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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 3/140 S3.4
Sintered metallic 3.4 mm, rigid version
Compact and free-revving: the triple-plate SACHS RCS 3/140 S3.4 uses the small 140 mm diameter for low moment of inertia and short shift windows - noticeably quicker rev build-up, reduced drag torque and precise modulation when launching and upshifting. This is advantageous on tight circuits and in formula series, circuit and touring car setups with limited installation space.
The 3.4 mm sintered metallic lining is built for load capacity and consistency: more thermal capacity and wear reserve than 2.6 mm linings, yet more agile with faster temperature reset than 5.2 mm sintered pad discs. The pressure point remains stable over long stints, engagement stays repeatable - even at high disc temperatures.
In this specification the RCS 3/140 S3.4 transmits up to 1.430 Nm maximum engine torque - the triple-plate configuration spreads friction work and temperature across multiple contact surfaces and thus increases torque capacity with a compact stack height. A forged aluminium clutch cover (housing) delivers high stiffness at low mass, while pressure and intermediate plates made from 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 3/140:
- Maximum engine torque [Nm] : 1.430
- Release diameter [mm] : 49 / 38
- Release force [N] : 4.900 / 4.200 (⌀ 38)
- Release travel [mm] : 4.0 +0.5 / 4.5 +0.5
- Mass (weight) [kg] : 2.94 / 3.01 (⌀ 38)
- Moment of inertia [kgm2] : 0.009221 / 0.009230
Clutch cover (housing)
The RCS 140 clutch cover (housing) is made from high-strength forged aluminium. The housing geometry promotes 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 linings provide high temperature resistance, very good thermal conductivity and fade resistance - ideal for dry high-load use. The 3.4 mm thickness delivers a proven compromise of thermal buffer, service life and low rotating mass - ideal for frequent load changes and short pit stop cycles.
SACHS RCS hub
The RCS 3/140 S3.4 is available with different hub splines precisely matched to the respective gearbox input shaft. 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 version of the RCS 4/140 clutch (unless otherwise specified): long-medium-long.
Scope of delivery
RCS 140 clutch cover (HA140), aluminium
1x RCS 140 pressure plate (PP140), steel
2x RCS 140 intermediate plate (IP140), steel
3x RCS 140 clutch disc, sintered 3.4
Hub length: long-medium-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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