Helix 225 mm Damped Cerametalic Clutch Disc for Porsche 911 with 915 Transmission

The Helix Autosport 76-4047 clutch disc is a 225 mm 4/5-paddle performance disc designed for several Porsche 911 models equipped with the 915 transmission. Designed for race and rally use, it combines a cerametalic clutch with a damped hub.

The damped hub is a key difference from the Helix 78-4047 model, which features a rigid hub. The hub’s springs help absorb some of the torque fluctuations transmitted between the engine and the transmission, while maintaining a disc design suitable for sport and competition use.

Part number 76-4047 features a diameter of 225 mm, a thickness of 7.20 mm, and a 22.5 mm groove profile with 20 teeth. Helix recommends it for use 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
• Porsche 911 Carrera 3.2 (1983–1987) – 915 transmission

Before mounting, you must verify the vehicle model and transmission type. The compatibility of this part number depends on the clutch configuration and the 915 transmission specified by Helix.

Technical Specifications

• Brand: Helix Autosport
• Manufacturer Part Number: 76-4047
• Type: Performance 4/5 Paddle Clutch Disc
• Friction material: cermet
• Diameter: 225 mm
• Thickness: 7.20 mm
• Hub: sprung
• Splines: 22.5 mm x 20 teeth
• Transmission: Porsche 915
• Clutch control: Pull type
• Use: Race/Rally