The Helix Autosport 78-4047 clutch disc is a 225 mm competition disc designed for several Porsche 911 models equipped with the 915 transmission. This Performance 4/5 Paddle Rigid version features a rigid hub and is intended by Helix for race and rally use.
Unlike the Helix 76-4047 version, which features a damped hub, the 78-4047 model uses a rigid hub. This design transmits torque directly to the drivetrain and is suited for competition use.
The disc has a diameter of 225 mm, a thickness of 7.20 mm, and a 22.5 mm-wide, 20-tooth grooved profile. It is listed by Helix for mounting with a Porsche 915 transmission and a pull-type clutch system.
Compatible vehicles:
- Porsche 911 T/E/S 2.4 (1971–1977) – 915 transmission
- Porsche 911 Carrera 2.7 (1972–1976) – 915 transmission
- Porsche 911 Carrera 3.0 (1975–1977) – 915 transmission
- Porsche 911 SC 3.0 (1977–1979) – 915 transmission
- Porsche 911 SC 3.0 (1980–1983) – 915 transmission
Compatibility must be verified based on the Porsche 911 model and its transmission; part number 78-4047 is specifically intended for the Helix applications listed with the 915 transmission.
Technical Specifications
- Brand: Helix Autosport
- Manufacturer Part Number: 78-4047
- Type: Performance 4/5 Paddle Rigid Clutch Disc
- Diameter: 225 mm
- Thickness: 7.20 mm
- Hub: Rigid
- Splines: 22.5 mm x 20 teeth
- Transmission: Porsche 915
- Clutch control: Pull type
- Use: Race/Rally
