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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 4/140 S3.4
Sintered metallic 3.4 mm, rigid version
Compact, free-revving, high load capacity: the four-plate SACHS RCS 4/140 S3.4 uses the small 140 mm diameter to achieve a markedly reduced moment of inertia and short shift windows. This lowers drag torque, speeds up rev build-up and enables precise modulation - ideal for formula series, prototypes and sprint-focused GT setups with tight packaging.
The 3.4 mm sintered lining hits the sweet spot: more thermal capacity and wear reserve than 2.6 mm designs, yet more agile with faster temperature reset than 5.2 mm linings. The bite point remains stable over long stints, engagement stays clean and repeatable - even at high disc temperatures.
This specification transmits up to 1.910 Nm maximum engine torque. A release force of 4,200 N ensures a clear actuation feel, while the system mass of just 3.01 kg supports fast revving and minimal drag torque. The forged aluminium clutch cover (housing) delivers high stiffness at low mass; pressure and intermediate plates made of high-strength steel ensure launch and endurance durability.
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 4/140:
- Maximum engine torque [Nm] : 1.910
- Release diameter [mm] : 38
- Release force [N] : 4.200
- Release travel [mm] : 5.0 +0.5
- Mass (weight) [kg] : 3.64
- Moment of inertia [kgm2] : 0.011585
Clutch cover (housing)
The RCS 140 housing is made from high-strength forged aluminium and engineered for maximum stiffness at minimum weight. The housing geometry supports efficient heat dissipation and stabilises the temperature window of the clutch pack. A wear-resistant hard coating reduces friction and fit wear and increases service life.
Clutch lining - sintered metallic
Sintered metallic linings provide high temperature stability, very good thermal conductivity and fade resistance - ideal for dry high-load use. The 3.4 mm thickness delivers a best-of-both-worlds character: more buffer and life than 2.6 mm, faster temperature reset and lower rotating mass than 5.2 mm. This supports consistent lap times and short pit stop cycles.
SACHS RCS hub
The RCS 4/140 S3.4 racing clutch is available with different hub splines precisely matched to the respective gearbox input shaft. This ensures high fit accuracy, reliable torque transfer and maximum motorsport durability. Hub lengths (short, medium, long) allow optimal packaging and correct actuation. The modular RCS 140 system enables individual tuning for performance, thermal robustness and service life. Standard version of the RCS 4/140 clutch (unless otherwise specified): hub length short-short-short-short
Scope of delivery
RCS 140 clutch cover (HA140), aluminium
1x RCS 140 pressure plate (PP140), steel
3x RCS 140 intermediate plate (IP140), steel
4x RCS 140 clutch disc, sintered 3.4
Hub length: short-short-short-short
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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