maximum engine torque [Nm] : 960
- Release diameter [mm] : 49 / 38
- Release force [N] : 4.900 / 4.200 (⌀ 38)
- Release travel [mm] : 4.0 +0.5 / 4.5 +0.5 (⌀ 38)
- Mass (weight) [kg] : 2.27 / 2.31 (⌀ 38)
- Moment of inertia [kgm2] : 0.006920 / 0.007051
Clutch cover (housing)
Forged aluminium housing with high stiffness at low mass - the housing geometry supports heat dissipation and stabilises the clutch pack's temperature window. A wear-resistant hard coating reduces friction and fit wear and increases service life.
Clutch lining - sintered metallic
Sintered metallic in a 2.6 mm layout minimises rotating mass and thermal inertia. This improves rev build-up, shortens speed equalisation and keeps pedal feel clear - particularly valuable in sprint stints and tight tracks with frequent load changes.
Context: 3.4 mm provides more thermal capacity and service life with slightly calmer response; 5.2 mm sintered pads offer maximum reserve and heat buffer yet come with higher inertia. 2.6 mm focuses on agility and quick thermal reset phases.
SACHS RCS hub
The RCS 2/140 S2.6 is available with different hub splines precisely matched to the respective gearbox input shaft. Available hub lengths (short, medium, long) enable optimal packaging and correct actuation. The modular RCS 140 system allows precise matching for performance, thermal robustness and service life Standard specification of the RCS 2/140 clutch (unless otherwise specified): hub length long-long.
Scope of delivery
RCS 140 clutch cover (HA140), aluminium
1x RCS 140 pressure plate (PP140), steel
1x RCS 140 intermediate plate (IP140), steel
2x RCS 140 clutch disc, sintered 2.6
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
CIRCUIT / TOURING CARS
Super GT, ELMS,
DTM, STCC, NLS, TCR, GT World Challenge etc.
FORMULA
Formula Ford,
Formula 3, Formula 4 etc. (RCS115/140)
RALLY
GT2 European Series,
WRC, ELMS, DRM, BRC, FRC etc.
Installation instructions:
As SACHS RCS clutches have not been developed specifically for a vehicle, but are vehicle-independent, the vehicle must be adapted to the clutch (see PDF documents above). The contour of the flywheel, the position, the travel and the shape of the release mechanism as well as the maximum available installation space must be checked and adapted if necessary.
Required information:
When ordering your SACHS RCS clutch, the required profile of the transmission input shaft must be specified. The different profiles offered are listed under „hub profile“. If you have any questions about the product, please do not hesitate to contact us via E-Mail or by telephone on +49 (0)40 / 3999 211.
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