Osculati 47.557.20 – Champion RA8HC Spark Plug
The Osculati 47.557.20 features the Champion RA8HC, a resistor-type spark plug with a projected nose design optimized for clean combustion and ignition reliability. It is ideal for 4-stroke outboard and inboard engines where RFI suppression and stable performance under variable load are critical. Its copper core electrode enhances thermal conductivity and service life in marine environments.
Main Features:
- Model: Champion RA8HC
- Thread Size: 14 mm
- Reach: 19 mm (3/4″)
- Hex Size: 16 mm (5/8″)
- Resistor: Yes – built-in for RFI suppression
- Electrode Type: Projected nose, copper core
- Application: 4-stroke marine engines
- Marine Grade: Yes – corrosion-resistant materials
Benefits:
- Stable ignition and optimal combustion under load
- Suppresses interference with GPS, radios, and other electronics
- Copper core ensures excellent heat dissipation and plug longevity
- Marine-grade durability in salt-heavy, humid environments
Technical Specifications Table:
| Parameter | Value |
|---|---|
| Item Code | 47.557.20 |
| Model | Champion RA8HC |
| Thread Size | 14 mm |
| Reach | 19 mm (3/4″) |
| Hex Size | 16 mm (5/8″) |
| Resistor | Yes |
| Electrode Type | Projected nose, copper core |
| Application | 4-stroke marine engines |
The Osculati 47.557.20 – Champion RA8HC spark plug is engineered for consistent, interference-free ignition in 4-stroke marine engines. With its projected core nose and marine-grade construction, it delivers high combustion efficiency, long life, and clean performance in harsh environments.
